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INDONESIA
Indonesia Chimica Acta
Published by Universitas Hasanuddin
ISSN : 2085014X     EISSN : 26556049     DOI : -
Core Subject : Engineering,
Chemical Engineering, Chemistry & Bioengineering
Jurnal Akta Kimia Indonesia (Indonesia Chimica Acta) is a peer-reviewed research journal that is devoted to the dissemination of new and original knowledge in all branches of chemistry. The result of research and development in the fields of chemistry in both experimental and theory/ computation, chemical-based technological innovations, and chemical applications in industrial fields. The journal publishes original research articles or review articles in organic chemistry, inorganic chemistry, analytical chemistry, physical chemistry, biochemistry, and environmental chemistry.
Arjuna Subject : -
Articles 5 Documents
 1 
Search results for , issue "Volume 3 No 1 - June 2010" : 5 Documents clear
Studi Potensi Pencemaran Lingkungan Dari Kegiatan Pertambangan Emas Rakyat Poboya Kota Palu Ruslan Ruslan; Khairuddin Khairuddin
Jurnal Akta Kimia Indonesia (Indonesia Chimica Acta) Volume 3 No 1 - June 2010
Publisher : Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20956/ica.v3i1.5972

Abstract

Study of environmental pollution potential of gold mining activities of Poboya society had been done. The aim is to obtain information on the amount of mercury concentrations in the river, tromol activity and the burning process of amalgam. The data was collected by survey and interview methods, while water and sediment sampling in rivers, wastewater and solid at tromol activity, and soil sampling around the burning of amalgam at different distances. The result showed that the presence of metallic mercury from mining activities both traditional mining using large discs made since the year 2007 and those that use Tromol which has been underway since August 2009 until now. The highest concentration of mercury in the river was 0.080 ppm, and the lowest was 0.005 ppm and the highest river sediment was 58.000 mg/kg, the lowest was 4.000 mg/kg. Then the concentration of mercury in waste water supreme tromol activity was 0.040 ppm, and the lowest was 0.005 ppm and the highest solid waste (tailings) was 88.2 mg /kg, the lowest was 80.8 mg/kg. Mercury levels around the burning of five sampling locations with different distances between 45.5 mg/kg to 99,90 mg/kg. Partially contained metal mercury at some point in the example has exceeded the maximum allowable concentration limit in a holistic and unsafe condition had been beyond its maximum concentration and water quality standard, sediment, wastewater and solid waste as required.Keywords : Traditional mining, Mercury.
Optimalisasi Proses Sintesis Dan Karakterisasi Biodiesel Dari Minyak Alga Merah (Eucheuma cottonii) Dengan Katalis Kalium Hidroksida (KOH) Muhammad Zakir; Indah Raya; Asbia Asbia
Jurnal Akta Kimia Indonesia (Indonesia Chimica Acta) Volume 3 No 1 - June 2010
Publisher : Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20956/ica.v3i1.5973

Abstract

Research on the optimalization of synthesis process of biodiesel as an alternative fuel from red algae oil (Eucheuma cottonii) with potasium hidroksida (KOH) had been done. Red algae (E. cottonii) oil was used as raw material in the Biodiesel synthesis. Red algae oil was gained through extraction process with soxhletation method using n-heksane as solvent. Biodiesel (methyl ester) had been synthesized from red algae oil by transesterification process used methanol as solvent and KOH as catalyst. The process had been done at 40, 50, 60, and 70 oC with reaction time 2, 3, 4, and 5 hours. The total fatty acids and free fatty acids of the product were used in the calculation of conversion value. The optimum temperature and reaction time giving the greatest number of biodiesel conversion is 60 0C for 4-5 hours with conversion 24,1077%. The biodiesel of highest conversion was characterized physically and chemically. The Result showed that viscosity, density, water value, and iodine number were 4,432 cSt, 0,8383 g/mL, 0,013, and 10,66 mg/mek, respectively. Biodiesel from red algae oil that was not effective to be used as alternative fuel because of its product is very low.Keywords: Biodiesel fuel, Eucheuma cottonii, transesterification, KOH
Optimasi Produksi Enzim Lipase Dari Isolat Aspergillus oryzae Seniwati Dali; Rauf Patong; Muhammad Noor Djalaluddin; Pirman AP
Jurnal Akta Kimia Indonesia (Indonesia Chimica Acta) Volume 3 No 1 - June 2010
Publisher : Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20956/ica.v3i1.5969

Abstract

Production optimization of lipase enzyme from Aspergillus oryzae isolate on moldy copra has been conducted. Enzyme isolation is carried out after the fungi is activated and cultured on media containing peptone and olive oil at 370C in temperature and 7,0 in pH during 8 days. Production optimization of lipase enzyme is conducted by varying composition of production media, namely: peptone concentration and olive oil and optimal stirring speed. The study results showed that activity of the highest lipase enzyme is acquired on pepton concentration of 1 %, olive oil concentration of 3 % and the stirring speed is 150 rpm. Of concentration optimization of production media and stirring speed is acquired that there is an increasing activity of the lipase enzyme from 13.222 U/mL to 18888U/mL.
Pengaruh Konsentrasi Glutaraldehid Pada Komposisi Membran Elektroda Biosensor Pestisida Karbamat Mashuni Mashuni; Muhammad Syahrul; Ahyar Ahmad; Abdul Wahid Wahab
Jurnal Akta Kimia Indonesia (Indonesia Chimica Acta) Volume 3 No 1 - June 2010
Publisher : Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20956/ica.v3i1.5970

Abstract

In recent years carbamic pesticides, which show low environmental persistence but a high acute toxicity. Their presence in environmental and food poses a potential hazard to human health and there is a growing interest in their rapid and accurate determination for food safety and environmental monitoring. The aim of this research is to design biosensor for analyzing carbamate pesticides residue in sample show with composite variable concentrate glutaraldehyde (GA) in electrode membrane. Enzim acetylcholinesterase (AChE) was co-immobilised with choline oxidase (ChO) onto a platinum (Pt) surface using a solution of 10% cellulose acetate and 15%, 20%, 25% glutaraldehyde. Result of this research show that glutaraldehyde 15% the detection limit is 10-7,8 M for glutaraldehyde 20% the detection limit is 10-8,4 M and glutaraldehyde 25% the detection limit is 10-8,7 M. This a results is approximately equal to 0,0022 ppm or 2,2 ppb – 0,0002 ppm or 0,2 ppb, which means that this biosensor is sensitive for determining carbamates pesticides residue where its detection limit is comparable to to the detection limit of conventional instrument such as Gas Chromatography (GC) and High Pressure Liquid Chromatography (HPLC), i.e. respectively 1,5 ppb and 2,0 ppb. The proposed electrochemical pesticide sensitivity test exhibited high sensitivity, desirable accuracy, low cost and simplified procedure.Keywords: Biosensors, glutaraldehyde, cellulose acetate, immobilised, carbamate Biosensors, glutaraldehyde, cellulose acetate, immobilised, carbamate pesticides
Bioakumulasi Ion Logam Kadmium Oleh Fitoplankton Laut Tetraselmis chuii dan Chaetoceros calcitraus Muhammad Sjahrul; Arifin Arifin
Jurnal Akta Kimia Indonesia (Indonesia Chimica Acta) Volume 3 No 1 - June 2010
Publisher : Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20956/ica.v3i1.5971

Abstract

The use of the marine phytoplankton, Tetraselmi chuii and Chaetoceros calcitrans have already been reported. The relationships of the usefulness as phytoremidiator on cadmium polluted marine are not yet well understood. Therefore, this study was conducted to evaluate the influence of Cd2+ addition on fitoplankton medium towards the growth, interacting time, pH medium that could accumunlate Cd2+ in the function groups involved in the bioaccumulation prosess of Cd2+ by phytoplankton. The method of the analysis and the data collectionwas carried out on (1) the growth acceleration, the number of phytoplankton cells, and the chlorophyl-a content; (2) the Cd2+ content in phytoplankton on various interacting time, and pH medium; and (3) the infra-red spectrum of phytoplankton biomass before and after the interaction with Cd2+. The addition of Cd2+ on T. chuui medium can decrease the growth and content of chlorophyll-a, while the addition of Cd2+ on C. Calcitrans medium can increase the growth and content of chlorophyl-a. The phytoplankton can accumulate Cd2+ in the pH8 in the interacting time of 15 minutes with the optimal accumulating ability of 13.46 and 1, 055.27 mg Cd2+ per gram of T. chuii and C. Calcitrans biomasses successively. The function groups of T. Chuii involved in the bioaccumulation process of Cd2+ are-OH, CN, S=O, N-O, S-S and M-S, while on C. Calcitrans, the function groups are-OH, C=0, S-S, M-S and C=C.Keywords: Bioaccumulation, Kadmium, Tetraselmis chuii, Chaetocer calcitransKey

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