Mutagenic activity of drinking water in Wroclaw, Poland.

The Salmonella mutagenicity test was applied to the evaluation of mutagenic activity of Wroclaw drinking water. Contaminants of water samples were concentrated by adsorption on XAD-2 resin. After while they were eluted sequentially with acetone, dichloromethane/methanol (1:1, v/v) and methanol, and then obtained organic extracts were evaporated to dryness. The extracts were then dissolved in DMSO and examined by using the Ames test. The results proved significant contamination of drinking water with mutagenic substances. Hydroxyapatite column chromatography performed after direct incubation of standard DNA probes with tested water extracts showed that drinking water was contaminated with DNA interstrand cross-linking substances. Filtration of tap water through carbon filters markedly reduced mutagenic activity of tested water extracts, whereas ceramic filters were more efficient in depleting of DNA interstrand cross-linking contaminants.