衡阳城区PM_(2.5)中重金属污染水平及健康风险  

HEALTH RISKS AND POLLUTION LEVEL OF HEAVY METALS IN PM_(2.5) IN HENGYANG CITY

作　　者：田蓉[1] 刘迎云[1] 陈攀[1] 张辉[2] 姜雨 

机构地区：[1]南华大学环境保护与安全工程学院,湖南衡阳421001 [2]南华大学铀矿冶生物技术国防重点学科实验室,湖南衡阳421001

出　　处：《环境工程》2017年第9期127-130,共4页Environmental Engineering

基　　金：湖南省教育厅科研项目重点项目(17A180)

摘　　要：为了解重化工业城市PM_(2.5)中重金属污染特征,2015年12月—2016年9月采集了衡阳城区3个点位的84个PM_(2.5)样品,检测了PM_(2.5)中9种重金属元素(Pb、Cd、Cu、Cr、Ni、Zn、Mn、Hg、As),并对其展开健康风险评价。结果发现:采样期间,衡阳城区PM_(2.5)质量浓度范围为18.10~325.72μg/m^3,平均质量浓度为89.65μg/m3。9种重金属平均质量浓度排序为:Zn>Cu>Pb>Mn>Cr>Ni>Cd>As>Hg,84个样品中Pb超标率为14.29%,Cd超标率为61.90%,As超标率为54.76%。9种重金属经呼吸暴露途径对人群的健康风险指数均低于风险阈值,不会对人体构成明显健康风险,但重金属Cr的风险指数趋近安全阈值,各风险指数均排序为成年男性>成年女性>儿童青少年。To understand the pollution characteristics of heavy metals in PM2.5of heavy and chemical industrial city,84 PM2.5samples and 9 heavy metals（ Pb,Cd,Cu,Cr,Ni,Zn,Mn,Hg and As） in PM2.5were collected and analyzed at three sites in Hengyang from December 2015 to September 2016,and health risks of 9 heavy metals through breathing were assessed. The results showed that the concentrations of PM2.5ranged from 18. 10 μg/m3 to 325. 72 μg/m3,the average concentration was89. 65 μg/m. The mass concentrations of 9 heavy metals in PM2.5followed the order of Zn Cu Pb Mn Cr Ni Cd As Hg,and Pb,Cd,As exceeded the second reference values of National Ambient Air Quality Standards,the excessive rates of Pb,Cd,As were 14. 29%,61. 90% and 54. 76%,respectively. Health risk assessment results showed that the risk indexes of 9heavy metals（ Pb,Cd,Cu,Ni,Zn,Cr,Mn,Hg and As） in PM2.5through breathing were lower than risk threshold,there were no significant health risks for human beings. However,the risk index of Cr had approached the safety threshold. The health risk indexes of 9 heavy metals all followed the order of adult male adult female children and adolescent.

关 键 词：工业城市 PM2.5 重金属 污染水平 健康风险 

分 类 号：X513[环境科学与工程—环境工程]