Identification of groundwater nitrate pollution sources in agricultural area using PCA and SIAR methods

1 College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China 2 Key Laboratory of Marine Environment and Ecological Education, Ocean University of China, Qingdao 266100, China 3 College of Engineering, Ocean University of China, Qingdao 266100, China; *Corresponding author, E-mail: zhengtianyuan@ouc.edu.cn 4 Center for Eco-Environmental Research, Nanjing Hydraulic Research Institute, Nanjing 210098, China

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