摘要
为了解南京市道路积尘负荷水平及重金属污染特征,在南京市各级道路采集了108个道路积尘样本过筛称重,利用ICP-MS对道路积尘中重金属浓度进行测定,采用健康风险评价模型,得到南京道路积尘健康风险评价结果。结果表明,除溧水区快速路因渣土车数量过多及周边施工工地过多而导致的积尘负荷过高外,其他道路积尘负荷均呈现快速路<主干道<次干道<支路。As、Cd、Cr、Cu、Ni、Pb和Zn的含量均值分别为17.35、1.41、180.39、144.59、53.42、91.79和449.70 mg/kg,与江苏省背景值相比均呈现超标情况。地累积指数I_(geo)均值依次为Cd>Zn>Cu>Pb>Ni>Cr>As,且7种重金属I_(geo)均值均大于0,呈现出明显的污染状态。潜在生态风险E_(i)均值依次为Cd>Cu>As>Pb>Ni>Zn>Cr,均呈现出极强的潜在生态风险,单因子Cd是主要的生态风险来源。道路积尘重金属对人群不造成显著健康风险,其中Cr和As成为道路积尘重金属非致癌风险的主要贡献因子。儿童群体的总致癌风险约是普通成人的2倍,道路工作人员约是普通成人的8倍。
To study the level of road dust accumulation load and heavy metal pollution characteristics in Nanjing, 108 road dust accumulation samples were collected at all levels of roads in Nanjing, sieved and weighed, and heavy metal concentrations in road dust accumulation were measured by ICP-MS.The health risk evaluation model was used to obtain the health risk evaluation results of road dust accumulation in Nanjing.The results showed that the dust accumulation load of all roads showed that the dust accumulation load of expresswaysZn>Cu>Pb>Ni>Cr>As, and the mean values of I_(geo)of seven heavy metals were greater than 0,showing an obvious contaminated state.The mean values of potential ecological risk E_(i)are Cd>Cu>As>Pb>Ni>Zn>Cr in order, all presenting strong potential ecological risk, and the single factor is the main source of ecological risk.Heavy metals from road dust accumulation did not pose significant health risks to the population, where Cr and As, which caused the greatest heavy metal pollution, became the main contributors to the non-carcinogenic risk of heavy metals from road dust accumulation.The total carcinogenic risk was about two times higher in the children population and about eight times higher in the road workers than in the general adult population.
作者
曹炜琦
崔云霞
赵修齐治蓁
彭欣
吴子伯
CAO Wei-qi;CUI Yun-xia;ZHAO Xiu-qizhizhen;PENG Xin;WU Zi-bo(School of Environment,Nanjing Normal University,Nanjing 210023,China)
出处
《环境生态学》
2022年第6期1-8,共8页
Environmental Ecology
基金
国家重点研发计划课题(2020YFF0218300)资助。
关键词
道路积尘
积尘负荷
重金属
污染评价
健康风险评价
Road dust accumulation
dust accumulation load
heavy metals
pollution evaluation
health risk evaluation
