Inter‐laboratory Characterisation of Apatite Reference Materials for Oxygen Isotope Analysis and Associated Methodological Considerations
Details
Serval ID
serval:BIB_44F14FD3F864
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Inter‐laboratory Characterisation of Apatite Reference Materials for Oxygen Isotope Analysis and Associated Methodological Considerations
Journal
Geostandards and Geoanalytical Research
ISSN
1639-4488
1751-908X
1751-908X
Publication state
Published
Issued date
06/2022
Peer-reviewed
Oui
Volume
46
Number
2
Pages
277-306
Language
english
Abstract
Here we report on the oxygen isotope compositions of four proposed apatite reference materials (chlorapatite MGMH#133648 and fluorapatite specimens MGMH#128441A, MZ-TH and ES-MM). The samples were initially screened for 18O/16O homogeneity using secondary ion mass spectrometry (SIMS) followed by δ18O determinations in six gas source isotope ratio mass spectrometry laboratories (GS-IRMS) using a variety of analytical protocols for determining either phosphate-bonded or “bulk” oxygen compositions. We also report preliminary δ17O and Δ’17O data, major and trace element compositions collected using EPMA, as well as CO32− and OH− contents in the apatite structure assessed using thermogravimetric analysis and infrared spectroscopy. The repeatability of our SIMS measurements was better than ± 0.25 ‰ (1s) for all four materials that cover a wide range of 103δ18O values between +5.8 and +21.7. The GS-IRMS results show, however, a significant offset of 103δ18O values between the “phosphate” and “bulk” analyses that could not be correlated with chemical characteristics of the studied samples. Therefore, we provide two sets of working values specific to these two classes of analytical methodologies as well as current working values for SIMS data calibration.
Keywords
secondary ion mass spectrometry, TC/EA, laser fluorination, thermogravimetry, infrared spectroscopy
Web of science
Create date
31/08/2022 22:55
Last modification date
10/01/2023 7:50