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Coprecipitation as a means of separation in substoichiometric isotope dilution analysis

II. The determination of chromium

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Abstract

Chromium has been determined by isotope dilution in artificial standards and in standard alloys using the substoichiometric principle. As a substoichiometric reaction the reduction of Cr(VI) to Cr(III) was used, followed by separation of these species by coprecipitation of the trivalent chromium on a Ti(OH)4 precipitate. For amounts smaller than 1 μg the standard method had to be modified owing to spontaneous reduction of hexavalent chromium in the solution. Interferences from other metals, if they occur, can be easily overcome. The method is simple and inexpensive.

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Authors and Affiliations

  1. Laboratory for Analytical Chemistry, University of Amsterdam, Amsterdam, The Netherlands

    H. L. Polak, H. de Groot & E. E. Challa

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  1. H. L. Polak
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  2. H. de Groot
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  3. E. E. Challa
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Polak, H.L., de Groot, H. & Challa, E.E. Coprecipitation as a means of separation in substoichiometric isotope dilution analysis. J. Radioanal. Chem. 13, 319–327 (1973). https://doi.org/10.1007/BF02513922

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  • DOI: https://doi.org/10.1007/BF02513922

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