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1 Geological Quarterly

1 2008

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Hydrogeochemistry and vulnerability of ground water in the moraine upland aquifers of the Gdańsk region (Northern Poland)

Pruszkowska M., Malina G.

Geological Quarterly

2008

Vol. 52, No 3

291-291

The focus of this study was on determination and comparison of natural and current hydrogeochemical features of the groundwater, in order to evaluate changes of water quality and to identify the origin of these changes. Both natural processes and anthropogenic stress affect the chemical composition of groundwater were recognised. In both aquifer groups groundwater chemical composition dem on strates some similarities and is formed by the same kinds of natural processes, which are taking place already in the upper zones of the shallow aquifers, where groundwater is saturated with respect to most of carbon ate and clay minerals, as well as minerals containing Fe exp. 2+ ions. During seepage into deeper aquifers, water is being enriched with Fe exp. 2+ and Mn exp. 2+ ions and in some places with SO4exp.2 - and Mg exp.2+ as well. The types and intensity of human activities, as well as the vulnera ility of aquifers to contamination, were concluded to play an important role in generating the observed changes in the chemical character is tics of the groundwater. They effect on changes of hydrogeochemical back ground values (e.g. TDS, N-com pounds), the current in crease of maximum concentrations of N-com pounds, chlorides, sulphates, magnesium and TDS (total dissolved solids).