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INDONESIA
Jurnal Akademika Kimia
Published by Universitas Tadulako
ISSN : 24775185     EISSN : 23026030     DOI : -
Core Subject : Science, Education,
Chemistry Education
Jurnal Akademika Kimia merupakan jurnal elektronik open access yang bertujuan untuk mempublikasi hasil-hasil penelitian terbaru dalam area pendidikan akademik khususnya pada bidang pendidikan kimia meliputi asesment pembelajaran, model pembelajaran dan pengembangan perangkat pembelajaran, serta kimia murni termasuk kimia organik, kimia anorganik, kimia analitik, kimia fisik, biokimia dan bidang kimia lainnya seperti kimia lingkungan.
Arjuna Subject : -
Articles 240 Documents
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Pemanfaatan Biomassa Serbuk Gergaji Sebagai Penyerap Logam Timbal Intan, Dey; Said, Irwan; Abram, Paulus Hengky
Jurnal Akademika Kimia Vol 5, No 4 (2016)
Publisher : Universitas Tadulako

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Abstract

Lead (Pb) is one kind of heavy metal that has high level of toxicity. One way to reduce the level of Pb is by adsorption using cellulose and lignin of sawdust. The aim of this study is to determine the optimum pH, the optimum weight and to determine the adsorption capacity of sawdust when it absorbs Pb in solution of Pb(NO3)2. The adsorption process is carried out by using the various pH of 3, 4, 5, 6, 7, and 8 with a weight of 100 mg, and then the various weight of 100, 200, 300, 400, and 500 mg with the pH optimum. The analysis of Pb content in the solution was conducted by Spectro-direct. The analysis result shows the determination of pH occured at pH 7, Pb absorbed is 14.89 mg/g, and the percentage of Pb absorbed was 96.97%. For the determination of 400 mg of the adsorbent weight of Pb absorbed was 3,83 mg/g, the adsorption percentage of Pb was 99.98%, and the optimum adsorption for optimum weight was 0.15 mg Pb/mg sawdust.
Model Pembelajaran Kooperatif Tipe Make A Match Untuk Meningkatkan Hasil Belajar Kimia Siswa Kelas X Pada Materi Hidrokarbon SMA Negeri 1 Dolo Elvian Togagu; Suherman Suherman; I Made Tangkas
Jurnal Akademika Kimia Vol 3, No 3 (2014)
Publisher : Universitas Tadulako

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Abstract

Hydrocarbon is one of the chemical topics that is taught in grade X in senior high school.This topic consisted of carbon (C) and hydrogen (H) elements in the discussion process. The objective of this research was to improve the students’ learning outcomes of grade X by applying cooperative learning model make a match type in chemistry subject, with hydrocarbon material at SMA Negeri 1 Dolo in the academic year 2012/2013. The subjects of this research were the students of grade XA with the total number of 26 students. The instruments used in this research were pre-test, post-test which consist of 16 questions and observation sheets. From the students’test results; it was found that there were 23% students were in low category. After the researcher applied the cooperative learning model with Make A Match type in the first cycle, the percentage of the students’ classical completeness reached to 73%, with the classical absorption of 77% in good category. In the second cycle, the percentage of the students’ classical completeness was 96% with the classical absorption percentage of 84% which is in very good category. It could be seen from the outcomes that after cooperative learning model make a match type applied, there was an improvement in the percentage of the students’ learning outcomes.
Uji Aktivitas Antioksidan Ekstrak Buah Semangka (Citrullus lanatus) Mariani, Sri; Rahman, Nurdin; Supriadi, Supriadi
Jurnal Akademika Kimia Vol 7, No 2 (2018)
Publisher : Universitas Tadulako

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Abstract

The aim of this study is determine the IC50 extracts values of white peel and flesh of red watermelon, white peel and flesh of yellow watermelon as antioxidants. To determine antioxidant activities DPPH reagent was used as well as UV-Vis Spectrophotometry was used to measure vitamin C as a positive control measurement. The samples mixed with ethanol in various concentration of 5, 15, 25 and 35 mg/L. The results showed that the IC50 values for each extract of red watermelon flesh, yellow watermelon flesh, white peel of red watermelon, and white peel of yellow watermelon were 16.619 mg/L, 16.575 mg/L, 14.729 mg/L, and 16.782 mg/L, respectively. Vitamin C as the positive control has IC50 value of 9.526 mg/L. These IC50 values showed that vitamin C had higher antioxidant activity than watermelon extracts, but the extracts of watermelon still categorized in strong natural antioxidants. This study concluded that watermelon is good to be consumed because it is a very strong antioxidant.
Pengaruh Penerapan Model Pembelajaran Kooperatif Tipe Jigsaw Pada Materi Kesetimbangan Kimia Terhadap Hasil Belajar Siswa Kelas XI MIA SMA Negeri 2 Palu Sisilia, Maria; Sakung, Jamaluddin; Said, Irwan
Jurnal Akademika Kimia Vol 4, No 4 (2015)
Publisher : Universitas Tadulako

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Abstract

The aim of this study is to determine the learning outcomes of students in the class which is treated with the cooperative learning model Jigsaw whether it is better than the untreated class on chemical equilibrium topic. This study is a quasi-experimental research design with Non Randomized Pretest- posttest control group design. The population in this study is 245 students of class XI MIA with academic year 2014/2015, from 8 classes. The sample in this study class XI MIA 5 (n = 32) as an experimental class while class XI MIA 6 (n = 32) as a control class. The analysis of data obtained in the experimental class, X1 1 valueis 79.66 with a standard deviation = 9.41. In the control class, X2 valueis 70.03 with a standard deviation = 11.13. The result of hypothesisis found that tcalculated>ttable (5.53 > 1.67) with a significance level (α = 0.05) and degrees of freedom = 62. This shows that H0 is rejected and H1 is accepted. Therefore, it can be concluded that student learning outcomes in class which is treated using the cooperative learning model Jigsaw is better than the untreated class on chemical equilibrium topic.
Pengaruh Waktu Fermentasi Terhadap Kadar Bioetanol Dari Kulit Jagung Manis (Zea mays saccharata) Agustina M., Renni; Ratman, Ratman; Said, Irwan
Jurnal Akademika Kimia Vol 5, No 4 (2016)
Publisher : Universitas Tadulako

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Abstract

This study aimed to determine the effect of fermentation time on the level of bioethanol from sweet corn bark. Sweet corn bark is one of the agricultural wastes containing cellulose which can be converted to bioethanol through several stapes. The steps were sample preparation, delignification, hydrolysis, and fermentation. This study applied fermentation process on the sweet corn bark using yeast bread (saccharomyces cereviseae) with time variations i.e 2-8 days.The products of fermented ethanol increasedand reached the optimum at 6 days fermentation with the bioethanol level of 4.50,then decrease the ethanol content at day 7 and 8.
Analisis Kandungan Vitamin C Dan Kalium Dalam Labu Kuning (Cucurbita Moschata) Setiawan, Heri; Sabang, Sri Mulyani; Tangkas, I Made
Jurnal Akademika Kimia Vol 3, No 4 (2014)
Publisher : Universitas Tadulako

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Abstract

Research has been conducted to determine the level of vitamin C by a visible spectrophotometer, and a metal content of potassium (K) from pumkin sample (Cucurbita Moschata) by Atomic Absorption Spectrophotometer (AAS). Measuring the levels of vitamin C in the sample performed at a wavelength (λ) = 510 nm and measuring the levels of potassium in the sample performed at a wavelength (λ) = 766,5 nm. The results obtained by the levels of vitamin C is sample A (pumpkin from Jono oge village) obtained at 6 mg/L, sample B (pumpkin from Sidera village) obtained at 4,5 mg/L, and sample C (pumpkin from Toro village) obtained at 0,97 mg/L. While the metal content of potassium is sample A (pumpkin from Jono oge village) obtained at 23,22 mg/L, sample B (pumpkin from Sidera village) obtained at 22,22 mg/L, and sample C (pumpkin from Toro village) obtained at 20,22 mg/L. These data indicate that the levels of vitamin C and potassium sample A higher than sample B and C.
UJI EFEKTIVITAS EKSTRAK KULIT LANGSAT (Lansium domesticum) SEBAGAI ANTI NYAMUK ELEKTRIK TERHADAP NYAMUK Aedes aegypti (A Test onthe Effectiveness of Lansium Peel Extract (Lansium Domesticum) as Mosquito Electric Repellent Against Aedes aegypti Mosquitoes) Mirnawaty, Mirnawaty; Supriadi, Supriadi; Jaya, Budiman
Jurnal Akademika Kimia Vol 1, No 4 (2012)
Publisher : Universitas Tadulako

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Abstract

The research concerning a test on the effectiveness of lansium peel extract (lansium domesticum) as a mosquito electric repellent against AedesAegypti mosquitoes has been done. This research aimed to know the effectiveness of lansium peelextractas anelectricmosquito repellent. The method used was laboratory experiments. The lansium peel extract obtained from the maceration method added with absolute methanol was evaporated to produce thick lansium peel extract. Then, the extract was diluted to the concentration of 35, 30, 25, 20, and 15%. The research data obtained was the death of aedes aegypti which then was analyzed by statistical varian analysis test (ANOVA) with the95% confidence level. It was followed by Duncan test to determine the most effective concentration. The result showed that the most effective concentration as electrical mosquitoes repellent was 25%.
Analisis Kandungan Nitrogen (N) dan Posforus (P) pada Limbah Jeroan Ikan Mujair (Oreochromis mosambicus) Danau Lindu Hildawianti, Hildawianti; Tiwow, Vanny M. A.; Abram, Paulus Hengky
Jurnal Akademika Kimia Vol 6, No 3 (2017)
Publisher : Universitas Tadulako

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Abstract

An effort to minimize the environmental pollution is using that waste as a base material of organic fertilizer. This study was conducted to determine the levels of Nitrogen (N) and phosphorous (P) contained in the offal waste of mujair fish (Oreochromis mosambicus) from Lindu lake. Samples of mujair offal waste were taken from fish saler on the street Towua, Palu. Analysis of Nitrogen levels usedKjeldhal method which consists of three phases, namely destruction, distillation, and titration. On the other hand, for Phosphorus analysis was using wet digestion method, followed by absorbance measurements of samples with spectronic 20 at a wavelength of 720 nm. Based on the analysis, the average of nitrogen (N) levels in mujair offal waste was 2.78%, while the average of phosphorus (P) levels was 2.48%. From these results, it is known that mujair offal waste contains more nitrogen (N) compared to phosphorous (P). In addition, when compared to the quality standard liquid organic fertilizer N and P content in mujair offal almost meets the quality standard liquid fertilizer, where the minimum technical requirements of organic liquid fertilizer should contain a total N content of 3-6% and 3-6% P2O5.
Uji Aktivitas Antioksidan Ekstrak Daun Binahong (Anredera cordifolia (Tenore) Steenis) Dengan 1,1-Difenil-2-Pikrilhidrazil (DPPH) Menggunakan Spektrofotometer UV-Vis Parwati, Ni Kadek Fina; Napitupulu, Mery; Diah, Anang Wahid M.
Jurnal Akademika Kimia Vol 3, No 4 (2014)
Publisher : Universitas Tadulako

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Abstract

Testing of antioxidant activity of binahong (anredera cordifolia (tenore) steenis) leafs extracts has been done with 1,1-diphenyl-2-picrylhydrazyl (DPPH) using UV-Vis spectrophotometer. The aim of this research was to determine the antioxidant activity of binahong leafs extracts. Concentration of 1,1-diphenyl-2-picrylhydrazyl (DPPH ) after addition of binahong leafs extracts was determined using UV-Vis Spectrophotometer. Various concentrations of binahong leafs extracts were 20 ppm, 40 ppm, 60 ppm and 80 ppm. Vitamin C was the positive control used at similar variation concentrations, whereas DPPH solution dissolved in absolute ethanol was as the negative control. The results showed that the IC50 values obtained for binahong leafs extracts and vitamin C were 40.27 ppm and 49.20 ppm. Based on the IC50 data, it can be seen that binahong leafs extracts are stronger antioxidant than vitamin C.
AKUMULASI LOGAM TIMBAL (Pb) DALAM IKAN BELANAK (Liza melinoptera) YANG HIDUP DI PERAIRAN MUARA POBOYA (Accumulation of Lead (Pb) Metal in Mullets (Liza melinoptera) that Live in Poboya River Estuary) Melisa Arsad; Irwan Said; Suherman Suherman
Jurnal Akademika Kimia Vol 1, No 4 (2012)
Publisher : Universitas Tadulako

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Abstract

Poboya River estuary that known to have been contaminated with heavy metals, one of them is metal lead (Pb). This is because the high human activity in the surrounding waters hed, which may be the source of the entry of heavy metals into the estuary waters. Poboya River estuary has many kinds of marine life, including fish such as Belanak (Liza Melinoptera). Fish used as an indicator of contamination that occurred in the waters. This study aims to determine how much accumulation and metal concentrations of lead (Pb), which accumulates in fish living Belanak Poboya estuaries. The method used is the gravimetric method for determining water content, biomass and low ash content, while the analysis of the samples in this study using Atomic Absorption Spectrometry instrument (SSA). The results showed that the water content mobtained at 55.830%. While the levels of biomass were obtained for 89.200% and ash content of meat samples obtained at 10.790%. While the results showed that the accumulation of the metal lead (Pb) in Belanak fish average of 1.746 ± 1.673mg/kg. That exceeds the maximum value of the metal Lead in food in accordance with ISO 01-2729.1-2006, ie 0.4 mg/kg.

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