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Trace analysis of toxic metals, III. Determination of chromium as trivalent chromium by differential pulse polarography

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Abstract

Methods for trace analysis of chromium as Cr3+ were investigated, using differential pulse polarography in various media. Determination at the ng/ml-μg/ml range can be carried out in KCl/HCl, KCNS/HOAc, and other media. Total concentration of chromium in a solution containing Cr3+ and HCrO −4 can be determined in KCNS/HOAc, and it is found that HCrO −4 can be converted quantitatively to Cr3+. The relative quantity of HCrO −4 and Cr3+ can be determined by the difference between the total chromium concentration and the concentration of HCrO −4 . The sensitivity (12.5 ng/ml) and accuracy of this method is better than the method that determines total chromium as HCrO −4 .

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Authors and Affiliations

  1. Department of Chemistry, National University of Singapore, Republic of Singapore

    Stephen A. K. Hsieh

  2. Department of Chemistry, City University of New York, 11210, Brooklyn, NY, USA

    T. S. Ma

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  1. Stephen A. K. Hsieh
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  2. T. S. Ma
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Hsieh, S.A.K., Ma, T.S. Trace analysis of toxic metals, III. Determination of chromium as trivalent chromium by differential pulse polarography. Mikrochim Acta 96, 167–174 (1988). https://doi.org/10.1007/BF01236101

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  • DOI: https://doi.org/10.1007/BF01236101

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