The GeoPT Proficiency Testing Scheme for Laboratories Routinely Analysing Silicate Rocks: A Review of the Operating Protocol and Proposals for its Modification |
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| Authors: | Michael Thompson Peter C Webb Philip J Potts |
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| Institution: | 1. School of Biological and Chemical Sciences, Birkbeck University of London, London, UK;2. Faculty of Science, The Open University, Milton Keynes, UK |
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| Abstract: | The GeoPT proficiency testing programme for geochemical laboratories has been operating for nearly 20 years. This review, based on an analysis of accumulated data and extensive experience, examines whether the protocol followed during this period continues to be appropriate. Possible changes that might be considered for future implementation are examined, in particular the procedures for calculating assigned values, target values, z‐scores and the applicability of dual fitness‐for‐purpose criteria. We conclude that the existing protocol remains largely appropriate and effective, but propose that a single fitness‐for‐purpose criterion be adopted, with an option for laboratories to recalculate their z‐scores if the criterion is inappropriate for their requirements. |
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| Keywords: | proficiency testing GeoPT laboratory performance quality assurance review z‐scores silicate rock analysis essais d'aptitude Gé oPT performance des laboratoires assurance qualité revue scores‐z analyse de roche silicaté e |
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