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Kinetic spectrophotometric determination of iron oxidation states in geological materials

  • Original Papers
  • Inorganic And Geological Material
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Summary

A kinetic spectrophotometric approach is applied to the determination of iron oxidation states in geological materials. Silicate rock samples were sealed in a Teflon vial under argon atmosphere and were decomposed with a mixture of hydrofluoric acid and sulphuric acid by the microwave digestion technique. The absorbance of iron(III)-Tiron complex was followed at 560 nm and the absorbance/time relation was analyzed by non-linear least squares fitting. The FeO and Fe2O3 determinations in silicate rocks by the proposed kinetic method agree with those done by the static o-phenanthroline method. The analytical results for standard igneous rock samples are compared with published data.

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Authors and Affiliations

  1. Department of Materials Science and Engineering (Applied Chemistry Section), Yamagata University, 992, Yonezawa, Japan

    Masatoshi Endo, Isamu Sasaki & Shigeki Abe

Authors
  1. Masatoshi Endo
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  2. Isamu Sasaki
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  3. Shigeki Abe
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Endo, M., Sasaki, I. & Abe, S. Kinetic spectrophotometric determination of iron oxidation states in geological materials. Fresenius J Anal Chem 343, 366–369 (1992). https://doi.org/10.1007/BF00322872

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  • DOI: https://doi.org/10.1007/BF00322872

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