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Iodometric Amplification Method for the Determinations of Microgram Amounts of Manganese(II), Manganese(VII), Chromium(III) and Chromium(VI) in Aqueous Solution

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Abstract

A simple, rapid and sensitive iodometric amplification method has been developed for the determination of microgram amounts of MnII, MnVII, CrIII and CrVI. The method is based on the prereductions of MnVII and CrVI with Na2SO3, the oxidations of both MnII and CrIII in the absence of Na4P2O7 and the oxidation of only MnII in its presence with excess perio-date in acetate buffer (pH=3.0), removal of the unreacted periodate by masking with molybdate and the subsequent titra-tion of liberated iodine after adding iodide. The individual amounts of MnII, MnVII, CrIII and CrVI in different test solutions were successfully determined by this method, which offers 20-fold and 12-fold amplification for Mn and Cr, respectively.

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Authors and Affiliations

  1. Department of Chemistry, Central South University of Technology, Changsha, 410012, P. R. China

    Minghao Zhang & Guoping Zhan

  2. Department of Chemistry and Chemical Engineering, Hunan University, Changsha, P. R. China

    Zhanguang Chen

Authors
  1. Minghao Zhang
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  2. Guoping Zhan
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  3. Zhanguang Chen
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Zhang, M., Zhan, G. & Chen, Z. Iodometric Amplification Method for the Determinations of Microgram Amounts of Manganese(II), Manganese(VII), Chromium(III) and Chromium(VI) in Aqueous Solution. ANAL. SCI. 14, 1077–1083 (1998). https://doi.org/10.2116/analsci.14.1077

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  • DOI: https://doi.org/10.2116/analsci.14.1077

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