Quality control of arsenic determination in drinking water with ICP-MS: Krakow Tap Survey 2010

摘要

In Poland in 2010 screening tap survey is performed in selected cities as a part of European research project "Metals and related substances in drinking water in Poland" (Project No. 28.28.140.7013). Also in Krakow drinking water samples from taps were collected and analyzed using ICP-MS. Some possible sources of uncertainty in the arsenic determination were examined. The first one was impact of nitric acid used to sampling preservation. The results show that nitric acid is not significant source of uncertainty. Also using bottles gives not important part of uncertainty. The analysis of control samples was also performed. The mean value of arsenic concentration in laboratory blank samples was 0.242 μg/L, in field blank samples 0.371 μg/L, whereas parametric value for this element according to Drinking Water Directive [1] is 10 μg/L. Total relative expanded uncertainty for arsenic in drinking water in Cracow is bigger than 50% (it should be considered when we compare the results to the parametric value), but measurement relative uncertainty equals only 6.43%.