Groundwater Development in North-Eastern Germany as deduced from the hydrogeochemical and stable isotopic composition of selected drinking waters

Anna-Kathrina Jenner1, M.E. Böttcher1, I. Schmiedinger1, M. Voss1, G. Böttcher2, B. Schwerdtfeger2
1 Sektion Marine Geologie, Institut für Ostseeforschung
2 LUNG Güstrow

P 16.2 in Trinkwasser und Wasserversorgung

The evolution of ground waters in Mecklenburg-Vorpommern (MV; North-Eastern Germany) one of the catchment areas for the Baltic Sea, is controlled by different natural and anthropogenic factors. In the present study the hydrochemical and stable isotope (H, C, N, O, S) composition of shallow and deep ground waters was investigated. A mass balance approach is combined with physico-chemical modeling to define the mineral dissolution/precipitation potential as well as the processes taking place during the ground water development. 

The dissolved inorganic carbon system of the ground waters is found to be controlled by the dissolution of biogenic carbon dioxide, the dissolution of (marine) carbonates and oxidation of anthropogenically introduced DOC and at a few sites biogenic methane. The sulfur isotope composition of dissolved sulfate indicates the substantial impact from the oxidation of sedimentary pyrite using oxygen or nitrate as electron acceptor at a number of settings. The nitrogen and oxygen isotope composition of dissolved nitrate indicate its origin as well as further microbial superimposition. The combined results are the base for a quantitative reaction path analysis.