1. School of Environmental Studies, China University of Geosciences, Wuhan 430078, China; 2. Key Laboratory of Groundwater Quality and Health, Ministry of Education, China University of Geosciences, Wuhan 430078, China; 3. Institute of Geological Survey, China University of Geosciences, Wuhan 430074, China; 4. State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430078, China; 5. The Fifth Geological Brigade of Shandong Geological and Mineral Exploration and Development Bureau, Tai'an 271000, China; 6. Hubei Key Laboratory of Resources and Eco-Environment Geology, Hubei Geological Bureau, Wuhan 430034, China
Abstract：This study investigated the susceptibility of karst groundwater from surface pollution. A typical karst spring system (the Chaoshuidong in Yichang, Hubei Province of China) was selected to analyze the contamination characteristics, sources, and transport processes of organochlorine pesticides (OCPs). Water, soil, and sediment samples were collected in four seasons for OCP analysis. The results showed that the average concentrations of OCPs in surface water, spring water, soil and sediment samples from Chaoshuidong system were 8.25ng/L, 5.11ng/L, 15.9ng/g and 12.6ng/g, respectively. OCPs concentrations in the Chaoshuidong system were relatively lower than in other regions, with seasonal fluctuations closely correlated to hydrogeological conditions and OCPs transport dynamics. Composition analysis of hexachlorocyclohexanes (HCHs) and dichlorodiphenyltrichloroethanes (DDTs) indicated that HCHs were primarily from agricultural inputs of Lindane(γ-HCH) in the water and sediments, while the technical HCH dominated in the soils. DDTs were mainly a mixture of inputs from technical DDT and dicofol pesticide in all three media. The contribution of OCPs from the soils in the recharge area to the upstream surface water and to the spring water was 87.8% and 58.3%, respectively, and the contribution of OCPs from the spring water in the discharge area to the spring sediments was 64.2%. This study demonstrated that OCPs can be rapidly transported from recharge area to discharge area through two primary pathways: surface transport and underground transport, subsequently contaminating water bodies.
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