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High-precision simultaneous O/ O, C/ C and O/ O analyses for µgquantities of CaCO by tunable infrared laser absorption spectroscopy 3
Saburo Sakai, Shinichi Matsuda, Toshihide Hikida, Akio Shimono, Barry J. McManus, Mark S. Zahniser, David D. Nelson, David Dettman, Danzhou Yang, and Naohiko Ohkouchi Anal. Chem., Just Accepted Manuscript • DOI: 10.1021/acs.analchem.7b03582 • Publication Date (Web): 22 Sep 2017 Downloaded from http://pubs.acs.org on October 13, 2017
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Analytical Chemistry
High-precision simultaneous 18O/16O, 13C/12C and 17O/16O analyses for µg-quantities of CaCO3 by tunable infrared laser absorption spectroscopy
Saburo Sakai*†¶⊥, Shinichi Matsuda‡, Toshihide Hikida§, Akio Shimono§, J. Barry McManus∥, Mark Zahniser∥, David Nelson∥, David L. Dettman⊥, Danzhou Yang¶ and Naohiko Ohkouchi† †
Institute of Biogeochemistry, Japan Agency for Marine-Earth Science and Technology, Yokosuka, Kaganaga 237-0061,
Japan ¶
Department of Medical Chemistry and Molecular Pharmacology, College of Pharmacy, Purdue University, West Lafayette,
Indiana 47907, United States ⊥Department
‡
of Geosciences, University of Arizona., Tucson Arizona 85721, United States
Izumo Web., Ltd., Izumo Shimane 693-0002, Japan
§
Shoreline Science Research Inc., Hachioji, Tokyo 192-0045, Japan
∥Center
of Atmospheric and Environmental Chemistry, Aerodyne Research, Inc., Billerica, Massachusetts 01821, United
States *E-mail:
[email protected], Phone: +81 46 867 9660
ABSTRACT: Stable isotope ratios (18O/16O,
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C/12C and
17
O/16O) in carbonates have
contributed greatly to understanding of Earth and planetary systems, climates, and history. Current methods for measuring isotopologues of CO2 derived from CaCO3 are
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Analytical Chemistry
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primarily gas-source isotope ratio mass spectroscopy (IRMS). However, IRMS has drawbacks, such as mass overlap by multiple CO2 isotopologues and contaminants, the requirement of careful sample purification, and use of major instrumentation needing permanent installation and a high power electrical supply. Here we report simultaneous 18O/16O, 13C/12C and 17O/16O analyses for µg-quantities of CaCO3 using a tunable mid-infrared laser absorption spectroscopy (TILDAS) system, which has no mass overlap problem, and yields high sensitivity/precision measurements on small samples, as small as 0.02 micromoles CO2 (equivalent to 2 µg of CaCO3) with standard errors of less than 0.08 ‰ for
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O/16O and
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C/12C (±0.136 ‰ and ±0.387 ‰
repeatability; n=10). In larger samples of CO2, 0.68 micromoles (or 68 µg of CaCO3), standard error is less than 0.04 ‰ for n=10), and 0.03 ‰ for
18
O/16O and
13
C/12C (
