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The determination of the oxidation state of iron by the electron microprobe

Heidi E. Hoefer, Gerhard P. Brey, Burkhard Schulz-Dobrick and Roland Oberhaensli
The determination of the oxidation state of iron by the electron microprobe
European Journal of Mineralogy (June 1994) 6 (3): 407-418


The long-standing problem of determining the Fe (super 2+) /Fe (super 3+) ratios by EPMA can be solved by analysing the FeL (sub alpha) and FeL (sub beta) X-ray emission spectra. The ratios of intensities are measured on the high energy flank of the L (sub alpha) and the low energy flank of the L (sub beta) peak. The sensitivity achieved with this 'flank method' is 3-4 times higher than the peak shift or peak intensity ratio methods. This method was calibrated using wustite, magnetite and hematite and then applied to a synthetic magnetite-hercynite solid solution series and several natural olivines. The results obtained by the flank method vary not only with Fe (super 3+) but also with total iron content. A quantitative method for determining the oxidation state of iron must therefore not only be based on a high-resolution method but must also include corrections for self-absorption and matrix effects. The flank method can be applied where the bulk composition and crystal structure of the mineral is known and working curves are available or have been established for similar materials.

ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 6
Serial Issue: 3
Title: The determination of the oxidation state of iron by the electron microprobe
Affiliation: Max-Planck-Institut fuer Chemie, Mainz, Federal Republic of Germany
Pages: 407-418
Published: 199406
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 25
Accession Number: 1995-009777
Categories: General mineralogy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables
Secondary Affiliation: Institut fuer Geowissenschaften der Universitaet Mainz, DEU, Federal Republic of Germany
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 199504
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