大气颗粒物中重金属元素在不同粒径上的形态分布

采用DFJ 1型五段分级采样器 ,对衡阳市区冬、夏两季空气中不同粒径颗粒物中重金属元素的组成和化学形态进行了分析。应用ICP AES法测定了各形态中元素的含量 ,计算了元素在各种形态中的分配比例。结果表明 ,衡阳市大气环境中多数重金属元素的含量冬季明显高于夏季。对人体危害较大的金属元素主要富集在小于 2 0 μm的细颗粒上 ,Mn、Zn、Cu和Co主要分布在氧化态、水可溶态、碳酸盐态和有机态中 ,Pb和V主要分布在不溶态中

DISTRIBUTION OF HEAVY METAL ELEMENTS IN THE DIFFERENT DIAMETRAL ATMOSPHERIC PARTICULATE MATTERS

Heavy metal element composition and species in the diferent diameter airbonre particle were samled and measured in the atomosphere of Hengyang urban districts using DFJ-I five-stage classificantion air sampler in winter and summer.Analyses were carried out by ICP-AES method,and distribution proportions of elements in five phases were calculated.The results showed that the contents of most of heavy metal elements were higher in winter than in summer.The metals of being harmful to human body mainly concentrated in the ≤2.0 μm particles.Mn,Zn,Cu and Co mainly distributed to oxide phase,dissoluble phase,carbonate phase and organic phase.Pb and V mainly distributed to indissoluble phase.