Shallow Groundwater Quality and Its Controlling Factors in the Su-Xi-Chang Region, Eastern China.

In the study area, the dominant source of Ca 2+ provided by gypsum and anhydrite dissolution and that of Na + provided by the dissolution of the Na 2 SO 4 minerals mirabilite and the nardite can be deduced from the highly significant correlations between Ca 2+ versus SO 4 2− and Na + versus SO 4 2− ( Table 3 ).

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