Optimized sample preparation for isotopic analyses of CO2 in air: systematic study of precision and accuracy dependence on driving variables during CO2 purification process
✍ Scribed by T. Bertolini; M. Rubino; C. Lubritto; A. D'Onofrio; F. Marzaioli; I. Passariello; F. Terrasi
- Publisher
- John Wiley and Sons
- Year
- 2005
- Tongue
- English
- Weight
- 120 KB
- Volume
- 40
- Category
- Article
- ISSN
- 1076-5174
- DOI
- 10.1002/jms.888
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✦ Synopsis
Abstract
A systematic analysis of efficiency, reproducibility and accuracy of cryogenic purification of CO~2~ 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 CO~2~‐trap shape. Experimental results demonstrate that efficiency, reproducibility and accuracy strongly depend on the CO~2~trap 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 δ^13^C and ≤0.05‰ for δ^18^O) and good accuracy (<0.09‰ for δ^13^C and <0.14‰ for δ^18^O) is achieved after applying the N~2~O correction. Copyright © 2005 John Wiley & Sons, Ltd.