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Department of Chemistry Faculty of Mathematics and Natural Sciences Universitas Andalas Kampus Universitas Andalas Limau Manih Padang 25163
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INDONESIA
Jurnal Riset Kimia
Published by Universitas Andalas
ISSN : 1978628X     EISSN : 24768960     DOI : -
Core Subject : Science,
Chemistry
Arjuna Subject : -
Articles 14 Documents
 1   2 
Search results for , issue "Vol. 5 No. 2 (2012): March" : 14 Documents clear
THE OPTIMATION SIMULTANEUOS DETERMINATION OF LEAD(II) AND CADMIUM(II) BY ADSORPTIVE STRIPPING VOLTAMMETRY (ADSV) Deswati -; Hamzar Suyani; Umiati Loekman; Nilam Sari
Jurnal Riset Kimia Vol. 5 No. 2 (2012): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v5i2.198

Abstract

A selective and sensitive adsorptive stripping voltammetric (AdSV) method for simultaneous determination of lead(II) and cadmium(II) were proposed. The aim of this study was to get the optimum condition for simultaneuos determination of lead(II) and cadmium(II). The parameters were studied such as: variation of accumulation potential, accumulation time, pH, and variation ofcalcon concentration. In this case, the optimum conditions were reached at accumulation potential –0.7 V, accumulation time 80 s, concentration of 0.12 mM calcon, and pH 7.0. At the optimumconditions the relative standard deviation were 2.90% and 1.46% for Pb(II) and Cd(II) respectively for eight replicates (n = 8) measurements. The method was applied for the direct determination of Pb(II) and Cd(II) in sea water around Bungus, Padang City. Concentration Pb(II) and Cd(II) insample were 9.918 μg/L – 27.320 μg/L for Pb(II) and 7.997 μg/L - 32.521 μg/L for Cd(II), with recovery of 99.48%, and 103.28 for Pb(II), and Cd(II) respectively.
PEMECAHAN (SPLITTING) MOLEKUL AIR MENJADI GAS H2DAN O2 MELALUI PROSES FOTOVOLTAIK Dini Fatmi; Admin Alif; Hamzar Suyani
Jurnal Riset Kimia Vol. 5 No. 2 (2012): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v5i2.209

Abstract

One method to overcome the scarcity of alternative sources of energy on earth is through the development of photovoltaic cells. This method used a solar energy to electrical energy transformation. In this research, breaking (splitting) of water molecules into H2 and O2 gas by the photovoltaic process uses electrodes CuO/C with Na2SO4 electrolyte. In this process used 2 photovoltaic cells as electricity producing and U-shaped electrolysis cell for solver (splitting) of water molecule produce H2 and O2 gas. CuO electrode (anode) is made through the burning of copper rod in a furnace at temperature 400 oC with a variety of combustion 1, 3, 4 times each lasting for 1 hs, while the cathode in the form of carbon rods obtained from 2B pencil. The optimum conditions for Na2SO4 electrolyte concentration is 0.8 N and for CuO electrodes with 3x burning. Optimum efficiency photovoltaic process was 2.66%. H2 and O2 gas volume obtained near stoichiometric ratio is 2 : 1.
PENGGUNAAN FRONTIER ORBITAL MOLEKUL SEBAGAI DESKRIPTOR PADA ANALISIS HUBUNGAN KUANTITATIF STRUKTUR AKTIVITAS (HKSA) TOKSIK SENYAWA KHLOROFENOL - Emdeniz
Jurnal Riset Kimia Vol. 5 No. 2 (2012): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v5i2.211

Abstract

Quantitative structure-activity relationship (QSAR) methods have been applied to prediction of the toxicity of certain chemical compound. In this research a QSAR descriptor used frontier molecular orbital (LUMO energy (EL), HOMO energy (EH), and band gap (ΔE) and its derivatives were obtained from density functional theory (DFT) (chemical hardness (η) chemical potential (μ) or absolute electronegativity (χ) and global electrophicility indeks (ω)). Frontier molecular orbital (EL and EH) was calculated by ab initio quantum methods. This research found the correlation between the experimental ecotoxicological data of chlorophenols and toxicity prediction were calculated based on the best QSAR equation model of all equation model which have been studied. The best QSAR equation model using parameter LUMO energy (EL), and global electrophilicity index (ω) as descriptor on QSAR toxic of chlorophenol compounds against Bacilus sp TL81 is - log IC50 = 11,022 - 1,767 EL - 5,687 ω, and it has the coefficient of determination (R2) = 0,581 and standard deviation (SD) = 0,6111.
OPTIMASI TRANSPOR Cu(II) DENGAN APDC SEBAGAI ZAT PEMBAWA MELALUI TEKNIK MEMBRAN CAIR FASA RUAH - Imelda; Zaharasmi Kahar; Maria Simarmata; Djufri Mustafa
Jurnal Riset Kimia Vol. 5 No. 2 (2012): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v5i2.212

Abstract

The transport of Cu(II) with Ammonium Pyrrolidine Dithiocarbamate(APDC) as carrier through bulk liquid membrane had been researched. The measurement was performed to source phase and feed phase by using Atomic Absorption Spectrophotometer toward λmaks 324.7 nm. The result of the research showed the optimum condition to separate 20 ppm of Cu(II) was at pH 4 of source phase, concentration of APDC was 1 : 30, stirring time was 2 hours, and the stirring velocity was 300 rpm with the percentage of Cu(II) transport to feed phase was 97,06% and percentage of remains Cu(II) was 0%.
PEMBUATAN KOMPOS DARI LIMBAH PADAT (SLUDGE) PABRIK PULP DAN PAPER Maria Peratenta Sembiring; Rozanna Sri Irianty
Jurnal Riset Kimia Vol. 5 No. 2 (2012): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v5i2.213

Abstract

One of the method to use pulp and paper mill sludge was convert it become a compost. This research result showed that time variation of compost have different physical and organic matter properties. In physical properties, 3 months of compost had 12.57% moisture content, while organic matter contain 10.56% carbon, 1.07% nitrogen, and 9.87 C/N ratio. For 4 months compost had 6.79% moisture content, 11.88% carbon, 0.91% nitrogen, and 13.05 C/N ratio. Nutrients content from both composts appropriate with the standard value of National Standarisation Body.
PENGARUH HIDROLISIS ENZIMATIS TERHADAP PRODUKSI BIOETANOL DARI UMBI TALAS (Colocasia gigantea Hook F) Marniati Salim; Elida Mardiah; Febby Febrizal
Jurnal Riset Kimia Vol. 5 No. 2 (2012): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v5i2.214

Abstract

Umbi talas (Colocasia gigantea Hook F) are rich of starch (77.9%), that could be fermentated to form bioethanol for reneweable energy. The ethanol were produced by fermenting the hydrolised enzymaticly by α-amylase and glucoamylase at the variation 4, 5, 6, 7, and 8 mL for 1, 2, 3, 4, and 5 hours. The glucose produced was measured by Somogy-Nelson methode. The product of hydrolysed were optimum with 6 mL α-amylase and 7 mL glucoamylase for 4 hours wich gave 64,222 g/L of reducing sugar. The product of ethanol were analyzed by Gas Chromatography (GC). The maximum bioethanol production obtained after 5 days fermentation was 4.0123%.
UJI SELEKTIFITAS TRANSPOR Cu(II) TERHADAP Mg(II), Ca(II) DAN Sr(II) DENGAN ZAT PEMBAWA OKSIN DAN SDS SEBAGAI ADITIF MELALUI TEKNIK MEMBRAN CAIR FASA RUAH Olly Norita Tetra; Zaharasmi Kahar; Admin Alif; - Frengky
Jurnal Riset Kimia Vol. 5 No. 2 (2012): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v5i2.215

Abstract

Selectivity of Cu(II) transport from the source phase containing Mg(II), Ca(II) and Sr(II) into the receiver phase had been researched by using oxine as carrier and Sodium Dodecyl Sulfate (SDS) as additive through bulk liquid membrane.The efficiency of the method depends on parameter (the pH of the donor and acceptor phase, effect of carrier concentrations, and time of transport). The selectivity of the method was assessed by performing the single, as well as the competitive transport experiment of Mg(II), Ca(II,) and Sr(II) ion and then Cu(II) percentage which was transported to receiver phase 99.98% and residue in source phase do not detect. The measurement was done to both of source phase and receiver phase by using Atomic Absorption Spectrophotometer (213.9 nm).
ISSN : 1978-628X KINETIKA TRANSPOR FENOL DENGAN ADITIF SURFAKTAN DALAM TEKNIK MEMBRAN CAIR FASA RUAH - Refinel; Djufri Mustafa Mustafa; Welly Safitri; Yulia Yesti; Rudhy Anggi
Jurnal Riset Kimia Vol. 5 No. 2 (2012): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v5i2.216

Abstract

Study of transport of phenol using the surfactant SDS (Sodium Dodecyl Sulfate), Tween-80 as additive in the source phase and oleic acid, Span-60 additive in the membrane phase with bulk liquid membrane techniques has been performed. Transportation system was in one way using solution of phenol 2.13 x 10 -4 M as the source phase, 30 mL of chloroform as membrane phase, a solution of 12 mL of 0.1 M NaOH as the receiving phase and stirring speed of 340 rpm. The concentration of phenol that transported into receiving phase and remaining in the source is determined by measuring phenol method using 4-aminoantipirin and monitored with a spectrophotometer. The result showed the percentage of transport of phenol into the receiving phase is 93.07% within 120 minutes without any additive surfactant, while for additive oleic acid and Span-60 the percentage of transport phenol is 97.28% and 88.84% within 90 minutes. Phenol transport system analyzed by means of a kinetic model involving consecutive irreversible first order reaction with the constants extraction of phenol from the source to the membrane (k1) of 0.0346 minute-1, 0.0304 min-1, and from the membrane phase into the receiving phase (k2) of 0.0264 min-1, 0.0309 min-1 each for additive oleic acid and Span-60 in the membrane phase. Surfactant SDS and Tween-80 additive in the source phase is not effective to decreased the transport time of the phenol in the phase bulk liquid membrane technique.
PENGOLAHAN LIMBAH POLIPROPILEN MENJADI BAHAN BAKAR CAIR MELALUI METODE PIROLISIS Restina Bemis; Novesar Jamarun; Syukri Arief
Jurnal Riset Kimia Vol. 5 No. 2 (2012): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v5i2.217

Abstract

Plastics become the biggest environmental problem when it accumulate in landfills because its non-biodegradable properties. To handle the problems, the plastics were processed to produce liquid fuels by means pyrolysis method which was in this case with and without a catalyst. In this work, polypropylene was used as a precursor and SiO2, zeolites, CaO, Fe as catalysts. FTIR spectrum of pyrolized polypropylene with and without catalysts both have shown C = C functional group at 1648 cm-1. GCMS analysis confirmed the availability of chain length of hydrocarbon between C7 -C27 which is mixture of kerosene and diesel fractions. Catalysts can lower the temperature and time reaction of pyrolysis process as they increase rendement (%) of product. Liquid fuels that produced from polypropylene pyrolysis without catalyst was 72.06%, and with catalysts were 79.59% (SiO2), 74.76%, (zeolite), 76.80% (CaO), and 76.83% (Fe).
PENGARUH KONSENTRASI INHIBITOR EKSTRAK DAUN GAMBIR DENGAN PELARUT ETANOL-AIR TERHADAP LAJU KOROSI BESI PADA AIR LAUT Rozanna Sri Irianty; Maria Peratenta Sembiring
Jurnal Riset Kimia Vol. 5 No. 2 (2012): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v5i2.218

Abstract

The important properties to overcome the corrosion are safe, available, biodegradable, low cost, and environmental friendly. Gambier leaves extract is one of the inhibitor that have environmental friendly properties. This study aims to determine the effectiveness of extract using ethanol-water to reduce the corrosion rate. Soaking of ferrous iron plate samples in seawater media have done for corrosion test. Agitator and aerator motors at turn-on and conducted a series of immersion with varying contact time 5, 10, 15, and 20 days. After the time up next ferrous iron plate samples were cleaned, dried, and weighed. Experiment was repeated by adding a inhibitor heavy leaves gambier extract with varying leaves gambier extract, 1000, 3000, and 5000 ppm. Soaking iron plate samples performed at varying pH at 3(acid), 6 (netral), and 9 (alkaline). Calculation is then performed and the rate of corrosion inhibition efficiency gambier leaves extract with ethanol-water solvent. On the immersion of iron plate without inhibitor, the result that the longer the contact time, the weight of the iron plate was reduced. The results showed the addition of inhibitors of leaves extract gambier with ethanol-water solvent into the corrosive media can reduce the rate of corrosion. Inhibitor of leaves extract gambier using ethanol-water solvent effective to reduce the rate of corrosion inhibitor at a concentration of 5000 ppm and contact time of 20 days with the lowest value of the corrosion rate is 0.000503 g/cm2 days in seawater media at initial pH 7.9. Gambier extracts gave greatest inhibition efficiency about 60.345% obtained at a concentration of 5000 ppm inhibitor and 20 days contact time.

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