Interlaboratory Proficiency Test 05/2020. Metals in natural waters

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Title: Interlaboratory Proficiency Test 05/2020. Metals in natural waters
Author: Leivuori, Mirja; Koivikko, Riitta; Sara-Aho, Timo; Näykki, Teemu; Tervonen, Keijo; Lanteri, Sari; Väisänen, Ritva
Publisher: Finnish Environment Institute
Date: 2020
Belongs to series: Reports of the Finnish Environment Institute 37/2020
ISBN: 978-952-11-5207-8
ISSN: 1796-1726
Abstract: Proftest SYKE carried out the proficiency test (PT) for analysis of elements in natural waters in April–May 2020. The measurands for the synthetic, ground water and lake water samples were: Al, As, B, Ba, Cd, Co, Cr, Cu, Fe, Hg, Mn, Mo, Ni, Pb, Sb, Se, Sr, Ti, U, V, and Zn. In total 16 participants joined in the PT. In this proficiency test 88 % of the results were satisfactory when deviation of 10–30 % from the assigned value was accepted. Basically, either the metrologically traceable concentration, the calculated concentration or the robust mean, the mean or the median of the results reported by the participants was used as the assigned value for the measurands. The evaluation of the performance of the participants was carried out using z scores. Warm thanks to all the participants in this proficiency test!

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