Preparation and Validation of Fully Synthetic Standard Gas Mixtures with Atmospheric Isotopic Composition for Global CO2 and CH4 Monitoring

详细信息    查看全文

• 作者：Paul J. Brewer ; Richard J. C. Brown ; Michael N. Miller ; Marta Doval Mi帽arro ; Arul Murugan ; Martin J. T. Milton ; George C. Rhoderick
• 刊名：Analytical Chemistry
• 出版年：2014
• 出版时间：February 4, 2014
• 年：2014
• 卷：86
• 期：3
• 页码：1887-1893
• 全文大小：294K
• ISSN：1520-6882

文摘

We report the preparation and validation of the first fully synthetic gaseous reference standards of CO₂ and CH₄ in a whole air matrix with an isotopic distribution matching that is in the ambient atmosphere. The mixtures are accurately representative of the ambient atmosphere and were prepared gravimetrically. The isotopic distribution of the CO₂ was matched to the abundance in the ambient atmosphere by blending ¹²C-enriched CO₂ with ¹³C-enriched CO₂ in order to avoid measurement biases introduced by measurement instrumentation detecting only certain isotopologues. The reference standards developed here have been compared with standards developed by the National Institute of Standards and Technology and standards from the WMO scale. They demonstrate excellent comparability.