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Issue 11, 2001
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SIMS ionization of hydrogen in silicates: a case study of kornerupine

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H/Si ionization in kornerupine, an (Mg, Al)-rich silicate mineral, has been investigated. There are significant variations (about 30% rel.) in the relative-to-Si ion yield for H [IY(H/Si)] as a function of chemical composition of the matrix kornerupine: ∼38–45 wt% Al2O3, ∼29–32 wt% SiO2, ∼15–20 wt% MgO, ∼0–11 wt% FeOtot, ∼2–4 wt% B2O3 and minor variations for the remaining components. There are strong correlations between IY(H/Si) and (Fe + Mn)(at) [where (at) represents the cation abundance in the sample (by atoms)] (r2 = 0.80); for Mg and Al(at), r2 = 0.73 and 0.90, respectively. The absolute ion yield for H [IY(H)] is strongly correlated with (Fe + Mn)- and Si(at) (r2 = 0.92 and 0.94, respectively). It is possible to make adequate corrections to IY(H/Si) as a function of sample composition to obtain accurate H2O (wt%) concentrations, reducing (if not overcoming) the need for specific standards (in most cases unavailable) that match the chemical composition of the sample. A model is proposed for H ionization in this matrix. The present outcome is qualitatively similar to the results obtained for other silicates (schorl, foitite, dravite, axinite, amphibole) and represents a valid basis for modelling SIMS ionization of H in silicates.

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Publication details

The article was received on 28 Jun 2001, accepted on 07 Sep 2001 and first published on 19 Oct 2001

Article type: Paper
DOI: 10.1039/B105674N
Citation: J. Anal. At. Spectrom., 2001,16, 1266-1270

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    SIMS ionization of hydrogen in silicates: a case study of kornerupine

    L. Ottolini and F. C. Hawthorne, J. Anal. At. Spectrom., 2001, 16, 1266
    DOI: 10.1039/B105674N

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