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Please use this identifier to cite or link to this item: http://repository.li.mahidol.ac.th/dspace/handle/123456789/20115
Title: Continuous-flow extraction system for elemental association study: A case of synthetic metal-doped iron hydroxide
Authors: Duangduean Hinsin
Laddawan Pdungsap
Juwadee Shiowatana
Mahidol University
Keywords: Chemistry
Issue Date: 6-Dec-2002
Citation: Talanta. Vol.58, No.6 (2002), 1365-1373
Abstract: A continuous-flow extraction system originally developed for sequential extraction was applied to study elemental association of a synthetic metal-doped amorphous iron hydroxide phase. The homogeneity and metal association of the precipitates were evaluated by gradual leaching using the system. Leachate was collected in fractions for determination of elemental concentrations. The result obtained as extractograms indicated that the doped metals were adsorbed more on the outermost surface rather than homogeneously distributed in the precipitates. The continuous-flow extraction method was also used for effective removal of surface adsorbed metals to obtain a homogeneous metal-doped synthetic iron hydroxide by a sequential extraction using acetic acid and small volume of hydroxylamine hydrochloride solution. The system not only ensures complete washing, but the extent of metal immobilization in the synthetic iron hydroxide could be determined with high accuracy from the extractograms. The initial metal/iron mole ratio (M/Fe) in solution affected the M/Fe mole ratio in homogeneous doped iron hydroxide phase. The M/Fe mole ratio of metal incorporation was approximately 0.01-0.02 and 0.03-0.06, for initial solution M/Fe mole ratio of 0.025 and 0.100, respectively. © 2002 Elsevier Science B.V. All rights reserved.
URI: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0038375020&origin=inward
http://repository.li.mahidol.ac.th/dspace/handle/123456789/20115
ISSN: 00399140
Appears in Collections:Scopus 2001-2005

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