Interlaboratory Proficiency Test 02/2021. Natural water analyses

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Title: Interlaboratory Proficiency Test 02/2021. Natural water analyses
Author: Grönroos, Päivi; Leivuori, Mirja; Koivikko, Riitta; Sarkkinen, Mika; Tervonen, Keijo; Lanteri, Sari; Väisänen, Ritva; Ilmakunnas, Markku
Publisher: Finnish Environment Institute
Date: 2021
Language: en
Belongs to series: Reports of the Finnish Environment Institute 31/2021
ISBN: 978-952-11-5413-3
ISSN: 1796-1726
Abstract: Proftest SYKE carried out the proficiency test (PT) for analysis of chlorophyll a, colour, conductivity, nutrients, pH and turbidity in natural waters in February-March 2021. In total, there were 34 participants in the PT. Either the calculated concentration or the robust mean, the mean or the median of the reported results was used as the assigned values for the measurands. The overall performance of the participants was evaluated by using z scores. In this PT 90 % of the results were satisfactory when total deviation of 0.2 pH units for pH values and 5–35 % for the other measurands was accepted from the assigned value. Warm thanks to all participants in this proficiency test!

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