Intercomparison 1125: pH, Conductivity, Alkalinity, NO3-N, Cl, SO4, Ca, Mg, Na, K, TOC, Al, Fe, Mn, Cd, Pb, Cu, Ni, and Zn (ICP Waters report 107/2011)
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- NIVA-rapport 
67 laboratories received samples for the intercomparison 1125, and 57 laboratories in 25 countries submitted results. Two sample sets were used, one for the determination of major ions, and one for heavy metals. Based on the general target accuracy of 20 %, 83 % of the overall results were considered as acceptable. This is the best result ever. The best results were reported for the analytical variables sodium, cadmium, calcium and iron, with 95, 94, 91 and 91 % acceptable results, respectively. The lowest percentage were observed for lead, total organic carbon and nickel with 67, 69 and 72 % acceptable results. Harmonization of the analytical methods used, and the practical procedures followed, may probably be the most important way to improve the comparability for these parameters.
PublisherNorsk institutt for vannforskning
ICP Waters report;107/2011