Pollution and health risk assessment of toxic metal(loid)s in soils under different land use in sulphide mineralized areas
Pollution and health risk assessment of toxic metal(loid)s in soils under different land use in sulphide mineralized areas
复制标题
硫化物矿化区不同土地利用方式土壤有毒金属污染及健康风险评价
DOI：
10.1016/j.scitotenv.2020.138176
复制
发表时间：
2020-07-01
影响因子：
9.8
通讯作者：
Peng, Jingquan
中科院分区：
文献类型：
--
作者：
Ma, Liang;Xiao, Tangfu;Peng, Jingquan
硫化物矿化区的有毒金属(Loid)污染日益受到人们的关注。采用统计分析、富集化因子(EF)、潜在生态风险指数(RI)和健康风险评价模型，对不同土地利用方式下受富Tl-Hg硫化物矿化影响的农村土壤中汞、砷、铊等金属(Loid)S的污染特征和健康风险进行了评价。结果表明，受历史上的零星采矿活动影响，矿区Tl、Hg、As元素高度富集，周边地区Tl、Hg、Sb元素含量较高。受过去采矿活动影响的矿区土壤中汞和铊污染具有很高的生态风险。林草地中Tl和Hg的高含量和富集度对矿区的生态风险影响较大，而粮地和菜地中的Tl和Hg对周边地区的土壤生态风险起主导作用。人体健康风险评估表明，儿童对土壤中的有毒金属(LOID)S比成年人更敏感和更容易受到伤害。汞、汞和砷对当地儿童和成人具有潜在的非致癌风险。不同途径接触有毒金属(LOID)S的HQ水平依次为摄入>；皮肤接触>；空气吸入Tl、As；皮肤接触>；空气吸入汞。对于致癌风险，矿区居民摄食的平均CR值均大于10(-4)，表明存在严重的潜在危险。ILCR通过不同途径的递减顺序与HQ相同，以摄入为主，其次为经皮吸入和空气吸入。这一发现可能有助于为类似硫化物矿化区的有毒金属(Loid)污染修复提供基础知识和指导方针。
Toxic metal(loid) pollution in sulphide mineralized area has been increasingly concerned. In the present study, the pollution characteristics and the health risk of Hg, As, Tl and other metal(loid)s in soils under different land use, from a rural area impacted by Tl-Hg-rich sulphide mineralization, were assessed using statistical analysis, enrichment factor (EF), potential ecological risk index (RI) and health risk assessment model. The results showed that Tl, Hg and As were highly enriched in the mine area due to the historic sporadic mining activities, and Tl, Hg and Sb were enriched in the peripheral area. Hg and Tl pollution in soils of the mine area impacted by past mining activities posed high ecological risk. High contents and enrichment of Tl and Hg in forest/grass land had a greater impact on the ecological risk in the mine area; whereas Tl and Hg in the grain land and vegetable land dominated the soil ecological risk in the peripheral area. Human health risk assessment indicated that children are more sensitive and vulnerable to toxic metal(loid)s in soils than the adults. Hg, Tl and As have potential non-carcinogenic risk to local children and adults. The HQ levels for different exposure pathways of toxic metal(loid)s were in the order of ingestion > dermal contact > air inhalation for Tl and As, and dermal contract > ingestion > air inhalation for Hg. For carcinogenic risk, all the mean CR values of ingestion in the mine area were higher than 10(-4), indicating seriously potential risk. The descending order of ILCR via different pathways was the same as the HQ, for which ingestion was predominant, followed by dermal and air inhalation. The findings may help provide basic knowledge and guidelines for toxic metal(loid) pollution remediation in similar sulphide mineralized areas.