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1	Basic Science Education	ABS-40
DEVELOPMENT OF TEACHING MATERIALS BASED ON PROJECT BASED LEARNING ON ACID BASE THEORY, pH OF SOLUTIONS AND ACID BASE TITRATION IN CLASS XI SCIENCE Muhammad Evan (a*) , Sanjaya (b), Marelin riyayu (c) a : student of faculty of teacher training and eduction, sriwijaya university b: lacture of faculty of teacher training and eduction, sriwijaya university c : chemistry teacher of high school number 6 Palembang Abstract This research is a development research that produces teaching materials based on project-based learning (PjBL) on acid-base theory, pH solutions and acid-base titrations for class XI IPA. The development model used is the Four Steps Teaching Material Development (4S-TMD). Data collection was carried out by interviews, questionnaires, validation and tests. The results of the validation of teaching materials developed from the three aspects material, pedagogic, and design, obtained an average validity score of 0.93 in the high category and declared valid. The practicality test results that have been carried out and analyzed obtain a practicality value of 0.80 where the score is categorized as high so that it is considered practical. The results of the effectiveness test of teaching materials by looking at student learning outcomes based on pretest and posttest scores are then calculated for the N-Gain. The N-Gain score obtained was 0.72 where the score was in the high category range and was declared effective. Thus the project-based learning-based teaching materials that have been developed are stated to be valid, practical and effective so that they are suitable for use in the chemistry learning process for acid-base theory , pH solutions and acid-base titrations in class XI IPA. Keywords: Development Research, Teaching Materials, PjBL, 4S TMD. Share Link | Plain Format | Corresponding Author (Muhammad Evan)

2	Basic Science Education	ABS-47
Analysis Of Scientific Literacy Categories In Chemistry Materials In The Chapter Of Properties Of Substance And Mixture Changes In Class VII Science Textbooks Maftuh Gozali (a*), Jejem Mujamil (b) a) Program study chemistry education of sriwijaya university Abstract Scientific literacy is the ability to be knowledgeable in identifying questions, explaining scientific phenomena, and drawing conclusions based on facts. This analysis was conducted to determine the percentage of scientific literacy in the material properties of substances and changes in mixtures. The type of research used is included in the descriptive qualitative research. The research instrument used in this study is based on the 2018 PISA framework which contains three aspects, namely: knowledge aspect, competency aspect, and context aspect. The dominance of the percentage of occurrences of the scientific literacy aspect indicator was obtained by the scientific knowledge aspect. The indicator of the scientific knowledge aspect gave the largest number of occurrences, namely as much as 74.70%. Meanwhile, the aspect of science context is the indicator that appears the least with a percentage of 8.56%. Meanwhile, the science competency aspect has a total percentage of 16.74%. %, the Aspect of Science Context is 12.12%, while in book Y the percentage of scientific literacy in the Aspect of Science Knowledge is 76.67%, the Aspect of Science Competence is 18.33%, the Aspect of Science Context is 5%. Keywords: Science Literacy, Middle School Textbook, PISA 2018 Framework, Knowledge Aspect, Science Competence Aspect, Science Aspect Share Link | Plain Format | Corresponding Author (Maftuh Gozali)

3	Basic Science Education	ABS-75
Development of Electrochemical Learning Module Based on Project Based Learning for Class XII Students at SMA Negeri 05 Palembang Yunia Arum Hariyanti, Made Sukaryawan Chemistry Education, Faculty of Teacher Training and Education, Sriwijaya University, Palembang Abstract The purpose of this research is to produce a learning module of electrochemistry based on project based learning for XII grade student which is valid, practical, and effective. the development research model used is 4D model, which consist of define, design, develop, and disseminate stage. On development stage conducted Expert Appraisal, Development Testing I, and Development Testing II. The data collection techniques in the form of interviews and questionnaires. On expert appraisal stage obtained the average score of material validity according to Aiken^s coefficient of 0,98 with high category, score of pedagogic validity of 0,98 with high category, and score of design validity of 0,95 with high category. The average score of material, pedagogic, and design validity of 0,97 with high category. On developmental testing I stage obtained the average of practicality score of 0,92 with high category. On developmental testing II stage obtained the average of practicality score of 0,91 with high category, the effectiveness done with N-Gain test, obtained the average score of 0,91 with high category. Based on data that has been obtained shows that a learning module of electrochemistry based on project based learning has fulfilled valid, practical, and effective criteria. Keywords: development research, learning module of electrochemistry, project based learning. Share Link | Plain Format | Corresponding Author (Yunia Arum Hariyanti)

4	Basic Science Education	ABS-76
ANALISIS KEBUTUHAN MAHASISWA TERHADAP BAHAN AJAR EMODUL PADA MATA KULIAH PENGELOLAAN LABORATORIUM KIMIA DI PROGRAM STUDI PENDIDIKAN KIMIA UNIVERSITAS SRIWIJAYA Gierrald Abduch Universitas Sriwijaya Abstract This research was conducted to determine student needs for e-module teaching materials in the chemistry laboratory management course. This research uses a descriptive method. Data collection techniques used questionnaires and interviews using the purposive sampling technique, namely for students who had completed the chemical laboratory management course. The questionnaire used in the study was validated by an expert validator and a sample test was carried out. The results of the sample test carried out the validity test, there were 10 invalid items and the reliability test obtained the result of 0.885. The validated questionnaire was used for data collection and interviews to obtain more information. Based on the results of the study, it was found that 80% of students agreed, 12% of students disagreed and 8% of students doubted that e-module teaching materials were needed in the chemistry laboratory management course, and 97% of students agreed, 0% of students answered that they did not agree and 2% of students doubtful about the need for animation and learning videos in emodules in the chemical laboratory management course. It is recommended to make a chemical laboratory management e-module Keywords: Needs Analysis, E-Module, Management Chemical Laboratory Share Link | Plain Format | Corresponding Author (Gierrald Abduch)

5	Basic Science Education	ABS-87
PENGEMBANGAN LEMBAR KERJA MAHASISWA (LKM) BERBASIS PROBLEM BASED LEARNING (PBL) MATERI ANALISIS KUALITATIF KARBOHIDRAT PADA MAHASISWA Mifthahul Jannah Univesitas Sriwijya Abstract Keywords: Development Research, PBL-based LKM, Carbohydrate Qualitative Analysis Share Link | Plain Format | Corresponding Author (Mifthahul Jannah)

6	Basic Science Education	ABS-88
DEVELOPMENT OF INTERACTIVE MULTIMEDIA FOR LEARNING CHEMISTRY OF COLLOID SYSTEM MATERIALS FOR CLASS XI HIGH SCHOOL Dwilia Julia, Effendi, dan Rodi Edi Sriwijaya University Abstract Interactive multimedia for learning chemistry has been developed and used in the material for colloid system class XI Raudhatul Ulum Indralaya High School. This development was carried out using the ADDIE model modified using Tessmer formative evaluation with stages including analysis, design, development, self evaluation, expert review, one to one, small group, field test. Data collection is done through interviews, questionnaires, tests. The validity of interactive multimedia is validated by material experts with scores obtained 0.81 very valid categories, design experts with a score of 0.94 categories are very valid, pedagogics with a score of 0.86 categories are very valid. The results of the validity score of each expert are used Aiken based calculation formula. The practicality of interactive multimedia is seen from the questionnaire assessment score in the one to one stage with an average score of 0.74 in the very practical category and the small group with an average score of 0.73 categories very practical. The effectiveness of this multimedia is seen from the learning outcomes test in the field test stage which obtained a n-gain score of 0.57 with a medium effectiveness category. The results obtained in this study are interactive multimedia that has met the criteria of valid, practical, and effective learning for chemistry of colloidal system materials. Keywords: Development, Interactive Multimedia , validity, practical and effectiveness. Share Link | Plain Format | Corresponding Author (Dwilia Julia)

7	Basic Science Education	ABS-95
DEVELOPMENT OF STUDENT WORKSHEETS (LKM) BASED ON PROBLEM BASED LEARNING (PBL) QUALITATIVE CARBOHYDRATE ANALYSIS MATERIAL FOR STUDENTS Mifthahul Jannah, Effendi, Diah Kartika Sari Universitas Sriwijaya Abstract Keywords: Development Research, PBL-based LKM, Carbohydrate Qualitative Analysis Share Link | Plain Format | Corresponding Author (Mifthahul Jannah)

8	Biology and Applied Biology	ABS-9
Biodiversity of Cellulolytic Bacteria from Termite Gut Isolated from Bengkulu Coastal Area Dwita Oktiarni (1,2*) and Lusiana(1) (1) Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Bengkulu, Jalan W.R.Supratman, Kandang Limun, Kota Bengkulu, 38122, Indonesia. *dwita.oktiarni[at]unib.ac.id (2) Research Center of Sumatera Natural Products and Functional Materials, Universitas Bengkulu, Jalan W.R.Supratman, Kandang Limun, Kota Bengkulu, 38122, Indonesia. Abstract The termite from Bengkulu coastal area was classified as a high-level termite. Termites, being highly social insects, break down cellulosic biomass into glucose using bacteria that produce cellulolytic enzymes in their guts. Identification of the new species of cellulolytic bacteria from temite was performed by biomolecular assay. The bacteria isolates were isolated and purified by using DNA kit and the optical density of bacterial DNA isolates was carried out by using nanodrop spectrophotometer. The isolated bacterial strains were amplified by PCR to determine the 16S rRNA gene segment, performed using BLAST-N program and compared with NCBI database. Keywords: biomass, cellulolytic bacteria, cellulose, termite Share Link | Plain Format | Corresponding Author (Dwita Oktiarni)

9	Biology and Applied Biology	ABS-20
Antioxidant and Antibacterial Activities of Ethyl Acetate Extract of Endophytic Fungi Isolated from Ciplukan (Physalis angulata L.) Fruit Budi Eko Wahyudi1, Elfita2*, Hary Widjajanti3, Salni3 1 Postgraduate School of Sciences, Faculty of Mathematics and Natural Sciences, Sriwijaya University. Jl. Padang Selasa No. 524, Palembang 30129, South Sumatra, Indonesia 2 Department of Chemistry, Faculty of Mathematics and Natural Sciences, Sriwijaya University. Jl. Raya Palembang-Prabumulih Km 32, Indralaya, Ogan Ilir 30662, South Sumatera, Indonesia. 3 Department of Biology, Faculty of Mathematics & Natural Sciences, Sriwijaya University. Jl. Raya Palembang-Prabumulih Km 32, Indralaya, Ogan Ilir 30662, South Sumatera, Indonesia. Abstract Physalis angulata L. well known traditionally in treating various diseases caused by free radicals and bacterial infections. Endophytic fungi in P. angulata L. plants are of concern because they have the potential to be developed as an alternative for providing medicines. This study aims to identify morphological characters and investigate the antioxidant and antibacterial activity of ethyl acetate extract of endophytic fungi from P. angulata L fruit and compare it with the host plant. Identification of fungal morphology based on macroscopic and microscopic characters. Antioxidant activity was tested using the DPPH method and antibacterial activity was tested using the Kirby-Bauer diffusion method. The results of the isolation of endophytic fungi from P. angulata L. fruit resulted in 2 isolates, namely CH1 and CH2. Based on macroscopic and microscopic characters, isolate CH1 was identified as Fusarium sp. and isolate CH2 was identified as Pythium sp. The endophytic fungal isolate was then cultivated to obtain ethyl acetate extract. The antioxidant activity of the isolated endophytic fungus ethyl acetate extract was weaker than the host plant, while the antibacterial activity was stronger than the host plant. This research shows that endophytic fungi isolated from P. angulata L. fruit have the potential to be developed into medicinal ingredients to treat free radicals and bacterial infections. Keywords: Endophytic fungi, Physalis angulata L., antioxidant, antibacterial Share Link | Plain Format | Corresponding Author (Budi Eko Wahyudi)

10	Biology and Applied Biology	ABS-42
Mega Transect Survey to Estimate Population of Silvery Lutung Trachypithecus Cristatus in Banyuasin River, South Sumatra Muhammad Iqbal1, Arum Setiawan2*, Pormansyah3, Indra Yustian2 1Department of Biology, Faculty of Computer and Science Universitas Indo Global Mandiri, Palembang, Sumatera Selatan 30129, Indonesia 2Department of Biology, Faculty of Science, Sriwijaya University, Jalan Raya Palembang-Prabumulih km 32, Indralaya, Sumatera Selatan 30662, Indonesia. 2Conservation Biology Program, Faculty of Science, Sriwijaya University, Jalan Padang Selasa 524, Palembang, Sumatera Selatan 30139, Indonesia. Abstract Silvery Lutung, Trachypithecus cristatus is recently listed Vulnerable primate based on the assumption of the extensive habitat loss from forest fires and clearance for oil palm plantations and hunting for pet trade that has taken place within the range of the species, there has been a suspected decline probably at a rate of more than 30% over the past three generations (approximately 36 years). To review local status of this Vulnerable primate, we conduct a mega transect survey on 7 October 2023, to assess the populatons on T. cristatus along 50 km of Banyuasin River, South Sumatra Province, Indonesia. We use direct observation to census all individuals of T. cristatus. Our survey found a total of c. 500 individuals of T. cristatus were documented in Banyuasin River. Based on the survey coverage, it is presumed that the population of M. fascicularis in this area could reach 1.000 individuals. Although having high population, it was not confirmed if this primate has become a pest for the major crops of local people. In addition, no indication of hunting or observation of local people who keep T. cristatus as a pet. Our survey suggests T. cristatus is the most common primate in riverine coastal zone habitats of Banyuasin River, South Sumatra. Keywords: Vulnerable, population, Silvery Lutung, Trachypithecus cristatus, Sumatra. Share Link | Plain Format | Corresponding Author (Muhammad Iqbal)

11	Biology and Applied Biology	ABS-81
OPTIMIZATION OF CELLULASE PRODUCTION BY Chaetomium globosum 17BDSM USING SOLID PHASE FERMENTATION METHOD WITH BAGASSE, RICE STRAW AND CORN COBS Elisa Nurnawati, Rasti Puspha Amrina Rosyada, Muharni, Hary Widjajanti Department of Biology, Faculty of Mathematics and Natural Science, Sriwijaya University Abstract Cellulose is still present in agricultural by-products, although it hasn^t been fully utilised yet. Fungi and bacteria are examples of microorganisms that can manufacture cellulase enzymes. The fungus Chaetomium globosum 17BDSM possesses cellulolytic properties. The following variables affect cellulase activity: pH, temperature, thickness, and substrate. The goal of this research is to determine the ideal substrate thickness, pH, and temperature in order to maximise C. globosum 17BDSM^s growth function and produce high-activity cellulase. This study treated substrate type, temperature, pH, and substrate thickness using a factorial Randomised Block Design (RAK) experimental design. Based on the research results, cellulase activity is impacted by the thickness treatment- at 1.5 cm of thickness, cellulase activity is 0.153981U/mL. Cellulase activity was influenced by the kind of substrate treatment, specifically sugarcane bagasse and corncob substrates, which had respective cellulase activity values of 0.321773 U/mL and 0.039816 U/mL. Treatments with pH and temperature had no effect on cellulase activity. Keywords: Cellulase, Chaetomium globosum, optimization Share Link | Plain Format | Corresponding Author (Elisa Nurnawati)

12	Biology and Applied Biology	ABS-94
Biomass Production of Marine Microalgae as Feedstock for Bioenergy in Synthetic Urea Wastewatere Just Try to Submit This Sample Abstract Gusti Diansyah (a,b*) Riris Aryawati (a), M. Akbar Rahman (c), Lisya Meidina (a), Karin Miranda Pasya (a), Tengku Zia Ulqodry (a) a)Department of Marine Science, Faculty of Mathematics and Natural Sciences, Universitas Sriwijaya, Ogan Ilir 30662, South Sumatra, Indonesia *gusti.diansyah[at]unsri.ac.id b)Doctoral Program of Environmental Science, Graduate Program, Universitas Sriwijaya, Palembang 30139, South Sumatra, Indonesia c)Environmental Management Study Program, Graduate Program, Universitas Sriwijaya, Palembang 30139, South Sumatra, Indonesia Abstract Agricultural and industrial activities have contributed to urea effluent emissions that potentially cause pollution of the marine environment. This study focused on the growth rate of marine microalgae (Porphyridium sp., Nannochloropsis oculata, and Tetraselmis chuii) in utilising urea wastewater as nutrients as well as a bioremediation agent for nitrogen waste reduction. Microalgae were cultivated in a controlled environment with varying concentrations of urea wastewater. The urea concentrations used were 25, 50, 75, 100, 150 ppm and 0 ppm as control variables. Environmental parameters such as pH, temperature, dissolved oxygen (DO) and salinity were also monitored during the experiment. The results showed that the microalgae cell growth rate of Nannochloropsis oculata was 0.45 cells/mL/day. While Porphyridium sp. and Tetraselmis chuii were found to be 0.61 cells/mL/day and 0.56 cells/mL/day. The optimum biomass productivity of microalgae Nannochloropsis oculata, Porphyridium sp. and Tetraselmis chuii was found to be 422.4 gr/m3 per day, 940 gr/m3 per day, and 829.6 gr/m3 per day, respectively. The use of microalgae is a sustainable solution to the negative impact of urea that pollutes marine waters. Keywords: Biomass, Microalgae, Growth rate, Urea Share Link | Plain Format | Corresponding Author (Gusti Diansyah)

13	Chemistry and Applied Chemistry	ABS-8
Pigment characterisation in Buton Island rock art: a review of modern instrumental methods of analysis Evi Maryanti (a*), Irfan Gustian (a), Elfi Yuliza (b), Chatree Saiyasombat (c), Adhi Agus Oktaviana (d,e), Moh Mua^lliful Ilmi (f) (a) Department of Chemistry, Bengkulu University *evi.maryanti[at]unib.ac.id (b) Department of Physics, Bengkulu University (c) Synchrotron Light Research Institute, Nakhon Ratchasima, Thailand (d) Griffith University, Griffith Centre for Social and Cultural Research, Brisbane, Australia (e) BRIN, OR Arkeologi, Bahasa dan Sastra, Jakarta, Indonesia (f) Department of Chemistry, Surabaya State University Abstract Eastern Indonesia is known as an area with a wealth of prehistoric rock art sites, including the Sulawesi archipelago. In the Maros-Pangkep site area, South Sulawesi, rock images were found that were 43.9 thousand years old and are known to be the oldest rock images of hunting scenes in the world. Many rock art images of animals and handprints were also found, known to be 20-30 thousand years old. Buton Island is one of the islands in Southeast Sulawesi Province, which is also suspected of having a prehistoric rock art site. However, research regarding rock drawing pigments on the Buton Island site has yet to be reported. Modern instrumental methods that combine diffraction and spectroscopic techniques were used to investigate the red pigment of rock art taken from the Waburi and Wantopi niches, South Buton. Analysis of chemical elements and components of the pigment material using a Raman spectrophotometer and XRF shows hematite as the main mineral in the pigment material. Structural analysis using synchrotron-based X-ray diffraction and XANES shows the crystal phase of the hematite compound (Fe2O3) with octahedral symmetry. The combination of several modern instrumental methods has provided information on the pigment materials^ chemical properties. It also provides an overview of the application and development of technology that can be used to investigate cultural heritage objects Keywords: Rock art- hematite- Buton- synchrotron- XANES Share Link | Plain Format | Corresponding Author (Evi Maryanti)

14	Chemistry and Applied Chemistry	ABS-11
Comparative Study on Corrosion Inhibition Activity of Nitrogen Compounds Derived from Palm Oil using Two Different Ctalysts Laila Hidayah (a), Ilim (b*), Rifdah Kamilah (c), Kamisah Delilawati Pandiangan (b), and Wasinton Simanjuntak (b) a) Graduate Student of Department of Chemistry b) Department of Chemistry *ilim[at]fmipa.unila.ac.id c) Student of Department of Chemistry Faculty of Mathematics and Natural Sciences, the University of Lampung, Jl. S. Brojonegoro No 1 Bandarlampung, 35145 Indonesia Abstract This research was carried out to obtain palm oil-derived nitrogen compounds through two step reaction procedure and application of the resulting compounds corrosion inhibitors for mild steel in a 3% NaCl solution saturated with CO2. The first step of the reaction was the conversion of palm oil into methyl esters through transesterification reaction using a zeolite-A catalyst. The second step was the conversion of methyl ester into nitrogen compounds by reacting the methyl esters with diethanolamine using two different catalysts, namely zeolite-A and sodium methoxide (NaOCH3), and carried out in a hydrothermal autoclave reactor at a temperature of 80 C with a reaction time of 48 hours. The use of zeolite-A and autoclave is a novelty of this research in the production of nitrogen compounds from vegetable oils, since this method has not been reported in previous research. The experimental results showed that the fatty acids in palm oil were completely converted into methyl esters as proven by GC-MS analysis. GC-MS analysis also showed the formation of nitrogen compounds with a relative percentage of 17.96% in the reaction product using the zeolite-A as a catalyst, and 4.18% in the product obtained using the NaOCH3 as a catalyst. Corrosion experiments using the Wheel test method showed that the use of 150 ppm of the products was able to provide an inhibition efficiency of 84.15% by the product produced with the use of zeolite-A, and 63.60% by products with the use of NaOCH3. The activity of the resulting compounds as corrosion inhibitor was also supported by SEM results which show that the sample surface is well protected. Keywords: Nitrogen compounds- palm oil- zeolite-A- sodium methoxide- corrosion inhibitor- mild steel- corrosive medium Share Link | Plain Format | Corresponding Author (Laila Hidayah)

15	Chemistry and Applied Chemistry	ABS-12
Optimization of Reaction Time on The Conversion of Palm Oil Derivative Methyl Ester Into A Nitrogen Compound using Zeolite-A Catalyst and Its Activity Test As A Corrosion Inhibitor for Mild Steel In A Corrosive Medium Saturated With CO2 Ilim (a*), Laila Hidayah (b), Rifdah Kamilah (c), Kamisah Delilawati Pandiangan (a), and Wasinton Simanjuntak (a) a) Department of Chemistry *ilim[at]fmipa.unila.ac.id b) Graduate Student of Department of Chemistry c) Student of Department of Chemistry Faculty of Mathematics and Natural Sciences, the University of Lampung, Jl. S. Brojonegoro No 1 Bandarlampung, 35145 Indonesia Abstract In this research, optimization of the conversion of palm oil derivative methyl esters into nitrogen compounds was carried out using a zeolite-A catalyst. The amidation reaction was carried out in an autoclave reactor at a constant temperature of 100 C with a reaction time of (24, 48, 72, 96) hours with a stirring time of 30 minutes. The use of zeolite-A and autoclave for the amidation reaction is a novelty in this study. The amidation product was characterized by FTIR and GCMS, then used as a corrosion inhibitor for mild steel in a corrosive medium saturated with CO2 using the wheel test method and the surface morphology of the steel samples was characterized by SEM. The FTIR spectra results show that the amidation products are different from methyl ester, the wave number 1744 cm-1 is the stretching of the C=O ester which has been converted into an amide group in the amidation product which is indicated by the presence of C=O amide vibrations at the wave number 1617 cm-1 and the presence of C-N vibrations at wave numbers 1118 cm-1 and 1051 cm-1. The resulting amidation product still contains diethanolamine compounds which have not finished reacting, as indicated by the presence of O-H vibrations at a wave number of 3298 cm-1. The results of GC-MS analysis show that the amidation product contains nitrogen compounds at time variations of 24, 48, 72, and 96 hours, namely 30.35%, 13.70%, 35.41%, and 47.03%, respectively. Testing the inhibitory activity of nitrogen compounds using a wheel test with 4 variations in reaction time obtained percentage protection of 89.34%, 90.44%, 92.77% and 95.17% respectively. This is also supported by the results of surface morphology analysis using SEM, the amidation product which was synthesized with a reaction time of 96 hours and a stirring time of 30 minutes and produced 47.03% nitrogen compounds with 95.17% protection had the smoothest surface. Based on the results obtained, it shows that nitrogen compounds derived from palm oil hav Keywords: Palm oil methyl ester- zeolite-A- amidation- nitrogen compounds- corrosion inhibitors Share Link | Plain Format | Corresponding Author (Laila Hidayah)

16	Chemistry and Applied Chemistry	ABS-13
Electrochemical Disinfection of Escherichia Coli in Hospital Wastewater Dewi Indira (a*), Wasinton Simanjuntak (b), Yandri (b), Tugiono (c), Sudibyo Abdullah (d), Nurhudawati Ningsih (e) a) Postgraduate Doctoral Program, Department of Environmental Sciences, University of Lampung *dewi.indira[at]ymail.com b) Postgraduate Chemistry, FMIPA, University of Lampung c) Postgraduate, Department of Environmental Sciences, University of Lampung d) National Research Agency, Tanjung Bintang, South Lampung e) Master of Chemistry, Faculty of Mathematics and Natural Sciences, University of Lampung Abstract This research was conducted to study the use of electrohemical treatment for disinfection of Escherichia coli (E-coli) in hospital wastewater, with the main purpose to evaluate the effect of electrochemical potentials and contact time. A series of experiments were undertaken in an electrochemical reactor with two graphite rods as cathode and two aluminium rods as anode. With respect to the purpose of the study, experiments were conducted by aplying varied elctrochemical potentials of 5, 10, and 15 Volts and contact times of 30, 60, 90, and 120 minutes. The experimental results showed that both potential and conatct time have significant effect, and 97.6% percent of the E-coli was successfully inactivated by using a potential of 15 volts and contact time of 120 minutes. This performance implies that electrochemical disinfection has a promising potential as an alterantive chemical dsisinfection , which remain as the main methods applied today. Keywords: Hospital waste water- Esherichia coli- electrochemical disinfection- potential- contact time Share Link | Plain Format | Corresponding Author (Laila Hidayah)

17	Chemistry and Applied Chemistry	ABS-17
Green synthesis of Fe3O4 magnetic nanoparticle by Moringa oleifera leaf extract for photocatalytic of Conge red dye Fahma Riyanti1,2*, Fitria Nursari2, Bijak Riyandi Ahadito2, Laila Hanum3, Eliza2 and Poedji Loekitowati Hariani1,2 1Research Group on Magnetic Materials, Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Sriwijaya, Ogan Ilir 30662, Indonesia 2Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Sriwijaya, Ogan Ilir 30662, Indonesia 2Department of Biology, Faculty of Mathematics and Natural Sciences, Universitas Sriwijaya, Ogan Ilir 30662, Indonesia Abstract Natural water resources can be contaminated if industrial waste is inadequately treated. The uncontrolled release of dangerous organic compounds poses a serious environmental risk. Before wastewater may be discharged into the environment, it must be processed properly. The green synthesis method, Moringa oleifera leaf extract, was used in this study to product Fe3O4 (magnetite). The green synthesis method is an environmentally friendly, cost-effective, low-toxicity, and simple method. Following that, Fe3O4 was used to photodegrade Congo red dye. XRD, SEM-EDX, VSM, UV-Vis DRS, and FTIR were used to characterize Fe3O4 products. pH of the solution, dye concentration, and irradiation time are photodegradation variables. The inclusion of Moringa oleifera leaf extract revealed that it contains flavonoids, terpenoids, alkaloids, and phenolic acids, which act as capping agents to prevent Fe3O4 aggregation. The resulting Fe3O4 is magnetic, with a saturation magnetization value of 80.25 emu/g and a band gap energy of 1.42 eV. At a solution pH of 3, Congo red concentration of 50 mg/L, and an irradiation time of 30 minutes, the photodegradation effectiveness was 95.88%. After five consecutive reuse cycles, Fe3O4 shows outstanding photostability. According to the findings of this study, Fe3O4 is particularly promising for processing dye-containing waste. Keywords: green synthesis, Fe3O4, photodegradation, Congo red Share Link | Plain Format | Corresponding Author (Fahma Riyanti Riyanti)

18	Chemistry and Applied Chemistry	ABS-18
Esterification of Fatty Acid Catalyzed by Ga2O3-Impregnated Sulfated Zirconia Mesopore Bijak Riyandi Ahadito, Zelyka Ananda Putri, Nova Yuliasari, Ady Mara, Desnelli, Addy Rachmat(*) Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Sriwijaya Abstract Heterogeneous catalysts are considered as valuable materials in enhancing many chemical reactions to obtain specific products. Solid acid catalyst such as sulfated zirconia (SZ) is a promising catalyst with morphology and acidity properties that can be tuned up. Our group previously reported the successful modification of sulfated zirconia by 2, 5, and 10% (wt) $Ga_{2}O_{3}$ (xGa-SZ- x = 2, 5, and 10) via template-assisted sol-gel method as characterized by powder XRD, surface analyses using SEM-EDS and gas sorption analysis, and acidity evaluation using gravimetric method. In this research, we utilize the modified sulfated zirconia as catalyst for the esterification of lauric acid. 5Ga-SZ and 10Ga-SZ were found to be able to catalyze the esterification of lauric acid into methyl laurate as detected by GC-MS. The solid acid xGa-SZ has potential performance as heterogeneous catalyst for biodiesel production. Keywords: Sulfated zirconia, gallium oxide, solid acid catalyst, esterification Share Link | Plain Format | Corresponding Author (Bijak Riyandi Ahadito)

19	Chemistry and Applied Chemistry	ABS-21
Ethanolic Extract of Guava Seed Leaves (Psidium guajava L.) as Media for Biosynthesis of ZnO/CuO Nanoparticles : Characterization and In Vitro Study to Staphylococcus aureus Bacteria Ahmad Fatoni a,*, Khoirunnisa Sari b, Lasmaryna Sirumapea a and Nurlisa Hidayati c aPharmaceutical Chemistry, Bhakti Pertiwi High School of Pharmacy Science, Palembang, South Sumatera Indonesia 30128 bUndergraduate of Bhakti Pertiwi High School of Pharmacy Science, Palembang, South Sumatera Indonesia 30128 cDepartment of Chemistry, Faculty of Mathematic and Natural Sciences, Sriwijaya University, Indralaya Ogan Ilir South Sumatera, Indonesia Abstract Research was done on ZnO/CuO nanoparticle biosynthesis. The objective of this study was to synthesize ZnO/CuO nanoparticles, characterize them, and use them as an antibacterial agent against Staphylococcus aureus. The media of ethanolic extract of guava seed leaves (Psidium guajava L.) in alkaline solution were used to biosynthesize ZnO/CuO nanoparticles. The tools used to examine the functional groups and physical structure of ZnO/CuO nanoparticles include FTIR spectroscopy and X-ray diffraction. Using the well agar diffusion method, ZnO/CuO nanoparticle suspension was used as an antibacterial agent. Wavenumbers for the Zn-O and Cu-O groups at ZnO/CuO nanoparticles are 507.28 and 617.22 cm-1, respectively. ZnO/CuO nanoparticles^ crystallite size was calculated to be 2.33 nm. Staphylococcus aureus may be resistant to the ZnO/CuO nanoparticles^ antimicrobial effects. ZnO/CuO nanoparticles have a greater inhibitory zone than ZnO or CuO nanoparticles. Keywords: ZnO/CuO nanoparticles- characterization- antibacterial Share Link | Plain Format | Corresponding Author (Ahmad Fatoni)

20	Chemistry and Applied Chemistry	ABS-24
Synthesis of Graphene Oxide-intercalated Bentonite Composites And its Application for removal of Methylene Blue Dyes Muhammad Said, David Fernando, Della Silvia, Suheryanto, Elisa Nurnawati, Bayu Mahdi Kartika Universitas Sriwijaya Abstract Research has been conducted on synthesizing bentonite/GO composites for application to reduce methylene blue dye by adsorption method. GO synthesis uses a modified hummer method to avoid the use of toxic compounds. In characterization using XRD, GO is obtained with peaks at an angle of 10.57and in bentonite there are several peaks, namely 22.10, 28.1 , 35.63. For bentonite/GO composites the best is found at a ratio of 1:3 with a peak at 25.61. In characterization using SEM EDX, the morphology of bentonite/GO is seen where in the pores of bentonite there is GO that fills the gap in bentonite which has a porous structure. Based on the EDX results on the GO bentonite composite, there was also a very large increase in carbon atoms. The removal of methylene blue dye has been successfully proven with the best adsorption capacity found at a contact time of 60 minutes with a percentage of 89,83% and Qe value of 9.5 mg/g and the maximum concentration of this composite can adsorp at a concentration of 35 mg / L with a percentage of 97,83 and Qe value of 10.272 mg/g. Keywords: Bentonie, Graphene Oxide, Adsorption, Methylene Blue Share Link | Plain Format | Corresponding Author (Muhammad Said)

21	Chemistry and Applied Chemistry	ABS-34
SUNGKAI (Peronema canescens JACK) LEAF METHANOL EXTRACT FOR PROLIFERATION OF Saccharomyces cerevisiae YEAST AND MICE (Mus muculus) MICE Irena Francina Kelly Kamal (a*)- Hermansyah Hermansyah (a)- Desnelli Desnelli (a)- Muharni Muharni (a)- Yosie Andriani (b) a) Department of Chemistry, Faculty of Mathematics and Natural Science, Universitas Sriwijaya, Jalan Raya Palembang Prabumulih, Ogan Ilir, Sumatera Selatan *08031381924100[at]student.unsri.ac.id or kellylily101201[at]gmail.com b) Institute of Marine Biotechnology, Universiti Malaysia Terengganu Abstract Sungkai (Peronema canescens Jack.) is one of woody plants which is usually found in the Southern part of Sumatra which is often used as an herbal plant by people for flu, toothache, and bathwater for postpartum mothers. This research was aimed to know immunomodulator potency of Sungkai in mice (Mus muculus) and effect extract to proliferation of Saccharomyces cerevisiae yeast and leukocytes. Yeast proliferation is associated with cancer cells while leukocytes assay is associated closely with immunostimulatory activity. Sungkai leaf was macerated using methanol then evaporated and tested for its phytochemistry profile and thin layer chromatography. Several groups were detected in phytochemistry profiling, such as terpene, steroid, alkaloid, saponin, and flavone. For the leukocytes assay of the extract, mice (Mus musculus) were used. There were several variables, positive control (Stimuno), negative control (CMC-Na), 5% concentration, 10% concentration, and 15% concentration. Mice leukocytes were taken from tail biopsy and counted under haemocytometer and microscope. 15% concentration extract results in the highest content of leukocytes found in the mice tail which was 9560 units, while negative control results in the lowest content of leukocytes which was 5250 units. This indicated that sungkai extract has potency as immunomodulator. This extract was then tested for its proliferation activity of S. cerevisiae yeast growth by adding some extract of various concentrations, 5%, 10%, 15%, and 20%, to yeast culture broth. Based on optical density observation using spectrophotometer UV-Vis (&#955- = 660 nm) show that there was no significant difference cell growth among in the absence and in the presence of various concentrations of extract. This indicated that sungkai has no effect for the proliferation of S.cerevisiae cell. Keywords: sungkai, proliferation, leukocytes, immunomodulator Share Link | Plain Format | Corresponding Author (Irena Francina Kelly Kamal)

22	Chemistry and Applied Chemistry	ABS-41
The Isolation Of Phloroglucinol Derivative Compound From Ethyl Acetate Karamunting Fruit (Rhodomyrtus Tomentosa) And Test For The Inhibition Activity Of Alfa-Glucosidase Enzyme Daniel Alfarado, Ferlinahayati, Eliza Department of Chemistry, Faculty of Mathematics and Natural Sciences, Sriwijaya University, Jalan PalembangPrabumulih Km 32 Indralaya, Ogan Ilir, Indonesia, 30662 Abstract Diabetic mellitus (DM) is a disease with hyperglycemia condition. One of the DM treatment is to inhibit the Alfa-glucosidase enzyme activity. Some of plant have been reported as inhibitor of Alfa-glucosidase enzyme. Karamunting (Rhodomyrtus tomentosa) has been reported to have a variety of activities such as antioxidant, antibacterial, anticancer and antiinflamatory, however there is no report about the ablility karamunting to inhibit the Alfa-glucosidase enzyme activity. According to that the research was conducted to isolate the chemical compound and determine the ability of Karamunting plant as well as the isolate compound to inhibit the activity of Alfa-glucosidase enzyme from extract, fraction and product of isolation. The extraction process was done by maceration using methanol, and then continued with liquid-liquid fractionation using n-hexane, ethyl acetate and n-butanol. Separation and purification of ethyl acetate fraction was conducted by vacuum liquid chromatography and radial chromatography. The isolate compound was a brownish white solid (19 mg) which decomposes at 85 C. Based on spectrum analysis UV, IR, 1H-NMR, 13C-NMR, HSQC, HMBC and the comparison with the literature, it was concluded the isolated compound is phloroglucinol derivative namely isovaleroyl phloroglucinol. The IC50 of Alfa-glucosidase enzyme activities from methanol extract, ethyl acetate fraction, n-butanol fraction and the isolate compound are 13,7- 9,04- 13,82- and 51,81 ppm respectively. Those extract and fractions have inhibition ability stronger than the reference inhibitor, acarbose (IC50 75,25 ppm). n-hexane fraction with IC50 value 727,96 ppm give weaker inhibition for Alfa-glucosidase enzyme than acarbose. From this research, we can conclude that karamunting plant have an ability to inhibit the enzyme Alfa-glucosidase activity. Keywords: Rhodomyrtus tomentosa, phloroglucinol derivative compound, isovaleroyl phloroglucinol, Alfa-glucosidase enzymes Share Link | Plain Format | Corresponding Author (Daniel Alfarado)

23	Chemistry and Applied Chemistry	ABS-54
LOOPING SYSTEM APPLICATION IN UTILIZING RESIDUAL CO2 FROM CONVERSION CO2 TO METHANOL AND METHANOL PURIFICATION THROUGH CONTINUOUS DISTILATION Yollanda Nurcholifah (a), Dedi Rohendi (a,b*), Nirwan Syarif (a,b), Dwi Hawa Yulianti (c), Nyimas Febrika S. (c), Icha Amelia (c) a) Universitas Sriwijaya, Faculty of Mathematic and Natural Sciences, Department of Chemistry, Jl. Palembang-Prabumulih Km 32, Indralaya, Ogan Ilir 30862, Indonesia b) Univesitas Sriwijaya, Center of Research Excellent in Fuel Cell and Hydrogen, Jl. Srijaya Negara, Palembang 30128, Indonesia rohendi19[at]unsri.ac.id c) Universitas Indo Global Mandiri, Chemistry Program, Faculty of Computer and Science, Jalan Jenderal Sudirman No. 629, Palembang, 30129, Indonesia Abstract CO2 conversion can produce compounds that can be used as raw materials and fuels, such as methanol. Not all of the supplied CO2 gas can be converted to methanol, but there is residual CO2 that is not converted. The Looping system method is used to utilize unconverted residual CO2 so that it can be reused in the system to produce methanol. CO2 gas is supplied by freeing gas flow to MFC (Mass Flow Controller) 1, then flowed to MFC 2 with a flow rate of 480 mL/minute at a voltage of 1.8 V. The residual CO2 flows back to MFC 3 with the help of a peristaltic pump. The residual CO2 returned to the system will help reduce the CO2 supply. It is known from MFC 1 which shows a decrease in flow rate. The methanol product produced on the cathode side was purified by continuous distillation method and concentration of methanol was measured using the Methanol Analyser Analox AM5. The operation of CO2 conversion with a looping system on a multi-stack electrolyzer is carried out in parallel circuits using varying operating times, namely for 2, 4, 6, and 8 hours. The percentage value of the converted CO2 efficiency and the CO2 flow rate from the inlet tube did not change significantly at various operating times with the highest converted CO2 efficiency percentage values being at 2 and 6 hours of operation, amounting to 83.333% and the lowest MFC1 input CO2 flow rate at 4 hours of operation hour by 434 mL/minute. Currents that tend to be stable are at 2 hours of operating time, starting with an electric current of 0.32 A and ending at a current of 0.33 A. The highest percentage of methanol from the conversion before distillation and after distillation is at 2 hours of operation, that is, respectively percentages of 7.83 and 63.850 % (w/v). Keywords: Methanol Analyser, Looping System, Mass Flow Controller, Electrolyzer Multi-Stack, CO2 Conversion Share Link | Plain Format | Corresponding Author (Yollanda Nurcholifah)

24	Chemistry and Applied Chemistry	ABS-83
Valorization of Oil Palm Empty Fruit Bunch through Effectively Pretreatment and Hydrolysis of Lignocellulosic Biomass Rodi Edi, Hermansyah Hermansyah, Zainal Fanani, Addy Rachmat, Hartono Hartono, Gusti Diansyah 1Doctoral Program of Mathematics and Natural Sciences, Graduate Program, Universitas Sriwijaya. Jl. Palembang-Prabumulih Km. 32, Indralaya, Ogan Ilir 30662, South Sumatra, Indonesia. Tel.: +62-711-580269 ext. 580056, Fax.: +62-711-580056 2Chemistry Dept., Faculty of Mathematics and Natural Sciences, Universitas Sriwijaya, Jalan Raya Palembang Prabumulih KM32, Indralaya 30662, South Sumatra, Indonesia 3Chemical Education Study Program, Faculty of Teacher Training and Education, Universitas Sriwijaya, Jalan Raya Palembang Prabumulih KM32, Indralaya 30662, South Sumatra, Indonesia 4Doctoral Program of Environmental Science, Graduate Program, Universitas Sriwijaya. Jl. Padang Selasa No.524, Bukit Besar, Palembang 30139, South Sumatra, Indonesia Abstract Lignocellulosic Biomass represents one of the most abundant and sustainable carbon sources available on Earth. The abundance of lignocellulose biomass such as oil palm empty fruit bunch (OPEFB) waste can be a big problem for the environment. Lignocellulose is a complex structure consisting of a robust lignin and hemicellulose matrix that surrounds cellulose molecules. The remaining portion of lignocellulosic biomass comprises extractives such as oils, ash, and proteins. Lignocellulosic materials possess significant biotechnological value due to the chemical properties of their constituents. These lignocellulosic resources are rich in energy compounds and can serve as raw materials across various industries. Bioconversion processes targeting specific components within lignocellulosic waste have been employed in biorefining to generate a wide array of bio-based products. Sugar fermentation transforms lignocellulosic constituents into biofuels and various bioproducts. Sugar fermentation transforms lignocellulosic constituents into biofuels and various bioproducts. Conversely, syngas or thermochemical conversion processes convert biomass into valuable substrates for subsequent fermentation processes. This diverse array of bioconversion techniques yields products that include organic acids, biopolymers, proteins, biofertilizers, composites, industrial enzymes, and biofuels. Effectively initial processes which is pretreatment and hydrolysis of OPEFB plays an essential role for bioconversion process. Keywords: lignocellulose, pretreatment, hydrolysis, OPEFB Share Link | Plain Format | Corresponding Author (Rodi Edi)

25	Chemistry and Applied Chemistry	ABS-91
Antibacterial Activity of Semprawang (Dillenia ochreata) Leaves and Stem Bark Against Escherichia coli and Staphylococcus aureus Restri Diah Carissa Chemistry Faculty Mathematics and Natural Science, Sriwijaya University Abstract Semprawang (Dillenia ochreata) is one of the traditional medicinal plants of the Dilleniaceae family for wound treatment. It is known that the chemical content and biological activity of the D. ochreata plant is still very limited. The aims of this study were determine the antibacterial activity of the total methanol extract and the fractions (n-hexane, ethyl acetate and methanol) from the leaves and stem bark of D. ochreata. The antibacterial activity on E. coli and S. aureus bacteria was carried out by diffusion method and followed by determination of minimum inhibitory concentration (MIC) by liquid dilution method. Extraction process was conducted using maceration method with methanol as solvent and to obtained fraction using maceration with step grader priority (n-hexane, ethyl acetate and methanol). This research showed that the total methanol extract of semprawang leaves was more active than the steam bark methanol extract against both E. coli and S. aureus bacteria with the diameter of inhibition zone at 8.87 mm and 7.35 mm respectively. The MIC value for each total extract and stem bark and leaf fraction of D. ochreata up to a test concentration of 125 &#956-g/mL showed that only the n-hexane fraction against E. coli and S. aureus had the highest difference in MIC values of 75 &#956-g/mL and 125 &#956-g/mL respectively. The MBC test, only D. ochreata stem bark of n-hexane fraction against E.coli bacteria were able to provide bactericidal with a MBC value of 125 &#956-g/mL. Keywords: Antibacterial, Dillenia ochreata, Leave, Stem bark, E. coli, S.aureus Share Link | Plain Format | Corresponding Author (Restri Diah Carissa)

26	Environmental Sciences	ABS-28
What is Sustainable ? literature and empirical palm oil certification Dedi Kusuma Habibie (a,b*),Muhadjir Darwin (a), Suharko (a) a) Faculty of Social Science and Political Science, Universitas Gadjah Mada, Indonesia b) Faculty of Social Science and Political Science, University of Riau, Indonesia Abstract In almost every cycle of upstream and downstream activities in the management and use of palm oil, there is certification for companies, farmers, providers, plantations, processing, distribution, etc., so what is actually sought from certification, what is sustainability aimed at, which aspects of certification have a sustainability impact seen from empirical studies and literature, there were 265 research articles published in 2008 - 2023 with the search keyword Palm Oil Certification indexed by Scopus for analysis using VOSviewer 1.6.19 software. There are differences in the object of study in palm oil producing regions, especially on the Asian continent, which focuses on how the government carries out certification activities and how independent smallholders can meet existing certification standards, while the European and American continents focus on testing whether certification and certification activities and implementation of certification have been implemented. done as it should Keywords: Palm Oil Plantation Certification- Sustainability- Global Share Link | Plain Format | Corresponding Author (Dedi Kusuma Habibie)

27	Environmental Sciences	ABS-30
Incorporation of Fe(III)-IIPs (Ion Imprinted Polymers) and PVA/Gelatine Nanofiber using Electrospinning Method for Potential Adsorbent Membrane of Fe3+ Ions Muhammad Ihsan Alfikro(a),(b)- Nopa Afrizal(a),(b)- Jorena(a),(b)- Khairul Saleh(a)- Octavianus Cakra Satya(a)- Frinsyah Virgo(a)- Idha Royani(a*),(b) (a) Department of Physics, Faculty of Mathematics and Natural Sciences, Sriwijaya University, Indralaya Ogan Ilir, Palembang, South Sumatra 30662, Indonesia *idharoyani[at]unsri.ac.id (b) Laboratory of Material Science, Department of Physics, Faculty of Mathematics and Natural Sciences, University of Sriwijaya, South Sumatera, Indonesia Abstract The incorporation of imprinted polymers and electrospun nanofiber, which aims for continueable and better water treatment, has been quite challenging these days. But with simple incorporating method, it could be achieved. This study was conducted to incorporate these two technologies, with simple suspended method of Fe(III)-IIPs within PVA/GE pre-electrospinning solution. The process was carried out within 15kV, 0.25 mL/h, 60% RH, and 12 cm needle-collector distance in electrospinning apparatus settings. The FTIR characterization showed quite identical spectra, as an indication of stabilized polymeric network. SEM imaging vaguely showed linked fibers through spherical Gelatine encapsulation, with the majority of pore size distribution within nanoscale (below 100 nm). EDS analysis clearly detect the trace amount of iron element within the nanofiber mats, from the suspended particle of Fe(III)-IIPs, hence it can be state that the incorporation method has succeeded bringing Fe(III)-IIPs into nanofibers mats. Study also pointed constructive suggestion in accordance of poorly nanofiber substrate selection for better characterization data. Keywords: Imprinted Polymers- Electrospun Nanofiber- Fe(III)- PVA- Substrate Share Link | Plain Format | Corresponding Author (Muhammad Ihsan Alfikro)

28	Environmental Sciences	ABS-62
Differences of Water Quality of Upstream and Downstream Tidal River in South Sumatra, Indonesia Izromaita1, Eddy Ibrahim2, Suheryanto3 and Elisa Wildayana4 1Study Program of Environmental Science, Sriwijaya University, Jl. Raya Palembang - Prabumulih Km. 32, North Indralaya, Ogan Ilir, South Sumatera 30662 Indonesia 2Mining Engineering Department, Faculty of Engineering, Universitas Sriwijaya, Jl. Raya Palembang-Prabumulih KM 32 Indralaya, Ogan Ilir, Sumatera Selatan 30662, Indonesia 3Faculty of Mathematics and Natural Science, Sriwijaya University, Jl. Raya Palembang - Prabumulih Km. 32, North Indralaya, Ogan Ilir, South Sumatera 30662 Indonesia 4 Faculty of Agriculture, Sriwijaya University, Jl. Raya Palembang - Prabumulih Km. 32, North Indralaya, Ogan Ilir, South Sumatera 30662 Indonesia Abstract Banyuasin Regency, which part of its territory is tidal land, like the Gasing River. The data used secondary data using SPSS. Most of the results of pH measurements were the range 2.82 - 5.75. The COD parameters are all above the quality standard. For TDS, DO, BOD, and TSS all are still below the quality standard. Heavy metal parameters such as Fe-T of the year there are concentrations of more than the quality standard. In addition, Cu-T is all above the quality standard. Results of comparative analysis of water characteristics at pH, temperature, TDS, DO, BOD, COD and TSS. The results of comparative analysis of Zn-T, Fe-T, Cd-T, Pb-T, and Cu-T found no differences in all conditions. The moderate pollution index was found in the downstream part of the April 2017 measurement of 6.54. While other data shows a light pollutant index with a value range of 1.17-4.80. Keywords: gasing river- water quality- heavy metals- water characteristics- tides Share Link | Plain Format | Corresponding Author (Izromaita Izromaita)

29	Environmental Sciences	ABS-74
Synthesis of Fe(III)-IIPs (Ion Imprinted Polymers): Effect of 6M HCl Solvent on Extraction Variations in Cavity Formation of Fe(III)-IIPs Eti Desti Sastia(a),(b)- Jorena(a),(b)- Octavianus(a)- Frinsyah Virgo(a)- Erry Koryanti(a)- Idha Royani (a*),(b) (a) Departement of Physics, Faculty of Mathematics and Natural Sciences, Sriwijaya University, Indralaya Ogan Ilir, Palembang, South Sumatera, 30662, Indonesia *idharoyani[at]unsri.ac.id (b) Laboratory of Material Science, Departement of Physics, Faculty Mathematic and Natural Sciences, University of Sriwijaya, South Sumatera, 30662, Indonesia Abstract The heavy metal iron (Fe) is a pollutant that pollutes the aquatic environment and hurts health. Research on Fe(III)-IIPs aims to create an adsorbent capable of absorbing Fe ions by imprinting ionic IIPs (Ion Imprinted Polymers) using the cooling-heating method. Polymerization involves Fe(NO3)3, methacrylic acid (MAA), ethylene glycol dimethacrylate (EGDMA), benzoyl peroxide (BPO), and chloroform as analytes, functional monomers, cross-linkers, initiators and solvents. Fe(III)-IIPs were extracted using 6M HCl to remove the template from the polymer body involving varying times (18 hours and 12 hours) and repetitions (7 times and 10 times). HCl as a porogen solvent is more effective at removing Fe metal ions in the extraction process than other similar acid solutions such as HNO3. Based on FTIR characterization testing, there was a 7% increase in transmittance percentage in Fe(III)-IIPs variation II. The test results of the best sample (Fe(III)-IIPs Variation II) were subjected to SEM characterization which produced 515 cavities <100 nm. Keywords: Imprinted Polymer, Fe(III)-IIPs, Extraction, HCl 6M Share Link | Plain Format | Corresponding Author (Eti Desti Sastia)

30	Environmental Sciences	ABS-92
IDENTIFICATION OF LANDSLIDE POTENTIAL USING 2D RESISTIVITY METHOD WITH WENNER AND WENNER-SCHLUMBERGER CONFIGURATIONS AT SUKAWINATAN LANDFILL IN PALEMBANG Muhammad Riko1, M. Daffa Alfaros Syah1, Siti Sailah2*, Erni2, Agus Purwoko3, Hary Widjajanti3 1Student of Physic Department, Faculty of Mathematic and Natural Sciences, Sriwijaya University 2Lecturer of Physic Department, Faculty of Mathematic and Natural Sciences, Sriwijaya University 3Lecturer of Biology Department, Faculty of Mathematic and Natural Sciences, Sriwijaya University *Corresponding Author : siti.sailah[at]unsri.ac.id Abstract Keywords: Slide field, Geoelectric, Wenner-Schlumberger Configuration, Wenner Configuration, Resistivity, Sukawinatan Landfill Share Link | Plain Format | Corresponding Author (Siti Sailah)

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