南京市PM_(2.5)中重金属含量分布及溶出规律研究  

Distributions and Dissolving Laws of Heavy Metals in PM_(2.5) in Nanjing

作　　者：陆喜红[1] 任兰[1] 吴丽娟[1] 胡晓乐[1] LU Xi-hong;REN Lan;WU Li-juan;HU Xiao-le(Nanjing Environmental Monitoring Center,Nanjing 210013 , China)

机构地区：[1]南京市环境监测中心站,南京210013

出　　处：《四川环境》2018年第6期65-69,共5页Sichuan Environment

基　　金：南京市环保局环保科研项目(201604)

摘　　要：自2017年1～10月,采集南京市PM_(2.5)样品共计42批次,分析了Cu、Zn等9种重金属的含量分布及其溶出规律。结果表明,PM_(2.5)质量浓度呈现明显季节特征,冬季高,夏季低,年均值为41μg/m^3,与国家二级标准比超标17%。南京市PM_(2.5)中重金属总量高低顺序为Fe> Zn> Pb> Mn> Cu> Cr> As> Ni> Cd,其中As超出推荐限值19%。在模拟酸雨提取PM_(2.5)中重金属时,淋溶液pH是决定释放率的最主要因素,pH越低,释放率越高。用pH 5. 6的模拟酸雨淋溶液提取南京市PM_(2.5)样品,Cd、Zn、Mn的释放率超过60%,而Fe、Cr、Pb的释放率低于30%。42 batches of PM2.5 samples in Nanjing were collected from January to October 2017,nine kinds of heavy metals were analyzed,and dissolving laws of them were studied.The results showed that the mass concentration of PM2.5 had significant seasonal characteristics,higher in winter,and lower in summer,with the annual average concentration of 41μg/m3,which was 17%higher than the national second-level standard.The heavy metal concentrations in PM2.5 showed the following order:Fe>Zn>Pb>Mn>Cu>Cr>As>Ni>Cd,with As exceeding the limiting value by 19%.When heavy metals in PM2.5 were extracted from simulated acid rain,pH of the solution was the most important factor to determine the release rate,the lower the pH,the higher the release rate.PM2.5 samples in Nanjing were extracted with pH 5.6 simulated acid rain solution,and the release rate of Cd,Zn and Mn were more than 60%,while the release rate of Fe,Cr and Pb were less than 30%.

关 键 词：南京 PM2.5 重金属 溶出 

分 类 号：X831[环境科学与工程—环境工程]