摘要
目的:调查广西DC矿区周边村屯土壤砷、铅、镉重金属的含量水平,评估其对儿童产生的潜在健康风险。方法:采集DC矿区周边村屯的表层土壤(0~20cm),测定As,Pb,Cd的含量,并运用美国环保署(US EPA)推荐的健康风险评价模型评估该村儿童(3~6岁)因土壤经多种途径暴露重金属所引起的非致癌和致癌风险。结果:不同村屯土壤中As,Pb,Cd的含量差异具有统计学意义(P<0.05)。土壤中As,Pb,Cd的含量均有超标的现象,超标率分别为97.9%(47/48),85.4%(41/48),100%(48/48)。土壤中重金属的总非致癌风险、总致癌风险和总健康风险分别为6.85×10^(-6)/年、4.08×10^(-3)/年和4.09×10^(-3)/年。非致癌和致癌风险均主要来源于镉,相应的风险贡献率分别为84.3%和97.76%;经口摄入是研究区儿童土壤暴露风险的最主要途径。结论:该矿区周边村屯土壤主要受到了As,Pb,Cd的污染;土壤中重金属对儿童的总健康风险大于US EPA推荐的最大可接受风险水平(1.0×10^(-4)/年),可对当地儿童健康造成显著的危害。
The objective is to investigate the contents of arsenic,lead and cadmium in soil of villages around DC mining area in Guangxi,and assess potential health risks to children.Test methods were used to collect surface soil(0~20cm)of villages around DC Mining area.The contents of As,Pb and Cd were determined,and the health risk assessment model recommended by US EPA was used to evaluate the non-carcinogenic and carcinogenic risks of children (3~6years old)exposed to heavy metals through various ways in the soil collected.Results:the contents of As,Pb and Cd in soil of different villages were significantly different(P<0.05).The content of As,Pb and Cd in soil exceeded the standard,with the rates of 97.9%(47/48),85.4%(41/48)and 100%(48/48),respectively.The total non-carcinogenic risk,total carcinogenic risk and total health risk of heavy metals in soil were 6.85×10^(-4)/year,4.08×10^(-4)/year and 4.09×10^(-4)/year,respectively.Cadmium was the main source of non-carcinogenic and carcinogenic risks,and the corresponding risk contribution rate was 84.3%and 97.76%,respectively;Oral ingestion was the most important route of soil exposure risk for children in the study area.Conclusion:the soil around the mining area is mainly polluted by As,Pb and Cd.The total health risk to children from heavy metals in soil is greater than the maximum acceptable risk level recommended by US EPA (1.0×10^(1)year).The total health risk to children from heavy metals in soil is greater than the maximum acceptable risk level recommended by US EPA (1.0×10^(-4)/year),which can cause significant harm to local children’s health.
作者
汤治仙
张新英
宋勇进
梁秋怡
陈天来
TANG Zhi-xian;ZHANG Xin-ying;SONG Yong-jin;LIANG Qiu-yi(School of Geography and Planning,Nanning Normal University,Nanning 530001,China;Guangxi Sports College,Nanning 530001,China)
出处
《南宁师范大学学报（自然科学版）》
2021年第4期96-103,共8页
Journal of Nanning Normal University：Natural Science Edition
基金
2021年度广西高校中青年教师科研基础能力提升项目(2021KY0920)。
关键词
土壤
重金属
健康风险评价
soil
heavy metal
health risk assessment
