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Preconcentration and separation of Cr(III) and Cr(VI) using sawdust as a sorbent

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Abstract

A simple, inexpensive method based on solid-phase extraction (SPE) on sawdust from Cedrus deodera has been developed for speciation of Cr(III) and Cr(VI) in environmental water samples. Because different exchange capacities were observed for the two forms of chromium at different pH—Cr(III) was selectively retained at pH 3 to 4 whereas Cr(VI) was retained at pH 1—complete separation of the two forms of chromium is possible. Retained species were eluted with 2.5 mL 0.1 mol L−1 HCl and 0.1 mol L−1 NaOH. Detection limits of 0.05 and 0.04 μg mL−1 were achieved for Cr(III) and Cr(VI), respectively, with enrichment factors of 100 and 80. Recovery was quantitative using 250 mL sample volume for Cr(III) and 200 mL for Cr(VI). Different kinetic and thermodynamic properties that affect sorption of the chromium species on the sawdust were also determined. Metal ion concentration was measured as the Cr(VI)–diphenylcarbazide complex by UV–visible spectroscopy. The method was successfully applied for speciation of chromium in environmental and industrial water samples.

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Authors and Affiliations

  1. Center of Excellence in Analytical Chemistry, University of Sindh, Jamshoro, Pakistan

    Saima Q. Memon & M. I. Bhanger

  2. M. A. Kazi Institute of Chemistry, University of Sindh, Jamshoro, Pakistan

    M. Y. Khuhawar

Authors
  1. Saima Q. Memon
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  2. M. I. Bhanger
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  3. M. Y. Khuhawar
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Correspondence to Saima Q. Memon.

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Memon, S.Q., Bhanger, M.I. & Khuhawar, M.Y. Preconcentration and separation of Cr(III) and Cr(VI) using sawdust as a sorbent. Anal Bioanal Chem 383, 619–624 (2005). https://doi.org/10.1007/s00216-005-3391-1

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  • DOI: https://doi.org/10.1007/s00216-005-3391-1

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