Interlaboratory Proficiency Test 03/2018 - Alkalinity, pH, nutrients and conductivity in natural waters

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Title: Interlaboratory Proficiency Test 03/2018 - Alkalinity, pH, nutrients and conductivity in natural waters
Author: Leivuori, Mirja; Koivikko, Riitta; Sarkkinen, Mika; Tervonen, Keijo; Lanteri, Sari; Väisänen, Ritva; Ilmakunnas, Markku
Publisher: Finnish Environment Institute
Date: 2018
Language: en
Belongs to series: Reports of the Finnish Environment Institute 11/2018
ISBN: 978-952-11-4928-3
ISSN: 1796-1726
URI: http://hdl.handle.net/10138/234399
Abstract: Proftest SYKE carried out the proficiency test for the determination of alkalinity, nutrients, pH and conductivity in natural waters in February 2018. In total, 30 participants joined in the proficiency test. The calculated concentration, the robust mean or the median of the results reported by the participants was chosen to be the assigned value for the measurands. The performance of the participants was evaluated by using z scores. In this proficiency test 85 % of the results were satisfactory when deviation of 0.2 pH units (for pH determination) and 5–20 % (for other determinations) from the assigned value was accepted. Warm thanks to all the participants of this proficiency test!


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