期刊
GEOSTANDARDS AND GEOANALYTICAL RESEARCH
卷 31, 期 3, 页码 185-197出版社
WILEY-BLACKWELL
DOI: 10.1111/j.1751-908X.2007.00859.x
关键词
ultramafic rocks; rare earth elements; spectral interference; geochemical reference materials; quadrupole ICP-MS
We present a new method that determines precisely and accurately rare earth elements (REE) at the sub-ng g(-1) level in ultramafic rocks based on acid dissolution and quadrupole ICP-MS with systematic interference corrections on each sample. The method is demonstrated by analyses of the international geochemical reference materials, PCC-1 (peridotite), DTS-1 (dunite) and DTS-2 (dunite) provided by the United States Geological Survey (USGS), and JP-1 (peridotite) issued by the Geological Survey of Japan (GSJ). Detection limits, as rock equivalent, were calculated to be 0.01-0.08 ng g(-1) for our instrument, which is sufficiently low compared to the REE concentrations of ultramafic rocks. In addition, procedural blanks of the proposed method were 0.2-5 pg, which is negligible even for the ultra-low level REE determinations. Reproducibility obtained from separate dissolutions and measurements of USGS DTS-2 and GSJ JP-1 was 3-6%, which corresponds to the high-precision data obtained by ID-TIMS or magnetic sector field ICP-MS with a desolvating nebuliser. The REE data determined exhibit smooth chondrite-normalised REE patterns for all of the tested geochemical reference materials, and the abundances are in good agreement with recently published data.
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