Chemistry of groundwater from sandstone aquifer in Wolonghu coal mine, northern Anhui Province, China

Water disaster during coal mining in northern Anhui Province, China is serious at the moment and geochemical method is important for controlling of water disaster. In this paper, the major ion chemistry of groundwater from a sandstone aquifer in Walonghu. coal Mine have been measured for evaluating the factors controlling the groundwater chemistry, the results indicate that these water are alkaline in nature and show highly mineralization and then can be classified as two types in recharge and discharge zone with different chemical signatures, respectively. They are oversaturated with calcite and dolomite but under-saturated with gypsum. The correlation between ion concentrations suggest that the chemical compositions of groundwater are controlled by multi factors including dissolution of calcite, dolomite and silicate minerals, evaporation and ion exchange.