山西长治辛安泉域岩溶水硫酸盐污染来源分析OA北大核心CSTPCD

The core area of Xin'an spring area is relatively developed in industry and agriculture,with strong human activities,gradually leading to water environment problems such as decreased karst groundwater level,reduced spring flow,and water pollution.Sulfate pollution is one of the main pollutants in karst water in spring areas.Analyzing and identifying pollution sources through scientific means can provide decision-making basis for spring protection.Sulfur and oxygen isotopes are widely used environmental isotope methods in the field of groundwater,with mature technology and high identification accuracy.This study combines sulfur and oxygen isotope methods with hydrochemical methods to test sulfur isotopes in five types of water samples:karst spring water,karst groundwater,pore water,fissure water,and river water in the Xin'an spring domain δ34S,oxygen isotopes δ18O and sulfate ion SO42-content to analyze the source of sulfate pollution in karst water of Xin'an spring area.The results show that most of the sulfate content in the karst water quality of Xin'an spring area meets the Class III groundwater standard.The areas with high sulfate content are mainly concentrated at the boundary between the western stagnant flow area and the Xiangyuan and Changzhi subsystems,as well as in the southern part of the Changzhi subsystem and the Pingshun Huguan subsystem.The sulfate in the western stagnant slow flow zone mainly comes from the dissolution of gypsum and anhydrite,and the impact of human activities is relatively small.The main source of sulfate in the karst water in the southern part of the spring region is the impact of coal mining,and atmospheric sedimentation is also an important source.