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.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | LA-ICP-MS of magnetite: Methods and reference materials |
| Series title | Journal of Analytical Atomic Spectrometry |
| DOI | 10.1039/c1ja10105f |
| Volume | 26 |
| Issue | 9 |
| Year Published | 2011 |
| Language | English |
| Publisher | Royal Society of Chemistry |
| Description | 6 p. |
| First page | 1872 |
| Last page | 1877 |
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