| Autor: |
Smirnova, E. V., Fedorova, I. N., Sandimirova, G. P., Petrov, L. L., Lozhkin, V. I. |
| Předmět: |
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| Zdroj: |
Journal of Analytical Chemistry; Jun2003, Vol. 58 Issue 6, p533-541, 9p |
| Abstrakt: |
The accuracy of the results of analysis by inductively coupled plasma mass spectrometry (ICP-MS) was studied for the determination of rare-earth elements in black shales rich with a carbonaceous organic substance of a different nature: biogenic (samples SChS-1 and SLg-1, which were put through certification studies at the Institute of Geochemistry, Siberian Division, Russian Academy of Sciences) and bituminous (SDO-1 and SGR-1, reference samples of the US Geological Survey). Based on the comparison of the results obtained by ICP MS with the reference data for SChS-1 and SLg-1 shales, it was found that the systematic error depends on the procedure of sample decomposition: in open systems (A), in autoclaves (B), and by fusion with lithium metaborate (C). In decomposition procedures A and B, the underestimation of results was observed for heavy rare-earth elements (Gd–Lu): up to 60–80% in the open decomposition of samples and up to 30–40% in the decomposition in an autoclave; these errors cannot be eliminated by preliminary calcination of samples, and only the use of procedure C provides the smallest deviations between the found and reference concentrations. The behavior of rare-earth elements in the analysis of SDO-1 and SGR-1 shales differs from their behavior in the analysis of SChS-1 and CLg-1: systematic errors were not revealed when the above decomposition procedures were used. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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