文献类型：期刊文献

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

作者：Chengxin Jiang Caixiang Zhang Fenfei Gao Mingang Zhu

第一作者：Chengxin Jiang;江成鑫

机构：[1]School of Environmental Studies,China University of Geosciences(Wuhan),Wuhan 430078,China;[2]College of Resources and Environmental Engineering,Guizhou Institute of Technology,Guiyang 550025,China;[3]State Key Laboratory of Geomicrobiology and Environmental Changes,China University of Geosciences(Wuhan),Wuhan 430078,China;[4]Guizhou Water&Power Survey-Design Institute Co.,Ltd.,Guiyang 550002,China;[5]Power China Urban Planning&Design Institute Co.,Ltd.,Guangzhou 511458,China

第一机构：School of Environmental Studies,China University of Geosciences(Wuhan),Wuhan 430078,China

年份：2026

卷号：37

期号：1

起止页码：229-240

中文期刊名：Journal of Earth Science

外文期刊名：地球科学学刊(英文版)

基金：financially supported by the National Natural Science Foundation of China(No.42077184);Guizhou Institute of Technology's Research Initiation Fund Project for High-Level Talents(No.XJGC20190602)。

语种：英文

中文关键词：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 Mn^(2+)and NH_(3)-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.