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Issue 23, 2015
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Assessing the stability of a proficiency test material by participant-blind re-use after a period of storage

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Abstract

A new, powerful and inexpensive test for the stability of reference materials characterised by the results of proficiency tests is demonstrated. Participant-blind re-issue of the same materials provides the scheme organiser with two independent estimates of the location and variance of the results. Because many participant laboratories are involved, the location estimates will not be confounded with changes in the execution of analytical procedures. The method is illustrated by its application to foodstuff test materials almost certain to be stable, with periods between the re-issues of between seven and 52 months. Apart from one discrepant result (out of 41), no statistically significant instability was demonstrated.

Graphical abstract: Assessing the stability of a proficiency test material by participant-blind re-use after a period of storage

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Article information


Submitted
26 Aug 2015
Accepted
22 Oct 2015
First published
26 Oct 2015

Anal. Methods, 2015,7, 9753-9755
Article type
Paper
Author version available

Assessing the stability of a proficiency test material by participant-blind re-use after a period of storage

M. Sykes and M. Thompson, Anal. Methods, 2015, 7, 9753
DOI: 10.1039/C5AY02255J

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