江西德兴铜矿附近流域土壤中重金属化学形态特征及意义  

Chemical speciation characteristics and significance of heavy metals in the soil of the river basin adjacent to the Dexing copper mining area,Jiangxi Province

作　　者：高知睿 常玉虎 赵元艺[3] GAO Zhi-rui;CHANG Yu-hu;ZHAO Yuan-yi(China Coal Geology Group Co.,Ltd.,Beijing 100040,China;Chinese Academy of Environmental Planning,Beijing 100041,China;MNR Key Laboratory of Saline Lake Resources and Environments,Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing 100037,China)

机构地区：[1]中煤地质集团有限公司,北京100040 [2]生态环境部环境规划院,北京100041 [3]中国地质科学院矿产资源研究所,自然资源部盐湖资源与环境重点实验室,北京100037

出　　处：《岩石矿物学杂志》2025年第1期167-180,共14页Acta Petrologica et Mineralogica

基　　金：国家科技重大专项(2024ZD1002005)。

摘　　要：采用Tessier修正的七步连续提取法对德兴铜矿区邻近的大坞河、浮溪河和乐安河(德兴段)流域沿岸土壤中重金属As、Cd、Cr、Cu、Hg和Pb不同化学形态特征进行分析,研究其含量特征、空间分布特征以及相关性特征,结果表明,研究区土壤中重金属不同元素的同种化学形态在平均含量分布上呈现出高度一致性,各元素化学形态组成特征总体上呈现出多元模式,Cd、Cu和Hg的化学形态组成在空间上表现出显著的差异性。As、Cd和Cu有效态最大百分含量在乐安河(德兴段)流域,Hg和Pb有效态最大百分含量分别在大坞河和浮溪河流域,Cr有效态含量在3个流域基本相同。土壤中不同重金属化学形态间的相关性以Cu、Hg和Pb较为显著,化学形态间的相互转化主要受到土壤环境中pH值、Eh值等因素的制约,同时影响着重金属的可迁移性和生物有效性。德兴地区的矿业活动是该区土壤重金属污染的主要原因,在该区污染土壤治理与修复的过程中应注意碳酸结合态和有机质结合态的释放与平衡。The chemical speciation characteristics of heavy metals(As,Cd,Cr,Cu,Hg,and Pb)in soils along the banks of the Dawu River,Fuxi River,and Le'an River(Dexing section),adjacent to the Dexing copper mining area,were systematically investigated using the modified seven-step sequential extraction procedure developed by Tessier.The study focused on the concentration profiles,spatial distribution patterns,and inter-element correlations of these metals.The findings demonstrated a high degree of uniformity in the average distribution of specific chemical species across different heavy metal elements within the study area.The chemical speciation profiles generally exhibited a multimodal distribution pattern,with Cd,Cu,and Hg displaying pronounced spatial variability in their respective speciation.The maximum proportion of bioavailable fractions of As,Cd,and Cu was identified in soils from the Le'an River basin(Dexing section),while Hg and Pb reached their highest proportions in the Dawu River and Fuxi River basins,respectively.The bioavailable fraction of Cr showed negligible variability across the three basins.Statistically significant correlations were observed among the chemical species of Cu,Hg,and Pb,indicating notable interactions.The interconversion among chemical species was predominantly regulated by soil environmental parameters such as pH and Eh,which also played a critical role in determining the mobility and bioavailability of heavy metals.The study concluded that mining activities in the Dexing region are the principal contributors to heavy metal contamination in local soils.Consequently,remediation strategies for polluted soils in this area should prioritize managing the release and equilibrium of carbonate-bound and organic matter-bound forms to mitigate environmental risks effectively.

关 键 词：土壤 重金属 化学形态 德兴铜矿 环境 

分 类 号：P595[天文地球—地球化学]