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Improved thermal decomposition of sulfates to SO 2 and mass spectrometric determination of δ 34 S of IAEA SO‐5, IAEA SO‐6 and NBS‐127 sulfate standards
Author(s) -
Halas Stanislaw,
Szaran Janina
Publication year - 2001
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/rcm.416
Subject(s) - chemistry , thermal decomposition , decomposition , reproducibility , reagent , sulfate , radiochemistry , analytical chemistry (journal) , pyrolysis , mass spectrometry , nuclear chemistry , chromatography , organic chemistry
We describe a significant improvement to our low‐temperature thermal decomposition of sulfates to SO 2 for isotopic analysis (Halas S, Szaran J. Anal. Chem. 1999; 71: 3254) that has led to better reproducibility and efficiency of measurements. In the present approach we use a mixture of two reagents, NaPO 3 + V 2 O 5 , mixed in a weight ratio of 3:5. The addition of V 2 O 5 prevents overboiling of NaPO 3 at temperatures, T, increased to 800 °C. Using this modified method we obtained the following δ 34 S values (in ‰): +21.17 ± 0.12 for NBS‐127, +0.15 ± 0.06 for IAEA SO‐5, and −34.12 ± 0.11 for IAEA SO‐6. Copyright © 2001 John Wiley & Sons, Ltd.