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Abstract The use of proficiency testing schemes (PTS) by laboratories as an integral part of their quality
system has been increasing in recent years. Accreditation bodies, regulators and the laboratories customers
are increasingly using results from PTS in their relationship with laboratories. There are many PTS available in
Europe in analytical chemistry; EPTIS indicates over 400. The comparability of these PTS is now a real issue,
as many organisers of PTS move into new markets. The COEPT project has systematically demonstrated (in four
technical sectors water, soil, food and occupational hygiene), that there are many similarities between PTS in
each sector. For example, nearly all use the z-score as a performance index. One significant difference between
many PTS is the value used for the term s in the z-score equation, and this gives a range of evaluations for the
same data point. Despite this, the agreement between PTS in the same sector for the evaluation of data is
approximately 85%. COEPT has given us a basis for establishing the comparability of PTS and showing us where
further harmonisation could occur.
Refinery gas is a complex mixture of hydrocarbons and non-combustible gases (e.g., carbon monoxide, carbon dioxide, nitrogen, helium). It is obtained as part of the refining and conversion of crude oil. This key comparison aims to evaluate the measurement capabilities for these types of mixtures. The results of the key comparison indicate that the analysis of a refinery-type gas mixture is for some laboratories a challenge. Overall, four laboratories (VSL, NIM, NPL and VNIIM) have satisfactory results. The results of some participants highlight some non-trivial issues, such as appropriate separation between saturated and unsaturated hydrocarbons, and issues with the measurement of nitrogen, hydrogen and helium.
Main text. To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/.
The final report has been peer-reviewed and approved for publication by the CCQM, according to the provisions of the CIPM Mutual Recognition Arrangement (MRA).
DatesIssue 1A (Technical Supplement 2012)