Intercomparison 0418: pH, Cond, HCO3 NO3+NO2, C1, SO4, Ca, Mg, Na, K, Fe, Mn, Cd, Pb, Cu, Ni, and Zn (ICP Waters report 78/2004)
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68 laboratories received samples for the intercomparison 0418, and 63 laboratories in 27 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 %, 77 % of the overall results were considered acceptable. The best results were reported for the analytical variables copper, sodium and sulphate, with a percentage of acceptable results of 95, 87 and 86 %, respectively. Lowest percentage of acceptable results were observed for alkalinity, pH and manganese, where only 52, 57 and 59 % of the result pairs, respectively, were acceptable. Harmonization of the analytical methods used is necessary to improve the comparability for pH.
PublisherNorsk institutt for vannforskning
ICP Waters report;78/2004