北京市公园道路粉尘Cu,Pb,Zn含量及其污染评价

通过对北京市12个具代表性公园的道路粉尘取样调查,测定了粉尘中常量元素Fe,Ca,Mg,K及重金属Cu,Pb,Zn的质量分数以及pH值。结果表明,公园道路粉尘与表层土壤中的Fe,Ca,Mg,K的质量分数和pH值都非常接近,性质相似;公园道路粉尘中存在着一定的Cu,Pb,Zn含量积累现象,尤以Pb,Zn明显。综合污染指数大小的规律,总体上是市区公园道路粉尘高于市郊,市中心景山公园道路粉尘的污染指数最高。聚类分析结果显示,公园的聚类与其所处的交通位置关系密切。公园道路粉尘Cu,Pb,Zn质量分数的相关性较好,表明交通是造成公园道路粉尘中Cu,Pb和Zn含量积累的重要因素。 

Cu,Pb,Zn Contents in Road Dusts in Parks and Their Pollution Assessment in Beijing

The contents of major elements Fe,Ca,Mg,K and heavy metals Cu,Pb,Zn as well as pH value in the dusts were measured,based on sampling investigating of road dust in 12 representative parks in Beijing.The results indicate that the road dusts and topsoils are very similar in Fe,Ca,Mg,K contents and pH value and similar in character,and that Cu,Pb and Zn have accumulated in the road dusts,especially for Pb and Zn.The comprehensive pollution indexes of the parks located in downtown areas are larger than those of the parks in suburbs generally,and the highest value occurs in Jingshan Park.The result of the cluster analysis shows that the contents of Cu,Pb and Zn in road dusts have close relations with the traffic circumstances of the parks.The relative coefficients of the contents of Cu,Pb and Zn indicate that they have close relationship.The accumulation of Cu,Pb and Zn in road dusts may mainly come from traffic sources.