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Interlaboratory Proficiency Test 10/2018 - Metals in waste water and compost

Julkaisusarja ja numero:Reports of the Finnish Environment Institute 11/2019 
Tekijät:Leivuori, Mirja; Koivikko, Riitta; Sara-Aho, Timo; Näykki, Teemu; Pelkonen, Aija; Tervonen, Keijo; Lanteri, Sari; Väisänen, Ritva; Ilmakunnas, Markku 

75.00 €

Proftest SYKE carried out the proficiency test (PT) for analysis of elements in waters and compost material in October November 2018. The measurands for the synthetic and waste water samples were: Al, As, B, Ba, Ca, Cd, Co, Cr, Cu, Fe, Hg, Mg, Mn, Mo, Ni, Pb, Sb, Se, Sn, Sr, Stot, V, and Zn. For the compost sample the measurands were: As, Ca, Cd, Cr, Cu, Fe, Hg, K, Mg, Mn, Mo, Ntot, Ni, Ptot, Pb, Stot, V, and Zn. In total 21 laboratories participated in the PT. In total, 90 % of the results evaluated with z scores were satisfactory when total deviation of 10–25 % from the assigned value was accepted. From the results evaluated with En scores, 72 % were satisfactory. Basically, either the metrologically traceable concentration, 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.