Speciation of chromium in water using crosslinked chitosan-bound FeC nanoparticles as solid-phase extractant, and determination by flame atomic absorption spectrometry |
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Authors: | Yiwei Wu Yinyan Jiang Deyan Han Fang Wang Junxia Zhu |
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Institution: | (1) Hubei Key Laboratory of Bioanalytical Techniques, Hubei Normal University, 435002 Huangshi, P.R. China;(2) Department of Chemistry and Environmental Engineering, Hubei Normal University, 435002 Huangshi, P.R. China |
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Abstract: | Crosslinked chitosan-bound FeC nanoparticles (CCBFeCNP) were prepared, and the adsorptive behavior of Cr(III) and Cr(VI) on
CCBFeCNP were assessed. At pH 6.0–10.0, CCBFeCNP is selective towards Cr(III) but hardly selective towards Cr(VI). The retained
Cr(III) is subsequently eluted with 0.5 mol L−1 HCl. Total chromium is determined after reduction of Cr(VI) to Cr(III) by ascorbic acid. A new method of flow injection using
a micro-column packed with CCBFeCNP as solid phase extractant has been developed for speciation of Cr(III) and Cr(VI) in water
samples, followed by flame atomic absorption spectrometry. The effects of pH, sample flow rate and volume, elution solution
and interfering ions on the recoveries of Cr(III) were systematically investigated. Under optimum conditions, the adsorption
capacity of CCBFeCNP for Cr(III) is 10.5 mg g−1 at pH 7.5. The procedure presented was applied to chromium speciation in water samples, and the results were satisfactory. |
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Keywords: | : Solid phase extraction nanoparticles chitosan-bound speciation chromium FAAS |
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