兰山区大气降尘重金属环境特征分析

为探究大气降尘中重金属污染程度,在临沂市兰山区设置15个采样点采集大气降尘,分析降尘重金属含量。结果表明,兰山区大气降尘中Cr,Ni,Cu,Hg含量平均值分别为38.40,61.46,36.15,0.76 mg/kg;兰山区大气降尘重金属含量的变异程度较大,空间分布极不均匀;除大气降尘中Hg均值低于相应土壤均值外,其他均高于土壤。大气降尘重金属样品的分析表明Cu,Hg为一类,主要受交通和工业污染的影响;Ni为一类,主要受交通活动的影响。

In order to evaluate the contamination of heavy metals from atmospheric deposition in Lanshan district of Linyi city, samples of atmospheric deposition were collected from 15 sampling sites respectively and their concentrations of heavy metals were determined. The results showed that the average contents of Cr,Ni,Cu,Hg were 38.40, 61.46, 36.15, 0.76 mg/kg;the content of heavy metals in all the atmospheric dust samples had a large degree of variation and uneven spatial;except for Hg in atmospheric dust, the contents of all the heavy metals in atmospheric dust were higher than the ones in soil distribution. The experimental results about atmospheric dust samples show that heavy metals such as Cu, Hg fall into one category,and their contents mainly originated from traffic and industrial emission. Ni belong to another category, which mainly originated from traffic emissions.