Interlaboratory Proficiency Test 08/2015. Metals in waste waters and sludge
2016
Koivikko, Riitta | Leivuori, Mirja | Sara-Aho, Timo | Näykki, Teemu | Tervonen, Keijo | Lanteri, Sari | Väisänen, Ritva | Ilmakunnas, Markku
Proftest SYKE carried out the proficiency test (PT) for analysis of elements in waste waters and sludge in October 2015. The measurements were: Al, As, B, Cd, Co, Cr, Cu, Fe, Hg, Mn, Mo, Ni, Pb, Sb, Se, V, and Zn. Additional measurands for sludge were: Sn, Ntot, Ptot, Stot, and dry weight. Four sample types were: synthetic, municipal and industrial effluents as well as sludge samples. In total 23 laboratories participated in the PT. In this proficiency test 90 % of the results were satisfactory when deviations of 5 - 30 % from the assigned values were accepted. Basically, the metrologically traceable concentration, calculated concentrations or the robust mean or mean of the results reported by the participant were used as the assigned values for measurements. 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.
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