Stable carbon and oxygen isotopic determination of sub‐microgram quantities of CaCO3 to analyze individual foraminiferal shells
- 1 November 2004
- journal article
- research article
- Published by Wiley in Rapid Communications in Mass Spectrometry
- Vol. 18 (23) , 2883-2888
- https://doi.org/10.1002/rcm.1701
Abstract
We have developed an analytical system to determine stable isotopic compositions (δ13C and δ18O) of sub-microgram quantities of CaCO3 for the purpose of analyzing individual foraminiferal shells, using continuous-flow isotope ratio mass spectrometry (CF-IRMS). The system consists of a micro-volume CaCO3 decomposition tube, stainless steel CO2 purification vacuum line with a quantity-regulating unit, helium-purged CO2 purification line, gas chromatograph, and a CF-IRMS system. By using this system, we can determine stable carbon and oxygen isotopic compositions as low as 0.2 μg of CaCO3, with standard deviations of ±0.10‰ for δ13C and ±0.18‰ for δ18O within a 4-h reaction time and 30-min analysis period. Copyright © 2004 John Wiley & Sons, Ltd.Keywords
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