贵阳城市街道灰尘重金属年际变化研究

摘要

In order to find out the inter annual variation of heavy metal elements in urban street dust of Guiyang City,based on the sampling data of 2008 and 2011,8 kinds of heavy metal elements were analyzed by software.The results showed that:(1) Except for As and Pb,the contents of 6 kinds of heavy metal elements in Guiyang city were different than the background values of heavy metals in soil,and the content of Cd was the highest.(2) In 2011,the content of Hg,Cd,Zn and Ni in the street dust was increased compared with that in 2008,while the other 4 kinds were decreased,and the inter-annual variations of As and Cd contents were most obvious.(3) The correlation analysis between the elements of the street dust in 2008 shows that 6 elements such as Hg,Cd,Cr,Cu and Zn may be the same source,As and Pb.The correlation analysis between the elements of the street dust shows that the 8 elements are the same source in 2011.%为探究贵阳城市街道灰尘重金属元素含量的年际变化,以2008年和2011年采样数据为基础,通过相关软件对8种重金属元素含量数据进行分析,结果表明:(1)除As、Pb外的6种元素含量均超过贵阳市土壤背景值.(2)2011年街道灰尘中Hg、Cd、Ni、Zn含量较2008年有所增加,另外4种则降低;Cd、As含量的年际变化最明显.(3)2008年街道灰尘中各重金属元素间的相关性分析显示,Hg、Cd、Cr、Cu和Zn等6种元素可能为同一来源,As和Pb同一来源;而201 1年街道灰尘各元素间的相关性分析则说明8种元素均为同一来源.