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Speciation of Cr(III) and Cr(VI) ions using a β-cyclodextrin-crosslinked polymer micro-column and graphite furnace atomic absorption spectrometry

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Abstract

A sensitive and selective method for the speciation of Cr(III) and Cr(VI) in water samples was developed. It is based on the selective binding of the complex formed between Cr(III) and 4-(2-pyridylazo)resorcinol adsorbed on a cross-linked polymer modified with β-cyclodextrin and placed in a micro-column. Graphite furnace atomic absorption spectrometry (GFAAS) was used to quantify chromium. Cr(VI) ion is not adsorbed but remains in the aqueous sample phase. Thus, an in-situ separation of Cr(VI) and Cr(III) is accomplished. The concentration of Cr (VI) was calculated by subtracting the value for Cr(III) from that for total chromium. Under optimum conditions, the limit of detection of Cr(III) is 0.056 μg L−1, and the linear range is from 2.0 to 160.0 μg L−1. The relative standard deviation is 2.5% (n = 3, at 30.0 μg L−1). The preconcentration factor is 25. The method was applied to the speciation of chromium in water samples, and recoveries in spiked real samples range from 101.9% to 104.5%. A reference water sample (GBW(E)080642) also was analyzed, and the results were in good agreement with the certified values.

The quantitative adsorption (≥90%) on the β-CDCP for Cr(III) was found in the range of the pH 5.5–6.0, whereas the adsorption efficiency for Cr(VI) at this pH range was rather low.

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Acknowledgements

The authors acknowledge the financial support from the National Natural Science Foundation of China (20875082) and the Foundation of Excellence Science and Technology Invention Team in the Yangzhou University

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  1. College of Chemistry & Chemical Engineering, Yangzhou University, Yangzhou, 225009, China

    Ying Gu & Xiashi Zhu

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  1. Ying Gu
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  2. Xiashi Zhu
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Correspondence to Xiashi Zhu.

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Gu, Y., Zhu, X. Speciation of Cr(III) and Cr(VI) ions using a β-cyclodextrin-crosslinked polymer micro-column and graphite furnace atomic absorption spectrometry. Microchim Acta 173, 433–438 (2011). https://doi.org/10.1007/s00604-011-0578-3

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  • DOI: https://doi.org/10.1007/s00604-011-0578-3

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