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Rahmat Gunawan
Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman
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PEMANFAATAN ABU BATUBARA SEBAGAI ZEOLIT YANG TERDEALUMINASI DALAM MENGADSORPSI FENOL Agustinus Pata; Saibun Sitorus; Rahmat Gunawan
JURNAL KIMIA MULAWARMAN Vol 12 No 1 (2014)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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A research on the adsorption of phenol with zeolite adsorbent is formed from coal ash by hydrothermal process with the fusion method. In addition, the improvement in the ability of zeolite adsorbtion on the zeolite dealimination process is done. Phenol adsorption process is done through a batch shaker method with test parameters pH, contact time and adsorption capacity factor. The measurement results for the phenol optimum conditions were at pH 10 with a contact time of 30 minutes with the value of the phenol capacity of zeolite was 1,1853 mg/g were obtained using Langmuir isotherm adsorption equation.Keywords : Zeolite of coal ash, dealumination, adsorption, phenol.
STUDI AB INITIO GRAFIT BATUBARA SEBAGAI MATERI PENYIMPAN HIDROGEN Rahmat Gunawan; Melanie David; Hideaki Kasai; Muhammad A. Martoprawiro; Cynthia L. Radiman; Herman K. Dipojono
JURNAL KIMIA MULAWARMAN Vol 8 No 1 (2010)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Calculation of density functional theory (DFT) is carried out to investigate the adsorption of six molecules of H2 molecules on a graphite planar layer with a doping of alkali metal (Li, Na, and K). We reported that the DFT-GGA method, the presence of alkali metals on graphite, and H2-(GICs), have changed the interaction and the electronic system. We also reported that the ratio increased electron transfer from K to Na and Li. The calculation of the charge density shows that the increase in energy due to the transfer of electrical charge from GICs to six molecules of H2. This changes the electronic properties of graphite that are important in applications such as hydrogen storage.Keywords: Molecule Hydrogen, Graphite Intercalated Compounds, Density Functional Theory
MENINGKATKAN KUALITAS REPEATABILITY DAN REPRODUCIBILITY SAMPEL LIQUID GAS DE-ETHANIZER DI PT. BADAK DENGAN MEMODIFIKASI ALAT PREPARASI PADA KROMATOGRAFI GAS Ardiansyah -; Chairul Saleh; Rahmat Gunawan
JURNAL KIMIA MULAWARMAN Vol 11 No 2 (2014)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Modification has been done to the gas chromatograph by adding a de-ethanizer preparation tool that serves as the evaporation of liquid samples de-ethanizer gas from the LNG (Liquid Natural Gas) plant PT. Badak NGL Bontang, East Kalimantan. With the aim to obtain stable analysis results as required. From the results obtained for the repeatability value 0.104% methane component, 0.036% ethane component and 0.154% propane components and reproducibility values obtained for the methane component of 0.025%, 0.036% component ethane, and propane components 0.014%. Data analysis of the samples obtained test results are still below thelimit allowed by the method of GPA 2261-64 which found samples with good homogeneity so that the analysis becomes stable and the true value can be resposibility and laboratory as a Quality Control can keep reliability for LNG Plant. Keywords: liquid natural gas, de-ethanizer, gas chromatography, repeatability, reproducibility, GPA2261-64
VALIDASI METODE ANALISIS KADAR TIMBAL (Pb) DALAM MADU ALAM DI KALIMANTAN TIMUR Finqo Aprianto; Bohari Yusuf; Rahmat Gunawan
JURNAL KIMIA MULAWARMAN Vol 9 No 2 (2012)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Analysis method for determining Pb content in natural honey have been developed and validated. Research was done by analyzing one natural honey sample collected from Teritip (Balikpapan) with standard analysis method and three developed analysis method which their analytical performance tested later. Pb content was determined with atomic absorption spectrometry after dry digestion (method A) or wet digestion (method B (HNO3-H2O2; 3:8), C (HNO3-H2O2; 2:1) and D (HNO3)). Analytical performance parameter e. G. Linearity, working range, limit of detection, limit of quantitation, precision and accuracy were tested. Content of Pb in natural honey sample which analyzed with method A, B, C and D were found at 0.7923 ± 0.0311 µg/g, 0.7944 ± 0.0216 µg/g, 0.7998 ± 0.0218 µg/g and 0.7912 ± 0.0160 µg/g respectively. Analytical performance of four tested analytical method were still acceptable. Significance testing result showed that there were no significant differences in precision and accuracy between developed analysis method and standard analysis method, execpt for method D. Precision of method D was significantly better than standard analysis method.Keywords: Honey, Lead, Method Validation
UJI AKTIVITAS ANTIHIPERGLIKEMIK EKSTRAK ETANOL DAUN TEMBELEKAN (Lantana camara L.) TERHADAP MENCIT PUTIH JANTAN TERINDUKSI ALOKSAN Eka Setia Rini; Rudi Kartika; Rahmat Gunawan
JURNAL ATOMIK Vol 1 No 2 (2016)
Publisher : Jurusan Kimia FMIPA UNMUL

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Phytochemical screening has been conducted on the ethanol extract of tembelekan leaves (Lantana camara Linn) which showed the presence of alkaloids, flavanoids, steroids, triterpenoids and phenolic. Testing antihyperglicemic activity of ethanol extract tembelekan leaves conducted experiments in the laboratory with each dose 14 mg/kg BW, 28 mg/kg BW and 56 mg/kg BW given orally in male mice induced by alloxan. Measurement of blood glucose levels done on day 0, 4, 8, 14 and 18 by using glucometer and glucose test strips. The decrease in blood glucose levels is 56,89 % with ethanol extract tembelekan leaves dose 56 mg/kg BW. The results showed that there is decrease in blood glucose because given ethanol extract tembelekan leaves.
Co-Authors Agustinus Pata Alimuddin - Amalia Saleha Aman Sentosa Panggabean Ardiansyah - Arif Ari Wibowo Boby Royan alfadlil Bohari Yusuf Chairul Saleh Cynthia L. Radiman Darmin - Eka Setia Rini Eko Haryanto Eva Marliana, Eva Finqo Aprianto Herman K. Dipojono Hevin Muttaqin Hideaki Kasai Jumaidil Awal Melanie David Muhammad A. Martoprawiro Nisa Hayatun Nufus Sunandar Rudi Kartika, Rudi Saibun Sitorus Teguh Wirawan Yulianti Kartika