Integrating spatial heterogeneity and speciation dynamics in source apportionment of toxic metal(loid)s at an abandoned hydrometallurgical zinc smelting site - Hengbo Liu; Xu Cao; Zhiyue Gao; Yi Wu; Yongfang Sa; Qinying Yao; Jianzhou Han; Jinyan Yang; Jiang Hou; Tao Xing (Environmental Geochemistry and Health, 2025)