Interlaboratory Proficiency Test 02/2020

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Title: Interlaboratory Proficiency Test 02/2020
Author: Koivikko, Riitta; Leivuori, Mirja; Sarkkinen, Mika; Tervonen, Keijo; Lanteri, Sari; Väisänen, Ritva; Ilmakunnas, Markku
Publisher: Finnish Environment Institute
Date: 2020
Belongs to series: Reports of the Finnish Environment Institute 18/2020
ISBN: 978-952-11-5166-8
ISSN: 1796-1726
Abstract: Proftest SYKE carried out proficiency test (PT) for analysis of alkalinity, conductivity, nutrients and pH in natural waters in February 2020. In total, there were 31 participants in the PT. Either the calculated concentration or the robust mean or the median of the reported results was used as the assigned value for the measurands. The overall performance of the participants was evaluated by using z scores. In this proficiency test 89 % of the results evaluated with z scores were satisfactory when total deviation of 0.2 pH units for pH values and 5–25 % for the other determinations was accepted from the assigned value. Warm thanks to all the participants in this proficiency test!

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