|
| 锡矿山土壤重金属生态健康风险评价及重金属在优势植物的分布 |
| Ecological and health risk assessment of heavy metals in soils and their distribution in dominant plants in the Xikuangshan mining area |
| 投稿时间：2020-12-28 |
| DOI：10.13254/j.jare.2020.0783 |
| 中文关键词: 重金属，潜在生态风险，累积，转移，锡矿山，优势植物，健康风险 |
| 英文关键词: heavy metals, potential ecological risks, accumulation, transfer, Xikuangshan, dominant plants, health risks |
| 基金项目:国家自然科学基金青年科学基金项目（41907037）；湖南省自然科学基金青年科学基金项目（2020JJ5268）；湖南省教育厅科学研究优秀青年项目（19B293）；湖南省高等学校科技创新团队（201937924） |
|
| 摘要点击次数: 1397 |
| 全文下载次数: 1363 |
| 中文摘要: |
| 为探明湖南锡矿山矿区周边土壤重金属污染程度及重金属在优势植物中的分布，通过野外调查，分析锡矿山地区土壤重金属的含量、来源、生态风险及重金属在优势植物中的富集和迁移情况。结果表明，锡矿山土壤中重金属Sb、Cd和Hg的平均值远超湖南省土壤背景值，超标率均达到100%。来源分析表明，Sb、Hg、Zn、Cd、Pb、As主要受人为活动的影响，但重金属污染来源不完全一致，存在复合污染。生态风险评价结果显示，Sb、Cd和Hg是锡矿山地区极高的生态风险因子，62.50%的样点具有极高生态风险。健康风险评价结果显示，经口摄入是土壤重金属暴露的主要途径，且儿童受到的非致癌和致癌风险均高于成人。Sb和As分别是主要的非致癌和致癌健康风险因子。苎麻对As、Sb的富集系数和转移系数值均大于1，且在重度污染地区的根系滞留率低于其他6种优势植物。研究表明，锡矿山地区存在较高程度的生态风险和健康风险，苎麻具有较高的修复矿区土壤重金属潜力，可作为锡矿山地区重金属污染的修复植物。 |
| 英文摘要: |
| In order to understand the characteristics of heavy metals in the soil around the Xikuangshan mining area(XKS) and their distribution in dominant plants, field investigations were conducted to analyze the quantities, sources, ecological and health risks, enrichment coefficients, and transfer factors of heavy metals in the dominant plants at 16 sampling points in the XKS. The results showed that the average concentrations of Sb, Cd, and Hg exceeded the corresponding background values of Hunan by 100%. The source analysis suggested that Sb, Hg, Zn, Cd, Pb, and As were mainly contributed by human activities. However, the sources of heavy metal pollution were not completely consistent, and there was combined pollution. The potential ecological hazard factor analysis showed that Sb, Cd, and Hg were the main single ecological hazard factors, and 62.50% of the samples possessed a very high comprehensive ecological risk index. The heavy metal health risk assessment results showed that the main pathway of human exposure was oral ingestion, and children were more susceptible to heavy metal pollution. Sb and As were the major non-carcinogenic and carcinogenic contributors, respectively. The enrichment coefficients and transfer coefficients of As and Sb in Boehmeria nivea were greater than 1, and their retention rates in heavily polluted areas were lower than those in the other six dominant plant species. Generally, there were severe ecological risks and health risks in the XKS. Boehmeria nivea has a strong potential for remediation of heavy metals and can be used as a remediation plant for heavy metal pollution in the XKS. |
| HTML
查看全文
查看/发表评论 下载PDF阅读器 |
| 关闭 |
|
|
|
