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DETERMINATION OF SULFUR IN SRM BAUXITE AND SEDIMENT SAMPLES BY ISOTOPE DILUTION THERMAL IONIZATION MASS SPECTROMETRY
Author(s) -
KELLY W. Robert,
MURPHY K.E.
Publication year - 1992
Publication title -
geostandards newsletter
Language(s) - English
Resource type - Journals
eISSN - 1751-908X
pISSN - 0150-5505
DOI - 10.1111/j.1751-908x.1992.tb00479.x
Subject(s) - isotope dilution , bauxite , sediment , chemistry , sulfur , mass spectrometry , analytical chemistry (journal) , dry weight , thermal ionization mass spectrometry , environmental chemistry , ionization , chromatography , geology , geomorphology , ion , botany , organic chemistry , biology
The sulfur concentration has been determined in five bauxite and two sediment NIST Standard Reference Materials (SRM) by isotope dilution thermal ionization mass spectrometry (ID‐TIMS). Two outside laboratories had indicated that the original certified values in the bauxites SRMs were too high by as much as 93 percent. The ID‐TIMS determinations reported here confirm that the certified values on all bauxites contained a positive bias. The sulfur concentrations obtained in this study are the following (in μgS/g, dry weight basis): SRM 69b ‐ 2208 ± 25, SRM 696 ‐ 601 ± 8, SRM 697 ‐ 308 ± 7, SRM 698 ‐ 575 ± 16 and SRM 600 ‐ 622 ± 24. The values for the sediment samples are the following (in weight percent sulfur dry weight basis): SRM 2704 ‐ 0.3970 ± 0.0039 and SRM 1941 ‐ 1.717 ± 0.016.