Interlaboratory Proficiency Test 04/2017 – Metals in natural waters

Abstract

Proftest SYKE carried out the proficiency test (PT) for analysis of elements in natural and domestic waters in April-May 2017. The measurands were: Al, As, B, Ba, Cd, Co, Cr, Cu, Fe, Hg, Mn, Mo, Ni, Pb, Sb, Se, Sn, Sr, Stot, Ti, U, V, and Zn. Three sample types were: synthetic, domestic and natural (river) water. In total 20 participants joined in the PT. In this proficiency test 92 % of the results were satisfactory when deviation of 10–25 % from the assigned value was accepted. Basically, either the metrologically traceable concentration, the calculated concentration, the robust mean, or the mean 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 of this proficiency test!