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Accuracy of ferric/ferrous determinations in micas: A comparison of Mössbauer spectroscopy and the Pratt and Wilson wet-chemical methods

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Abstract

We compare ferric/ferrous determinations in mica granules and powders, as obtained by the Pratt and Wilson wet chemical (WC) methods and by Mössbauer spectroscopy (MS). The Pratt method is accurate whereas the Wilson method is not but both have the same precision (σ = 1.2 wt.% FeO). Assuming that the Pratt WC method gave accurate ferric/ferrous ratios leads to a calculated ferric/ferrous ratio of MS recoilless fractions at room temperature for a given biotite sample of f 3+/f 2+ = 1.009(5). Also, the Mica-Fe and Mica-Mg international standards are shown to be unsuitable, with significant size-fraction dependencies of their oxidation states. These results are discussed in the general context of evaluating accuracy and precision of WC methods by comparisons with MS and of the special problems related to accuracy and precision with MS itself.

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Authors and Affiliations

  1. Ottawa-Carleton Geoscience Centre, Department of Earth Sciences, University of Ottawa, Ottawa, Ontario, Canada, K1N 6N5

    A.E. Lalonde

  2. Department of Materials Physics, University of Science and Technology, Beijing, PR China

    J.Y. Ping

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  1. A.E. Lalonde
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  2. D.G. Rancourt
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  3. J.Y. Ping
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Lalonde, A., Rancourt, D. & Ping, J. Accuracy of ferric/ferrous determinations in micas: A comparison of Mössbauer spectroscopy and the Pratt and Wilson wet-chemical methods. Hyperfine Interactions 117, 175–204 (1998). https://doi.org/10.1023/A:1012607813487

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