中国地质2025，Vol.52Issue(3)：834-848,15.DOI:10.12029/gc20230703001
湖南省龙山县土壤重金属特征与健康风险评价
Characteristics and health risk evaluation of soil heavy metals in Longshan County,Hunan Province
摘要
Abstract
This paper is the result of geological survey engineering. [Objective]A total of 775 soil samples were collected in Longshan County to analyze the content characteristics of heavy metals in soil,including As,Cd,Cr,Cu,Hg,Ni,Pb,and Zn,and to evaluate the health risks associated with these contaminants.[Methods]The geo-accumulation index was applied to assess soil heavy metal pollution levels.Correlation analysis and principal component analysis were used to identify the sources of soil heavy metals.A health risk model was employed to evaluate the potential risks posed by these metals to human health.[Results]The analysis revealed that the average Cd concentration in Longshan County soils significantly exceeds the background value for Hunan Province,indicating a certain degree of Cd enrichment.The variation coefficients for As and Cd exceeded 0.5,while Hg's coefficient surpassed 1,suggesting a potential influence from human activities.Various degrees of contamination by As,Cd,Cr,Cu,Hg,Ni,Pb,and Zn were identified,with widespread Cd pollution and severe Hg contamination in certain areas.The sources of these heavy metals were categorized into three groups:(1)Cr,Cu,and Ni primarily originate from soil parent materials;(2)As,Cd,Pb,and Zn are largely linked to lead-zinc mining and smelting,with Cd also showing some association with geological background;(3)Hg primarily stems from fossil fuel combustion.The health risk assessment indicated that children face higher risks from soil heavy metals compared to adults.Attention should be focused on the health risks in Liye Town,Miaoertan Town,and Luota Town.As and Cr were identified as the primary contributors to non-carcinogenic risks,while Cr and Ni were the main contributors to carcinogenic risks.Oral ingestion was found to be the dominant exposure pathway for health risks.[Conclusions]Heavy metal pollution in Longshan County soils exists at varying levels.As,Cd,and Ni are the primary contributors to health risks.关键词
土壤重金属/镉-铅-锌/砷-汞/污染评价/来源/健康风险评价/地质调查工程/龙山县/湖南省Key words
soil heavy metals/Cd-Pb-Zn/As-Hg/pollution evaluation/source/health risk assessment/geological survey engineering/Longshan County/Hunan Province分类
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许青阳,戴亮亮,彭志刚,张俊,肖凯琦,巩浩,吴欢欢..湖南省龙山县土壤重金属特征与健康风险评价[J].中国地质,2025,52(3):834-848,15.基金项目
中国地质调查局项目(DD20211576、DD20230480)资助. Supported by the projects of China Geological Survey(No.DD20211576,No.DD20230480). （DD20211576、DD20230480）
