Speciation, selective extraction and preconcentration of chromium ions via alumina-functionalized-isatin-thiosemicarbazone

A method is presented and described for speciation, extraction and preconcentration of Cr(III) and Cr(VI) based on dynamic and static solid phase extraction techniques. Three newly designed alumina phases-physically adsorbed-isatin-thiosemicarbazone (I–III) were synthesized, characterized, tested fo...

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Bibliographic Details
Published in:Journal of hazardous materials 2008-10, Vol.158 (2), p.541-548
Main Authors: Mahmoud, Mohamed E., Yakout, Amr A., Ahmed, Somia B., Osman, Maher M.
Format: Article
Language:English
Subjects:
Alumina
Aluminum Oxide - chemistry
Applied sciences
Chemical engineering
Chromium
Chromium - chemistry
Exact sciences and technology
Ion exchange
Isatin - chemistry
Isatin-thiosemicarbazone
Pollution
Solid-phase extraction
Speciation
Spectrophotometry, Infrared
Thiosemicarbazones - chemistry
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Summary:A method is presented and described for speciation, extraction and preconcentration of Cr(III) and Cr(VI) based on dynamic and static solid phase extraction techniques. Three newly designed alumina phases-physically adsorbed-isatin-thiosemicarbazone (I–III) were synthesized, characterized, tested for stability and applied as inorganic ion exchangers and chelating solid sorbents for various metal ions. The selectivity characteristics incorporated into these alumina phases were studied and evaluated via determination of the distribution coefficients and separation factors of chromium species versus other interacting metal ions. Quantitative recovery of Cr(VI) was accomplished by alumina phases (I–III) in pH 1.0 giving percentage extraction values of ∼99.9–100.0%, while Cr(III) was found to be quantitatively recovered by these sorbents in pH 7.0 leading to percentage extraction values ∼100.0% with minimal or no interference between these two species under the studied buffering conditions. Selective solid phase speciation and preconcentration of Cr(III) and Cr(VI) in various real water samples were successfully performed and accomplished by newly designed alumina phases (I–III) via a preconcentration micro-column.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2008.01.114