文献类型：期刊文献

英文题名：Environmental Geochemistry of Electrolytic Manganese Slag Ponds in Karst Regions

作者：Jiang, Chengxin Zhang, Caixiang Gao, Fenfei Zhu, Mingang

第一作者：江成鑫;Jiang, Chengxin

通信作者：Zhang, CX[1];Zhang, CX[2]

机构：[1]China Univ Geosci Wuhan, Sch Environm Studies, Wuhan 430078, Peoples R China;[2]Guizhou Inst Technol, Coll Resources & Environm Engn, Guiyang 550025, Peoples R China;[3]China Univ Geosci Wuhan, State Key Lab Geomicrobiol & Environm Changes, Wuhan 430078, Peoples R China;[4]Guizhou Water & Power Survey Design Inst Co Ltd, Guiyang 550002, Peoples R China;[5]Power China Urban Planning & Design Inst Co Ltd, Guangzhou 511458, Peoples R China

第一机构：China Univ Geosci Wuhan, Sch Environm Studies, Wuhan 430078, Peoples R China

通信机构：corresponding author), China Univ Geosci Wuhan, Sch Environm Studies, Wuhan 430078, Peoples R China;corresponding author), China Univ Geosci Wuhan, State Key Lab Geomicrobiol & Environm Changes, Wuhan 430078, Peoples R China.

年份：2026

卷号：37

期号：1

起止页码：229-240

外文期刊名：JOURNAL OF EARTH SCIENCE

收录：;EI(收录号：20260820142422);WOS:【SCI-EXPANDED(收录号:WOS:001697046200006)】；

基金：This research was financially supported by the National Natural Science Foundation of China (No. 42077184), and Guizhou Institute of Technology's Research Initiation Fund Project for High-Level Talents (No. XJGC20190602). The final publication is available at Springer via https://doi.org/10.1007/s12583-026-0503-7.

语种：英文

外文关键词：manganese; transformation and migration; mineral facies; redox shift; slag pond leakage; groundwater pollution

摘要：Leakage of electrolytic manganese slag (EMS) ponds is a long-lasting and serious threat to environmental health worldwide, particularly in karst areas where the ecosystems are highly sensitive to geochemical perturbations. However, the mechanisms of Mn mobilization and migration are insufficiently known. In this study, we combine systematic field investigations, laboratory column experiments and geochemical analyses to clarify the environmental geochemistry and controlling factors of leaching of Mn in the karst areas of southwestern China. While the Mn slag ponds as a whole had shown a low permeability, release of free Mn2+ and NH3-N is significantly facilitated by the synergies of seepage infiltration, microbial activities and environmental acidification. With the increase of depth, the mineralogical composition of the slag undergoes significant alteration, and redox conditions change from acidic-oxidizing to acidic-reducing environments, which will accelerate the mobilization of Mn further and increase the risk of groundwater contamination. In addition, the presence of clay mineral colloids in Mn slag changes the migration properties of Mn, which introduces complexity in the geochemical behavior of Mn. Our findings highlight that Mn transformation and migration are controlled by dynamic, depth-dependent geochemical processes and the interplay of both internal and external factors. This research consolidates mechanistic foundation of deciphering Mn environmental behaviors in karst regions, reinforcing the urgency of preventing and rehabilitating electrolytic Mn slag leakage.