|ISBN (pdf):||978-952-11-4526-1|| |
|Julkaisusarja ja numero:||Reports of the Finnish Environment Institute 32/2015|| |
|Kustantaja:||Finnish Environment Institute|| |
|Saatavuus (pdf):||http://hdl.handle.net/10138/156303|| |
|Tekijät:||Mirja Leivuori; Riitta Koivikko; Timo Sara-Aho; Teemu Näykki; Keijo Tervonen; Sari Lanteri; Ritva Väisänen; Markku Ilmakunnas
Proftest SYKE carried out the proficiency test (PT) for analysis of elements in natural waters and arable soil in April 2015. The measurements were: Al, As, Ba, Cd, Co, Cr, Cu, Fe, Hg, Mn, Ni, Pb, Se, Sr, Ti, U, V, and Zn. Four sample types were: synthetic, river and ground water and arable soil samples. In total 27 laboratories participated in the PT. In this proficiency test 89 % of the results were satisfactory when deviations of 10 - 35 % 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.