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All Journal Journal of Applied Chemical Science Journal of Innovation in Teaching and Instructional Media Inteleksia: Jurnal Pengembangan Ilmu Dakwah
Suwari
Department of Chemistry Faculty of Science and Engineering, Nusa Cendana University
Religion Humanities Chemical Engineering, Chemistry & Bioengineering Chemistry Education Languange, Linguistic, Communication & Media Social Sciences Other

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Journal : Journal of Applied Chemical Science

 1 
The Sulphur Dioxide (SO2) Gas and the Total Suspended Particulate Contents of the Ambient Air of Kupang City: Case Report Welem A. Faot; Suwari; Sherlly Ledoh
Journal of Applied Chemical Science Volume 1, No. 1 , 2012
Publisher : Journal of Applied Chemical Science

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Abstract

A research has been done to find out the concentration of sulfur dioxide gas (SO2) and the total suspended particulate (TSP), as well as correlation between the amount of vehicle and the concentration of SO2 and TSP ambient air in subdistrict Oebobo of Kupang City. The measuring of SO2 using pararosaniline method, while the TSP was measured by using digital particle concentration meter. The results showed that the highest concentration of SO2 was found on Nangka Street (in the afternoon) that was 148.05 μg/Nm3 and the lowest was on Palapa Street (in the afternoon) that was 106.55 μg/Nm3. The highest concentration of TSP was recorded from the Amabi Street (in the morning) which was 49.50 μg/Nm3 and the lowest concentration was recorded from the Palapa Street (in the afternoon) was 17.95 μg/Nm3. There is a correlation between the amount of vehicle and concentration of SO2, and correlation between the amount of vehicle and concentration of TSP.
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
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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.
The Characteristics of Synthetic Chitosan Prepared from Snail Shells of Achatina Fulica Jacob A. Frans; Suwari; Luther Kadang
Journal of Applied Chemical Science Volume 2, No. 1 , 2013
Publisher : Journal of Applied Chemical Science

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A synthetic chitosan prepared from snail shells of achatina fulica has been done. The chitosan was yielded by the isolation stages that involved deproteinization, demineralization, and deacetylation that was by NaOH 3.5%, HCl 1 M, and 50% NaOH, respectively, and followed by determination of moisture content, ash content, viscosity, degree of deacetylation and functional groups. The moisture and ash contents were determined by a gravimetric method, the viscosity was by Ostwald instrument, while the degree of deacetylation and the functional groups were by FT-IR. The results showed that using those protocols provided 23.20% of chitosan content from the original snail shell material. The chitosan yielded had (in %) moisture and ash contents, viscosity, and degree of deacetylation were 0.24, 20.0, 198.3, and 68.5%, respectively. The functional group detected that involved –OH group was appeared at 3433.06 cm-1, while the -CH2- asymmetry and -CH2- symmetry were appeared at 2923.88 cm-1 and 2875.67 cm-1, respectively. The functional groups of -CH3-, C=O amide, and C-N aliphatic amines were appeared at 2979 cm-1, 1789.82 cm-1, and 1494.73 cm-1, respectively. The twin band of -NH2 was not found because of overlapping occurred between the -OH and-NH amine groups.
The Acid-Activated Sand Potentially Ameliorates Water Calcium Content Hermania Em Wogo; Yoseph J. Hema; Suwari
Journal of Applied Chemical Science Volume 2, No. 1 , 2013
Publisher : Journal of Applied Chemical Science

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The sand activation using three types of acids namely HNO3 0.1 M, H2SO4 1 M, and H3PO4 14 M have been done. The acid-activated sand was used as adsorbent of calcium ions (Ca2+) contained in hard water. The study was firstly determined the chemical contents of the sand using Energy Dispersive Xray Fluorescence instrument and followed by determination of the sand surface area using methylene blue and it’s surface acidity by titration. The experiment conducted with absence of the acid was carried out as an control. The results showed that the sand contained 47.95 % of SiO2 and 18.79% of Fe2O3. The highest surface area was found at the sample activated by H3PO4 14 M (27.73 m2/g). The surface area activated by H2SO4 1 M and HNO3 0.1 M were 26.56 and 25.59 m2/g, respectively. Highest surface acidity was found at the sample activated by H3PO4 14 M (299.60 µmol/gram), while those treated with H2SO4 1 M and HNO3 0.1M were 277.70 and 204.80 µmol/gram, respectively. That was, however, the sample without acid activation had surface acidity of 113.60 µmol/gram. Furthermore, the sand activated by H3PO4 14 M maximally absorbed 892.86 μmol Ca/g sand and those activated by H2SO4 1 M and HNO3 0.1M maximally absorbed 847.46 and 684.93 μmol Ca/g sand, respectively; whereas the sand without activation maximally absorbed 510.20 μmol Ca/g sand. Those results indicate that higher surface area higher surface acidity and higher capability of the calcium ion absorptions. Therefore, the acids-activated sand potentially reduces calcium ions content of hard water.
Utilization of Java Acid Seed (Tamarindus indica) Extract as a Coagulant in Tofu Waste Treatment Process: Short Communication Meri Letik; Luther Kadang; Suwari
Journal of Applied Chemical Science Volume 2, No. 1 , 2013
Publisher : Journal of Applied Chemical Science

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A study concerning the utilization of java acid seed (tamarindus indica) extract as a coagulant to be developed further for tofu wastewater treatment has been conducted. This study aimed to determine the optimum concentration of tamarind seed coagulant and to know the ability of the coagulant to reduce the concentration of total solid suspended (TSS), biochemical oxygen demand (BOD), chemical oxygen demand (COD) and amonia at optimum pH and temperature. In this study, jar-test method was used to confirm the effective dose of tamarind seed extract in reducing turbidity of the water samples analyzed. The applied concentrations of the seed extracts were 2000, 4000 and 6000 ppm. The results showed that the optimum dosage to reduce TSS, BOD and ammonia was 2000 mg/L and the COD was 4000 mg/L . At the optimum concentrations, the coagulant ameliorated up to 92.92% of BOD, 91.30% of COD, 83.34% of TSS, and 97.46% of ammonia levels and the water treated was found visually clear. Those results conclusively indicates that the coagulant made from the tamarind seed ameliorates effectively the BOD, COD, TSS, and ammonia contents as well as the turbidity levels of the water samples flowing from the tofu industry.
Co-Authors Dedy Pradesa H. R. Hadiman Hermania Em Wogo Jacob A. Frans Luther Kadang Meri Letik Sherlly Ledoh Tahid Welem A. Faot Yoseph J. Hema