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Issue 9, 2011
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LA-ICP-MS of magnetite: methods and reference materials

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Abstract

Magnetite (Fe3O4) is a common accessory mineral in many geologic settings. Its variable geochemistry makes it a powerful petrogenetic indicator. Electron microprobe (EMPA) analyses are commonly used to examine major and minor element contents in magnetite. Laser ablation ICP-MS (LA-ICP-MS) is applicable to trace element analyses of magnetite but has not been widely employed to examine compositional variations. We tested the applicability of the NIST SRM 610, the USGS GSE-1G, and the NIST SRM 2782 reference materials (RMs) as external standards and developed a reliable method for LA-ICP-MS analysis of magnetite. LA-ICP-MS analyses were carried out on well characterized magnetite samples with a 193 nm, Excimer, ArF LA system. Although matrix-matched RMs are sometimes important for calibration and normalization of LA-ICP-MS data, we demonstrate that glass RMs can produce accurate results for LA-ICP-MS analyses of magnetite. Cross-comparison between the NIST SRM 610 and USGS GSE-1G indicates good agreement for magnetite minor and trace element data calibrated with either of these RMs. Many elements show a sufficiently good match between the LA-ICP-MS and the EMPA data; for example, Ti and V show a close to linear relationship with correlation coefficients, R2 of 0.79 and 0.85 respectively.

Graphical abstract: LA-ICP-MS of magnetite: methods and reference materials

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Publication details

The article was received on 21 Mar 2011, accepted on 24 May 2011 and first published on 16 Jun 2011


Article type: Technical Note
DOI: 10.1039/C1JA10105F
Citation: J. Anal. At. Spectrom., 2011,26, 1872-1877
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    LA-ICP-MS of magnetite: methods and reference materials

    P. Nadoll and A. E. Koenig, J. Anal. At. Spectrom., 2011, 26, 1872
    DOI: 10.1039/C1JA10105F

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