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X-ray fluorescence determination of the FeO/Fe2O tot3 ratio in rocks

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Abstract

Chances for estimating the FeO/Fe2O tot3 ratio in rocks by the K and L series of X-ray fluorescence spectra are studied. The errors in the determination of FeO/Fe2O tot3 by the intensity ratio of the Kβ2,5/Kβ1,3 and Lβ/Lα1,2 lines are compared. The relative standard deviation of determining FeO using a set of 49 standard samples of eruptive rocks varies in the range 5–16%, depending on the ratio FeO/Fe2O tot3 and the concentration of FeO. The better precision is attainable for a ratio above 0.45 at a FeO concentration in the range 5–15%. For samples of andesites and basalts, the relative standard deviation is better than 4%, for rocks of the granite family it is 23% at FeO concentrations below 3%. For samples of metamorphic and sedimentary rocks, the error of FeO determination is higher than that for the eruptive ones. For samples with the ratio FeO/Fe/Fe2O tot3 < 0.25, the deviation may exceed 30 rel %. In contrast to chemical analysis, the X-ray fluorescence method appears advantageous in time and cost of sample preparation and can be used for routine analysis in geochemical research.

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Authors and Affiliations

  1. Vinogradov Institute of Geochemistry, Siberian Branch, Russian Academy of Sciences, ul. Favorskogo 1a, Irkutsk, 664033, Russia

    V. M. Chubarov & A. L. Finkel’shtein

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  1. V. M. Chubarov
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  2. A. L. Finkel’shtein
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Original Russian Text © V.M. Chubarov, A.L. Finkel’shtein, 2010, published in Zhurnal Analiticheskoi Khimii, 2010, Vol. 65, No. 6, pp. 634–641.

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Chubarov, V.M., Finkel’shtein, A.L. X-ray fluorescence determination of the FeO/Fe2O tot3 ratio in rocks. J Anal Chem 65, 620–627 (2010). https://doi.org/10.1134/S1061934810060122

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  • DOI: https://doi.org/10.1134/S1061934810060122

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