河北省南部平原区大气降尘来源及分布特征

The distribution and source of atmospheric dustfall in the southern plain of Hebei Province

从2007年11月到2008年11月,采用被动方式在河北省南部平原区域采集了48个点的大气沉降样品,分析了Al、K、Ca、Cr、Cd、Pb、Se、Mo、I、F、S等21种元素的含量。在计算了各元素之间相关性和富集因子的基础上,得出河北南部平原区大气降尘的物质来源以土壤颗粒物为主,在此基础上叠加了燃煤污染。大气降尘输入通量的结果表明,河北省南部平原区的大气质量明显低于北京平原区。省内对比表明,沧州地区绝大多数元素输入通量最大,而邯郸地区最低,省会石家庄以燃煤元素(Cd、Hg、Mo、Se)的输入通量最大为特征。

From November 2007 to November 2008,the authors collected 48 samples of atmospheric dustfal in the southern plain of Hebei Province.All dustfall samples were analyzed for concentrations of Al,K,Ca,Cr,Cd,Pb,Se,Mo,I,F and S.The calculation of related coefficients and enrichment factors indicates that the primary source of the atmospheric dustfall is soil in the southern farmland,and some elements may be polluted by coal burning.The calculation of annual fluxes of elements show that the atmosphere quality of southern plain is obviously lower than that of the plain area of Beijing.The multi-elements annual fluxes are maximum in Changzhou City,and minimum in Handan City.The elements assemblage in Shijiazhuang City is characterized by Cd,Hg,Mo and Se,with the elements annual fluxes being maximum.