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Interlaboratory Proficiency Test 06/2016 - Metals in water and sediment

Julkaisusarja ja numero:Reports of the Finnish Environment Institute 31/ 2016 
Kustantaja:Suomen ympäristökeskus 
Saatavuus (pdf):http://hdl.handle.net/10138/166057 
Tekijät:Mirja Leivuori, Riitta Koivikko, Timo Sara-Aho, Teemu Näykki, Keijo Tervonen, Sari Lanteri, Ritva Väisänen and Markku Ilmakunnas 

60.00 €

Proftest SYKE carried out the proficiency test (PT) for analysis of elements in waters and sediment in May 2016. The measurands were: The measurands were: Al, As, Cd, Co, Cr, Cu, Fe, Hg, Mn, Ni, Pb, Se, V, and Zn, for sediment sample also Drw, N, P, S and TC. Four sample types were: synthetic, domestic and natural water as well as sediment sample. In total 24 participants joined in the PT. In this proficiency test 90 % of the results were satisfactory when deviation of 5 – 25 % from the assigned value was accepted. Basically, either the metrologically traceable concentration, calculated concentration, the robust mean, or mean of the results reported by the participant was used as the assigned value for measurands. The evaluation of the performance of the participants was carried out using z score. In some cases the evaluation of the performance was not possible e.g. due to the low number of the participants or the high deviation of reported results. There, when possible, D% scores were calculated. Warm thanks to all the participants of this proficiency test!