Distribution of heavy metals in potable groundwater of Dnieper-Donetsk artesian basin northwestern slope (as an example of Kyiv groundwater deposit)

SUMMARY The research is devoted to investigation of potable groundwater of Dnieper-Donetsk artesian basin as an example of Kyiv groundwater deposit. The authors conducted the study aimed at identifying the features of the distribution of individual trace elements (heavy metals) in Cenomanian-Callovian groundwater complex and Bayos aquifer. During the research a set of analytical methods was used: atomic adsorption, absorption spectrophotometry, and mass spectrometry with inductively coupled plasma (ICP-MS). Statistical processing of chemical analysis of Kyiv well-rooms water by the content of individual trace elements indicated a slight exceedance of Maximum Allowable Concentration for lead. In addition, it was found that the average concentrations of heavy metals in groundwater of a deeper, Bayos aquifer are higher than the similar values of the above-lying Cenomanian-Callovian groundwater complex. The authors suggest that in this case, there is a complementary effect of natural and man-made factors. Meanwhile important role in this process can play intensification of highly mineralized pore solutions flow from weakly permeable layers to potable aquifers during depression funnel formation.