129314 - Use of laser spectroscopy to measure the 13C and 18O compositions of carbonate minerals.pdf (543.96 kB)
Use of laser spectroscopy to measure the 13C/12C and 18O/16O compositions of carbonate minerals
journal contribution
posted on 2023-05-19, 22:42 authored by Shaun BarkerShaun Barker, Dipple, GM, Dong, F, Baer, DSThe stable carbon and oxygen isotope compositions of carbonate minerals are utilized throughout the earth and environmental sciences for various purposes. Here, we demonstrate the first application of a prototype instrument, based on off-axis integrated cavity output laser spectroscopy, to measure the carbon and oxygen isotope composition of CO2 gas evolved from the acidification of carbonate minerals. The carbon and oxygen isotope ratios were recorded from absorption spectra of 12C16O16O, 13C16O16O, and 12C16O18O in the near-infrared wavelength region. The instrument was calibrated using CaCO3 minerals with known δ13CVPDB and δ18OVSMOW values, which had been previously calibrated by isotope ratio mass spectrometry relative to the international isotopic standards NBS 18 and NBS 19. Individual analyses are demonstrated to have internal precision (1 SE) of better than 0.15‰ for δ13C and 0.6‰ for δ18O. Analysis of four carbonate standards of known isotopic composition over 2 months, determined using the original instrumental calibration, indicates that analyses are accurate to better than 0.5‰ for both δ13C and δ18O without application of standard−sample−standard corrections.
History
Publication title
Analytical ChemistryVolume
83Issue
6Pagination
2220-2226ISSN
0974-7419Department/School
School of Natural SciencesPublisher
ACS PublicationsPlace of publication
IndiaRights statement
copyright 2011 American Chemical SocietyRepository Status
- Open