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Accurate Measurements of H 2 O, F and Cl Contents in Biotite Using Secondary Ion Mass Spectrometry
Author(s) -
Siron Guillaume,
Baumgartner Lukas P.,
Bouvier AnneSophie,
Vennemann Torsten
Publication year - 2018
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.12235
Subject(s) - biotite , analytical chemistry (journal) , homogeneity (statistics) , content (measure theory) , chemistry , isotope , mass spectrometry , ion , secondary ion mass spectrometry , mineralogy , materials science , physics , quartz , mathematics , chromatography , nuclear physics , mathematical analysis , statistics , organic chemistry , composite material
Five biotite reference materials (RMs) currently used for oxygen isotope measurements at the SwissSIMS laboratory (University of Lausanne) were investigated for their H 2 O, F and Cl contents using secondary ion mass spectrometry in negative mode. The homogeneity of these RMs, as well as that of the international reference material NBS30, was tested by exploiting the high sensitivity of the SIMS technique. No crystal orientation dependency was discovered at the level of the homogeneity of the RMs. Normalisation schemes with 28 Si − , 30 Si − 16 O − and 18 O − were explored. A matrix effect is documented here for H 2 O measurements, which depended on SiO 2 and X Mg compositions of the different biotite RMs. A successful multivariate fit was obtained that reproduces the H 2 O content of the six biotite RMs, this within error of 0.15% m / m and with a reduced χ 2 (or MSWD) of 0.672. Fluorine and Cl contents were calibrated using a linear fit for F content between 0% and 4% m / m and Cl content below 0.3% m / m . Accuracy for H 2 O measurements is expected to be 3–4% (1SE). Accuracy for F content was about 3% (1 s ) and typically about 15% (1 s ) for Cl content.