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Journal of Applied Chemical Science
Published by JACSONLINE
ISSN : -     EISSN : -     DOI : -
Core Subject : Science, Engineering,
Chemical Engineering, Chemistry & Bioengineering Chemistry
Arjuna Subject : -
Articles 4 Documents
 1 
Search results for , issue "Volume 1, No. 2 , 2012" : 4 Documents clear
Determination of Lead by the Electrothermal Atomic Absorption Spectrometry in a Candidate Reference Material of Fish Meal Using Chemical Modifiers Suwari; H. R. Hadiman; Tahid
Journal of Applied Chemical Science Volume 1, No. 2 , 2012
Publisher : Journal of Applied Chemical Science

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Abstract

Different chemical modifiers for the determination of lead by the electrothermal atomic absorption spectrometry (ETAAS) in a candidate reference material of fish meal matrix were studied. The optimal pyrolysis and atomizing temperatures (TP and TA) of lead obtained by adding modifiers, lanthanum nitrate, magnesium nitrate, and ammonium dihydrogen phosphate ,were (750 and 2300 oC), (600 and 2000 oC) and (650 and 2200 oC), respectively, whereas the TP and TA of the lead without modifier were 450 and 2000 oC, respectively. Performance test of the chemical modifiers are based on dynamic range, characteristic mass, limit of detection, precision, accuracy, sample recovery, and repeatability. The experiment without modifier was carried out as control of the performance. The performance of analytical procedures by adding ammonium dihydrogen phosphate modifier were found that 0.2 - 2.0 ng of the dynamic range, 19 pg of characteristic mass, 16 pg of limit of detection, 3.45 % of precision, 98 ± 3% of sample recovery, and 0.04 ± 0.01 μg/g of repeatability . The application result of the method for the determination of fish meal matrix 0.87 ± 0.03 μg/g of lead. The accuracy of the proposed method was verified by analyzing the certified reference material, cod muscle, BCR CRM 422 and the result was 0.092±0.008 which is almost similar with its certified value, 0.085±0.015. These results indicated that ammonium dihydrogen phosphate is the best choice modifier compared to the other in all aspects cited above.
Thermal Degradation of PVC & Mixed Waste Plastics to Produce Mixture of Hydrocarbon Fuel Moinuddin Sarker; Mohammad Mamunor Rashid; Muhammad Sadikur Rahman ; Mohammed Molla
Journal of Applied Chemical Science Volume 1, No. 2 , 2012
Publisher : Journal of Applied Chemical Science

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Abstract

Experiments of combination waste plastics such as High Density Polyethylene (HDPE), Low Density Polyethylene (LDPE), Polypropylene (PP) and Polyvinyl Chloride (PVC) were carried out in a steel reactor. The thermal cracking process was carried out in temperature range of 150 ºC to 400 ºC. The principle process products are gaseous and liquid hydrocarbon fractions similar to refinery cracking products. The solid carbon residue of around 8 to 9 % of the total raw materials are similar to coal cokes and contains higher mineral contents than the other two products. Upon further analysis using gas chromatography and Mass spectrometer (GC/MS) and furrier transform infrared spectroscopy (FT-IR) of the liquid hydrocarbon fraction showed similar chemical properties to commercial gasoline and diesel products. The similarity was in the distribution of carbon chains and alkane groups. Analysis using differential scanning calorimeter (DSC) showed the calorific value is comparable as well. The thermal degradation process was shown to be efficient because it was able to convert PVC, which contains 56% chlorine to hydrocarbon products. Specific analysis was done for the identification of chlorine in the liquid hydrocarbon products, and results have shown that the liquid hydrocarbon products contained lower chlorine content than standard chlorine level allowed by EPA. Further research is being conducted on capturing and categorizing the gaseous component and the results will be submitted on the subsequent scientific papers.
The Active Fractions from Ethanol Extracts of Gracilaria Coronopifolia J Agardh Are Potential Free Radical Scavenging Agents I Made Dira Swantara; Sagung Chandra Yowani ; Osamu Iitsuka
Journal of Applied Chemical Science Volume 1, No. 2 , 2012
Publisher : Journal of Applied Chemical Science

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Abstract

Six compounds in one fraction of seaweed Gracilaria coronopifolia (Red algae) that have radicalscavenging activity have been identified. Extraction of those compounds was carried out by maceration method using 96% ethanol. Separation and purification of the fraction were performed by liquid-liquid partition and column chromatographic methods. The obtained fractions were treated with 2,2-diphenyl-1- picrylhydrazyl and found that their radical-scavenging activities of the first (A) and the second (B) fractions from the column with a 60 min retention time were 83.12% and 90.72%, respectively. The compounds contained in the A and B fractions identified by GC-MS were 1-nonadecene; hexadecanoic acid or palmitic acid; octadec-9-enoic acid; cholesta-4,6-dien-3β-ol; cholest-5-en-3β-ol or cholesterol; and cholest-4-en-3- one. These compounds could be expected to have radical scavenging activities.
The Moringa Seed (Moringa oleifera, L.) Extracts Potentially Reduce the Effects of Clothes Washing Wastewater on Growth of Green Beans (Vigna radiata) Merymistika Y. Afred; Bibiana D. Tawa; Pius D. Ola
Journal of Applied Chemical Science Volume 1, No. 2 , 2012
Publisher : Journal of Applied Chemical Science

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Abstract

A study concerning the use of Moringa seed (Moringa oleifera, L.) extracts to reduce the influence of clothes washing wastewater on growth of green bean (Vigna Radiata) has been conducted. The study aimed to determine the effective dose of coagulants prepared from moringa seed extracts (400, 600, 800, 1000, and 2000 mg/L) on germination of green beans in wastewater. The results showed that the optimum dose of coagulant was 2000 mg/L. The treatments with various doses of coagulants indicated significantly different except for the dose of 1000 mg/L and 2000 mg/L (P < 0.05). The stem height and leaf watering with coagulant water were 25.9 cm and 14.1 cm2, respectively, while by the tap water were 24.3 cm and 10.99 cm2, respectively. Those results conclusively indicated that the water coagulant prepared from moringa seed extracts promotes growth of the vigna radiata.

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