Interlaboratory Proficiency Test 02/2019 - Chlorophyll a, colour, conductivity, nutrients, pH and turbidity in natural waters

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Title: Interlaboratory Proficiency Test 02/2019 - Chlorophyll a, colour, conductivity, nutrients, pH and turbidity in natural waters
Author: Koivikko, Riitta; Leivuori, Mirja; Sarkkinen, Mika; Tervonen, Keijo; Lanteri, Sari; Väisänen, Ritva; Ilmakunnas, Markku
Publisher: Finnish Environment Institute
Date: 2019
Belongs to series: Reports of the Finnish Environment Institute 23/2019
ISBN: 978-952-11-5038-8
ISSN: 1796-1726
URI: http://hdl.handle.net/10138/302233
Abstract: Proftest SYKE carried out the proficiency test for the determination of chlorophyll a, colour, conductivity, nutrients, pH, and turbidity in natural waters in February 2019. In total, there were 34 participants in the proficiency test. Either the calculated concentration, the robust mean or the median of the results reported by the participants 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 85 % 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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