Hydrogeochemistry Characteristics of Groundwater in the Nandong Karst Water System, China

The hydrogeochemical characteristics of groundwater are an important element in the study spatial and temporal variation resources, which is crucial to water resources utilization, ecological environmental protection, human development. Water samples were collected at eight observation Nandong Karst System (NKWS) sites each month 2019, main ions isotopes examined. hydrogeochemistry its differences with surface explored by using methods multivariate statistics, Gibbs model. Results showed that chemistry types mainly HCO3–Ca HCO3–Ca·Mg. analysis hydrogen oxygen isotope initial recharge source atmospheric precipitation, measured heavier due strong evaporation effect. natural anthropogenic processes contributed chemical composition area. However, factor affecting quality was input contaminants. In terms factors, controlled water-rock action originating from weathering hydrolysis rocks soils. Ca2+, Mg2+, HCO3− originated dissolution carbonate rocks. K+, Na+, SO42−, Cl− partly precipitation. For activities, Na+ domestic for local residents. SO42− came mining. NO3− fertilizers, waste sewage.