GeoPT4. An International Proficiency Test for Analytical Geochemistry Laboratories - Report on Round 4 (March 1999) |
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| Authors: | Michael Thompson Philip J Potts Jean S Kane Peter C Webb John S Watson |
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| Institution: | Department of Chemistry, Birkbeck College, Gordon House, London, WC1H 0PP, UK;Department of Earth Sciences, The Open University, Walton Hall, Milton Keynes, MK7 6AA, UK;Robert J. Kane Associates Inc., HCR 4, Box 231, Brightwood, VA 22715, USA |
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| Abstract: | Results are presented from the seventy five laboratories participating in GeoPT4, round four of the international proficiency testing programme for analytical geochemistry laboratories. Laboratories were required to analyse the sample OU-2 (Belford dolerite) using routine methods of analysis. The sample was distributed during September 1998 with a deadline for the submission of results of 15th January 1999. In this report, contributed data are analysed and z-scores calculated. Z-score values provide participating laboratories with information concerning the quality of their results and indicate data that may be subject to unsuspected analytical bias. Laboratories are invited to examine these data and take the appropriate action. |
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| Keywords: | proficiency testing GeoPT round 4 OU-2 quality assurance |
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