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The pH, δ13C of total dissolved carbon and HCO3−, Ca2+, Ca2+ + Mg2+ contents in spring waters were investigated. Changes of these values were recorded for 8 months of 1982 and 1983. The changes were irregular and larger in winter and early spring, than in autumn and late spring. These changes and a longterm trend observed in October and November are discussed in terms of models of Deines et al. (1974) and the theory of mixing of waters (Wigley and Plummer 1976).

Chemistry and δ13C of Total Dissolved Carbon in Waters of Selected Springs nearby Lublin City