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Off‐Mount Calibration and One New Potential Pyrrhotite Reference Material for Sulfur Isotope Measurement by Secondary Ion Mass Spectrometry
Author(s) -
Li Rucao,
Xia Xiaoping,
Yang Shenghong,
Chen Huayong,
Yang Qing
Publication year - 2019
Publication title -
geostandards and geoanalytical research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.037
H-Index - 73
eISSN - 1751-908X
pISSN - 1639-4488
DOI - 10.1111/ggr.12244
Subject(s) - pyrrhotite , pyrite , sulfur , analytical chemistry (journal) , chemistry , secondary ion mass spectrometry , mass spectrometry , sulfide , isotope , mineralogy , geology , environmental chemistry , chromatography , physics , organic chemistry , quantum mechanics
Sulfur isotope measurements in three sulfide (two pyrite and one pyrrhotite) samples on two epoxy mounts showed that the mount‐to‐mount variation of raw δ 34 S values was negligible when secondary ion mass spectrometry ( SIMS ) analytical settings remained stable. In consequence, an off‐mount calibration procedure for SIMS sulfur isotope analysis was applied in this study. YP 136 is a pyrrhotite sample collected from northern Finland. Examination of thin sections with a polarising microscope, backscattered electron image analyses and wavelength dispersive spectrometry mapping showed that the sample grains display no internal growth or other zoning. A total of 318 sulfur isotope (spot) measurements conducted on more than 100 randomly selected grains yielded highly consistent sulfur isotope ratios. The repeatability of all the analytical results of 34 S/ 32 S was 0.3‰ (2 s , n = 318), which is the same as that of the well‐characterised pyrite reference materials PPP ‐1 and UWP y‐1. Its δ 34 S value determined by gas mass spectrometry was 1.5 ± 0.1‰ (2 s , n = 11), which agrees with the SIMS data (1.5 ± 0.3‰, 2 s ) calibrated by pyrrhotite reference material Po‐10. Therefore, YP 136 pyrrhotite is considered a candidate reference material for in situ sulfur isotope determination.