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Speciation analysis of chromium in natural water samples by electrothermal atomic absorbance spectrometry after separation/preconcentration with nanometer-sized zirconium oxide immobilized on silica gel

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Abstract.

Silica gel was prepared by the sol–gel method, modified with nanometer-sized zirconium oxide, and this material was characterized by X-ray diffraction. A micro-column packed with silica gel modified with nanometer zirconium oxide as sorbent has been developed for the quantitative separation and preconcentration of trace amounts of chromium(III) prior to their determination by electrothermal atomic absorption spectrometry. Total chromium was determined after the reduction of chromium(VI) to chromium(III) by 10% (m/v) of aqueous ascorbic acid as reducing reagent. The adsorption capacity for chromium(III) was found to be 2.36 mg g−1. The detection limit for chromium(III) was 15 ng L−1 with an enrichment factor of 100. The relative standard deviation was 3.2% (n = 7, c = 2.0 ng mL−1).

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Authors and Affiliations

  1. Department of Chemistry, Shanxi Normal University, 041004, Linfen, PR China

    Yinzhe Ren, Zhefeng Fan & Jianying Wang

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  1. Yinzhe Ren
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  2. Zhefeng Fan
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  3. Jianying Wang
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Correspondence to Zhefeng Fan.

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Ren, Y., Fan, Z. & Wang, J. Speciation analysis of chromium in natural water samples by electrothermal atomic absorbance spectrometry after separation/preconcentration with nanometer-sized zirconium oxide immobilized on silica gel. Microchim Acta 158, 227–231 (2007). https://doi.org/10.1007/s00604-006-0680-0

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  • DOI: https://doi.org/10.1007/s00604-006-0680-0

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