Multi-isotope coupling models for revealing sulfate source and migration associated with lacustrine groundwater discharge in a large mining area on the Loess Plateau - Zhengguang Zhang; Shen Qu; Xiangyang Liang; Zilong Liao; Yuanzhen Zhao; Keyi Zhang; Chenyu Wang; Fei Gao; Quandong Lian; Ruihong Yu (Process Safety and Environmental Protection, 2026)