Interlaboratory Proficiency Test 11/2019

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Title: Interlaboratory Proficiency Test 11/2019
Author: Leivuori, Mirja; Koivikko, Riitta; Sara-Aho, Timo; Näykki, Teemu; Tervonen, Keijo; Lanteri, Sari; Väisänen, Ritva; Ilmakunnas, Markku
Publisher: Suomen Ympäristökeskus
Date: 2020
Belongs to series: Suomen ympäristökeskuksen raportteja 10/2020
ISBN: 978-952-11-5146-0
URI: http://hdl.handle.net/10138/313601
Abstract: Proftest SYKE carried out the proficiency test (PT) for analysis of elements in waste waters in October-November 2019 (MET 11/19). The measurands for the synthetic and waste water samples were: Al, As, B, Ba, Ca, Cd, Co, Cr, Cu, Fe, Hg, K, Mg, Mn, Mo, Ni, Pb, Sb, Se, Sn, Sr, Ti, V, and Zn. In total 23 laboratories participated in the PT. In total, 89 % of the results evaluated with z scores were satisfactory when total deviation of 10–25 % from the assigned value was accepted. Of the results evaluated with En scores, 91 % were satisfactory. Basically, either the metrologically traceable concentration, the calculated concentration, the robust mean, the mean or the median of the results reported by the participants was used as the assigned value for measurands. Warm thanks to all the participants in this proficiency test


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