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Step Change in Improving the Accuracy of Nitrous Oxide Reference Materials for Underpinning Atmospheric Composition Measurements

Charoenpornpukdee, Kanokrat ; O’Doherty, Simon ; Webber, Eric Mussell ; Hill-Pearce, Ruth ; Hillier, Aimee ; Worton, David R. ; Arnold, Tim LU orcid ; Rennick, Chris ; Safi, Emmal and Brewer, Paul (2023) In Analytical Chemistry 95(34). p.12867-12874
Abstract

We have employed a new approach to quantify the amount fraction of nitrous oxide in a synthetic air matrix gas used to prepare high-accuracy reference materials of the same component. Until now, this was the largest contributor to the measurement uncertainty of nitrous oxide in air reference materials at atmospheric amount fractions (∼330 nmol mol-1), as identified in a recent international comparison. A novel preconcentration method has resulted in a measurement of 363 pmol mol-1 of nitrous oxide in a synthetic air matrix gas with an expanded uncertainty of 27 pmol mol-1. This represents a significant breakthrough as using these developments with an optimized dilution hierarchy (to minimize the... (More)

We have employed a new approach to quantify the amount fraction of nitrous oxide in a synthetic air matrix gas used to prepare high-accuracy reference materials of the same component. Until now, this was the largest contributor to the measurement uncertainty of nitrous oxide in air reference materials at atmospheric amount fractions (∼330 nmol mol-1), as identified in a recent international comparison. A novel preconcentration method has resulted in a measurement of 363 pmol mol-1 of nitrous oxide in a synthetic air matrix gas with an expanded uncertainty of 27 pmol mol-1. This represents a significant breakthrough as using these developments with an optimized dilution hierarchy (to minimize the gravimetric uncertainty) promises to result in SI traceable reference materials with expanded uncertainties as low as 0.032% relative (k = 2). This supports the World Meteorological Organization-Global Atmosphere Watch network compatibility goal for underpinning atmospheric observations.

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author
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publishing date
type
Contribution to journal
publication status
published
in
Analytical Chemistry
volume
95
issue
34
pages
8 pages
publisher
The American Chemical Society (ACS)
external identifiers
  • scopus:85169066557
  • pmid:37581365
ISSN
0003-2700
DOI
10.1021/acs.analchem.3c02160
language
English
LU publication?
no
additional info
Publisher Copyright: © 2023 American Chemical Society.
id
013d21cc-c676-430d-9d78-dda338b82dab
date added to LUP
2024-10-22 10:15:23
date last changed
2025-07-16 09:21:19
@article{013d21cc-c676-430d-9d78-dda338b82dab,
  abstract     = {{<p>We have employed a new approach to quantify the amount fraction of nitrous oxide in a synthetic air matrix gas used to prepare high-accuracy reference materials of the same component. Until now, this was the largest contributor to the measurement uncertainty of nitrous oxide in air reference materials at atmospheric amount fractions (∼330 nmol mol<sup>-1</sup>), as identified in a recent international comparison. A novel preconcentration method has resulted in a measurement of 363 pmol mol<sup>-1</sup> of nitrous oxide in a synthetic air matrix gas with an expanded uncertainty of 27 pmol mol<sup>-1</sup>. This represents a significant breakthrough as using these developments with an optimized dilution hierarchy (to minimize the gravimetric uncertainty) promises to result in SI traceable reference materials with expanded uncertainties as low as 0.032% relative (k = 2). This supports the World Meteorological Organization-Global Atmosphere Watch network compatibility goal for underpinning atmospheric observations.</p>}},
  author       = {{Charoenpornpukdee, Kanokrat and O’Doherty, Simon and Webber, Eric Mussell and Hill-Pearce, Ruth and Hillier, Aimee and Worton, David R. and Arnold, Tim and Rennick, Chris and Safi, Emmal and Brewer, Paul}},
  issn         = {{0003-2700}},
  language     = {{eng}},
  month        = {{08}},
  number       = {{34}},
  pages        = {{12867--12874}},
  publisher    = {{The American Chemical Society (ACS)}},
  series       = {{Analytical Chemistry}},
  title        = {{Step Change in Improving the Accuracy of Nitrous Oxide Reference Materials for Underpinning Atmospheric Composition Measurements}},
  url          = {{http://dx.doi.org/10.1021/acs.analchem.3c02160}},
  doi          = {{10.1021/acs.analchem.3c02160}},
  volume       = {{95}},
  year         = {{2023}},
}