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Optimized sample preparation for isotopic analyses of CO2 in air: systematic study of precision and accuracy dependence on driving variables during CO2 purification process

Abstract

A systematic analysis of efficiency, reproducibility and accuracy of cryogenic purification of CO2 from air samples for isotopic analyses is presented. The technical characteristics of the cryogenic line are given in detail. To study the cryogenic process, three different operating parameters are considered: flow rate of the gas entering the line, pressure of the gas in the line, and CO2-trap shape. Experimental results demonstrate that efficiency, reproducibility and accuracy strongly depend on the CO2trap shape. Moreover, a dependence of reproducibility and accuracy on the flow rate of the gas is found, but not on its pressure. High precision (=0.02‰ for d13C and =0.05‰ for d18O) and good accuracy (<0.09‰ for d13C and <0.14‰ for d18O) is achieved after applying the N2O correction.

Acceptance Date Jul 22, 2005
Publication Date Jul 22, 2005
Journal Journal of Mass Spectrometry
Print ISSN 1076-5174
Publisher Wiley
Pages 1104 - 1108
DOI https://doi.org/10.1002/jms.888
Keywords stable isotopes, cryogenic purification of CO2, gas-isotope ratio mass spectrometry
Publisher URL https://doi.org/10.1002/jms.888

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