期刊
GEOSTANDARDS AND GEOANALYTICAL RESEARCH
卷 35, 期 2, 页码 253-273出版社
WILEY
DOI: 10.1111/j.1751-908X.2010.00099.x
关键词
basalt; resolution; laser ablation; ICP-MS; transition metals
资金
- NSF [EAR-0739006]
- NASA [NNX08AH76G]
- Maryland Nanocenter
- NISPLab
- NASA [NNX08AH76G, 101330] Funding Source: Federal RePORTER
- Directorate For Geosciences
- Division Of Earth Sciences [0739006] Funding Source: National Science Foundation
An in situ, medium-resolution LA-ICP-MS method was developed to measure the abundances of the first-row transition metals, Ga and Ge in a suite of geological materials, namely the MPI-DING reference glasses. The analytical protocol established here hinged on maximising the ablation rate of the ultraviolet (UV) laser system and the sensitivity of the ICP-MS, as well minimising the production of diatomic oxides and argides, which serve as the dominant sources of isobaric interferences. Non-spectral matrix effects were accounted for by using multiple external calibrators, including NIST SRM 610 and the USGS basaltic glasses BHVO-2G, BIR-1G and BCR-2G, and utilising 43Ca as an internal standard. Analyses of the MPI-DING reference glasses, which represent geological matrices ranging from basaltic to rhyolitic in composition, included measurements of concentrations as low as < 100 mu g g-1 and as high as > 104 mu g g-1. The new data reported here were found to statistically correlate with the 'preferred' reference values for these materials at the 95% confidence level, though with significantly better precision, typically on the order of < 3% (2s(m)). This analytical method may be extended to any matrix-matched geological sample, particularly oceanic basalts, silicate minerals and meteoritic materials.
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