Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
582086 | Journal of Hazardous Materials | 2009 | 6 Pages |
Abstract
A simple and sensitive method based on solid phase extraction (SPE) on acetyl acetone modified XAD-16 has been established for separation of Cr (III) and Cr (VI) from and industrial water samples. Two forms of chromium showed different exchange capacities at different pH values, viz. Cr (III) selectively retained at pH 5-7 whereas Cr (VI) retained at pH 1. Hence complete separation of the two forms of chromium is possible. Retained species were eluted with 5 mL of 2 mol Lâ1 HNO3 and 2 mol Lâ1 NaOH. The detection limit of 0.02 and 0.014 μg mLâ1 was achieved for Cr (III) and Cr (VI), respectively, with an enrichment factor of 100 and 140. Various kinetic and thermodynamic parameters were also determined. The metal ion concentration was measured by atomic Absorption Spectroscopy. The possible retention mechanism is also discussed. The method was successfully applied for the speciation of chromium in industrial water samples.
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Authors
Jamil-ur-Rahman Memon, Saima Q. Memon, M.I. Bhanger, M.Y. Khuhawar,