摘要
为了解运城盐湖湿地土壤中重金属污染状况,于2023年4月对研究区表层土壤进行了取样,分别测定了 36个土壤样品所含的8种重金属元素,包括砷(As)、镉(Cd)、锌(Zn)、铅(Pb)、铬(Cr)、铜(Cu)、镍(Ni)和汞(Hg).根据不同筛选值以潜在生态风险指数法和健康风险模型对研究区内土壤重金属的生态风险和健康风险进行了评价,该评价结果为当地的环境治理与生态恢复提供了科学依据,也为当地的人体健康风险管控提供了重要参考.结果表明:运城盐湖湿地表层土壤呈强碱性,研究区土壤中8种重金属的平均含量从高到低依次是:Zn＞Cr＞Pb＞Cu＞Ni＞As＞Hg＞Cd,其中Zn与Cr的平均含量占比超53.21％.研究区土壤中重金属含量的空间分布差异大,南部区域的含量最高.以国家土壤质量筛选值对研究区土壤重金属状况评价后发现,单一和综合潜在生态风险等级仅为轻微.研究区土壤中单一和复合重金属污染对成人及儿童无致癌风险.单一重金属污染对成人及儿童的非致癌风险在可接受范围之内,但复合重金属污染可能对儿童产生了非致癌风险.
Abstract
This study investigates the status of heavy metal pollution in the soils of Yuncheng Salt Lake Wetland.In April 2023,surface soil samples from the area were collected and analyzed for eight heavy metals,namely arsenic(As),cadmium(Cd),zinc(Zn),lead(Pb),chromium(Cr),copper(Cu),nickel(Ni),and mercury(Hg).Utilizing the potential ecological risk index method and a health risk model,we evaluated both the ecological and health risks posed by soil heavy metals,providing valuable insights for local environmental management,ecological restoration,and human health risk mitigation.The findings indicate that the wetland's surface soil is strongly alkaline,with the average concentrations of the eight studied heavy metals ranking as follows:Zn＞Cr＞Pb＞Cu＞Ni＞As＞Hg＞Cd,where Zn and Cr together constitute over 53.21％of the total.The spatial distribution of these metals in the soil shows minimal variation,with the highest concentrations found in the southern part of the study area.According to national soil quality benchmarks,both the individual and combined potential ecological risks in the area are deemed minor.Moreover,the analysis suggests no carcinogenic risk to either adults or children from exposure to these heavy metals.However,while the non-carcinogenic risk from individual metals is considered acceptable,exposure to combined metals could present a non-carcinogenic risk to children.
基金项目
中央引导地方科技发展资金自由探索类基础研究资助项目(YDZJSX20231A002)
运城盐湖生态环境本底调查与研究项目()
NETL
NSTL
万方数据