临潼区绿化带土壤重金属污染与健康风险评价

The soil heavy metal pollution level and health risk assessment of greenbelt in Lintong district

针对城市绿化带土壤重金属污染问题,该文利用射线荧光光谱仪测量重金属含量,引用单因子与负荷污染指数法并依据国家标准进行污染评价;引入人体暴露风险评价模型,对致癌和非致癌健康风险进行评价。结果表明,研究区土壤重金属污染较严重;经手-口直接摄入是健康风险的主要暴露途径,儿童总的非致癌风险为0.573,成人总的非致癌风险为0.088,均未超过限制1,表明8种重金属不存在明显的非致癌风险;Cr、Co、Ni、As的致癌风险均低于美国环境保护部推荐标准10-6,表明重金属的致癌风险均在可接受范围内。研究区内土壤重金属含量及污染状况空间分异显著。研究结果对城市绿化带内土壤重金属污染评价有一定借鉴意义。

Aiming at the issue of greenbelt soil heavy metal pollution in the urban area,this paper used ray fluorescence spectrometerto measure the content of heavy metals,the single factor and load pollution index methods were used to evaluate pollution according to the national standards.the human exposure risk assessment model was introduced to evaluate the risk of cancer and non-carcinogenic health.Soil heavy metal pollution was serious in the study area,and direct oral intake was the main exposure route for health risks,the total non-carcinogenic risk of children was 0.573,and the total non-carcinogenic risk of adults was 0.088,which did not exceed the limit of 1,the results indicated that there were no obvious non-carcinogenic risks in 8 heavy metals.the carcinogenic risks of Cr,Co,Ni and As were lower than the standard 10-6 that was recommended by the US Environmental Protection Agency,indicating the carcinogenic risk of heavy metals was within the acceptable range.The spatial differentiation of soil heavy metal content and pollution status were significant in the study area.This paper had certain reference significance for the evaluation of soil heavy metal pollution in the urban greenbelt.