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Preparation and Validation of Fully Synthetic Standard Gas Mixtures with Atmospheric Isotopic Composition for Global CO_2 and CH_4 Monitoring

机译:用于全球CO_2和CH_4监测的具有大气同位素组成的全合成标准气体混合物的制备和验证

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We report the preparation and validation of the first fully synthetic gaseous reference standards of CO_2 and CH_4 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 CO_2 was matched to the abundance in the ambient atmosphere by blending ~(12)C-enriched CO_2 with ~(13)C-enriched CO_2 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.
机译:我们报告了在大气分布中具有同位素分布匹配的整个空气基质中,CO_2和CH_4的第一个全合成气态参考标准品的制备和验证。混合物准确地代表了周围的大气,并用重量分析法制备。通过将〜(12)C富集的CO_2与〜(13)C富集的CO_2混合,可将CO_2的同位素分布与周围大气中的丰度匹配,以避免仅由某些同位素检测到的测量仪器引入的测量偏差。此处制定的参考标准已与美国国家标准技术研究所制定的标准以及WMO等级的标准进行了比较。它们表现出出色的可比性。

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