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标题：ECONOMIC AND ACCURATE CHROMIUM DETERMINATION VIA MODELING AND MONITORING THE REMOVAL OF ADSORBED HEXAVALENT CHROMIUM BY LEAST COST ORGANIC WASTES AND THE OPTIMIZATION OF FLAME ATOMIC ABSORPTION SPECTROPHOTOMETER (FAAS)
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作者：Muhammad Jamil Khan ; Thomas Hugh Flower ; Hussani Mubarak 等
期刊名称：Fresenius Environmental Bulletin
印刷版ISSN：1018-4619
出版年度：2019
卷号：28
期号：1
页码：5-14
语种：English
出版社：PSP Publishing
摘要：The efficiency of non-conventional, least cost organic wastes (OWs), for chromium adsorption, was investigated through batch experiment. Organic wastes (OWs) such as, pine bark (PB), garden peat (GP), fresh ash (FA), coconut shell (CS) and coconut fiber (CF), compared with the blank (control), were used as filter beds for chromium Cr(VI) adsorption. Langmuir and Freundlich isotherm models for Cr(VI) adsorption by OWs, were analyzed. Statistically, highly significant (P ≤ 0.01) differences in Cr(VI) adsorption by OWs were revealed. The efficiency of adsorbents was in the order of PB > GP > FA > CS > CF. Amongst all, the highest adsorption was by pine bark (98%) followed by garden peat (96%). For highest accuracy of Cr(VI) analysis, by flame atomic absorption spectrophotometer (FAAS), and a step towards energy and economy conservation, the flame composition of agitation gas (ethylene gas (C_2H_2)) of FAAS, was evaluated for optimization. Calculation of ethylene consumption serving as additional fuel, in Cr(VI) determination per treatment, revealed that at higher flow rates, C_2H_2 had no impact on Cr(VI) determination. Thus, to avoid and terminate the effect and wastage of C_2H_2, the flame composition of agitation gas was recommended to be optimized.
关键词：Cr(VI);least cost - agriculture wastes;filter bed;adsorption;adsorption isotherm;ethylene;flame atomic absorption spectrophotometer (FAAS)