湖南某矿区土壤重金属污染及健康风险评价
作者:
作者单位:

1.辽宁师范大学;2.中国地质调查局武汉调查中心

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基金项目:

中国地质调查局花岗岩成岩成矿研究中心开放基金课题(PMGR202009、PMGR202108,PMGR202115), 中国地质调查局地调项目(DD20190154) 联合资助。


Health risk assessment of heavy metal pollution in soil of a Mining area in Hunan Province
Author:
Affiliation:

1.Liaoning Normal University;2.Wuhan Center of Geological Survey, China Geological Survey

Fund Project:

Supported by Open Fund of the Research Center for Petrogenesis and Mineralization of Granitoid Rocks, China Geological Survey (PMGR2020009, PMGR202108, PMGR202115) and the Geological Survey of China Ground Investigation Project (No.DD20190154).

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    摘要:

    【研究目的】本文采集表层土壤114件、柱状土壤3组,分析测定Cu、Pb、Zn、Cr、Cd、As、Hg等7种重金属元素含量;评价锡矿区周边土壤重金属污染状况与风险。【研究方法】采用地累积指数法、潜在生态风险指数法和健康风险评估模型,对该地区污染程度、潜在生态风险和人体健康风险进行评价。【研究结果】①研究区土壤重金属平均含量表现为As>Zn>Pb>Cu>Cr>Cd>Hg;②就空间分布而言,Cu、Pb、Zn、Cd和As富集区主要分布于矿区附近,含量随深度增加而降低,在60cm之下趋于稳定;Cr富集区主要分布于人口较密集的生活区,Hg分布均匀,无明显富集区;③地累积结果显示,研究区As和Cd呈极重污染,Cu、Pb和Zn呈轻-极重污染,Cr和Hg呈现无-轻度污染;④潜在生态结果显示,研究区整体处于极重污染水平,As和Cd生态风险最为突出;⑤健康风险评估显示,土壤中As 和Pb为主要非致癌因子,As为主要致癌因子;As元素非致癌与致癌风险最大,经口摄入为最主要的暴露途径,儿童健康更易受到重金属污染的威胁。【结论】研究区7种重金属均在一定程度上受到人为因素的影响,As和Cd受人为影响程度最大,其次为Pb、Zn和Cu,Cr和Hg受人为影响较弱。

    Abstract:

    [Objective] In this paper, the status and risk of heavy metal pollution in the soil around the tin mining area was determined by 7 heavy metal elements such as Cu, Pb, Zn, Cr, Cd, As and Hg of 114 pieces of surface soil and 3 groups of column soil. [Methods] the pollution level, potential ecological risk and human health risk in the area was evaluated via the Geo-accumulation index method, potential ecological risk index method and health risk assessment model. [Results] The average content of soil heavy metals in the study area manifested that As > Zn > Pb > Cu > Cr > Cd > Hg. In terms of spatial distribution, the Cu, Pb, Zn, Cd and As elements concentrated near the mine area and their contents decrease with increasing depth and tend to be stable below 60cm. The Cr element is mainly distributed in congested area. The Hg element is uniformly distributed. The results of the cumulative land show that the As and Cd elements are heavy level polluted, and the Cu, Pb and Zn elements are lightly-heavy level polluted, and the Cr and Hg elements show no-light level pollution in the study area. Potential ecological results show that the study area is at heavy pollution levels, with the most severe ecological risks of As and Cd elements. Health risk assessment shows that the As and Pb elements in soil are the main non-carcinogenic factors and the As element is the main carcinogenic factor. The As element is the main risk of non-carcinogenic and carcinogenicity. The oral ingestion is the main route of exposure, and children are more vulnerable to heavy metal pollution. [Conclusion] To some extent, all seven heavy metals in the study area were affected by anthropogenic factors. The As and Cd elements are the most influenced by humans, and the Pb, Zn and Cu followed. The Cr and Hg elements were weakly affected by humans.

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  • 收稿日期:2022-08-25
  • 最后修改日期:2023-02-15
  • 录用日期:2023-03-02
  • 在线发布日期: 2023-03-02
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