Brewer, P J; Brown, R J C; Miller, M N; Minarro, M D; Murugan, A; Milton, M J T; Rhoderick, G C* (2014) Preparation and validation of fully-synthetic standard gas mixtures with atmospheric isotopic composition for global CO2 and CH4 monitoring. Anal. Chem., 86 (3). pp. 1887-1893.

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Abstract

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 in the ambient atmosphere. The mixtures are accurately representative of the ambient atmosphere and were prepared gravimetrically. The isotopic distribution of the carbon dioxide 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. This work demonstrates the feasibility of providing reference materials with SI traceability for these key components from multiple sources.

Item Type:	Article
Subjects:	Analytical Science Analytical Science > Gas Standards
Identification number/DOI:	10.1021/ac403982m
Last Modified:	02 Feb 2018 13:13
URI:	https://eprintspublications.npl.co.uk/id/eprint/6125