杭州地区大气气溶胶中重金属含量特征研究

对2004年8月～2005年5月间在杭州城区采集的大气气溶胶样品进行了7种重金属元素组成、形态等方面的分析测定;总结了大气气溶胶中各金属元素浓度的季节变化、形态分配比例和影响因素。研究结果表明：杭州市大气气溶胶浓度较高,平均值0.264 mg/m^3。气溶胶质量浓度呈明显的季节变化;气溶胶中各重金属元素的含量水平由高到低依次为：Fe、Zn、Pb、Mn、Cu、Cr和Cd;杭州市大气气溶胶中各重金属元素含量的季节变化在人为源和天然源以及气候条件等综合作用下具有一定的规律性,总体而言,春秋季高于夏冬季;各元素的形态分配比例跟它们本身的环境地球化学性质密切相关,同时也会受到气象和人为因素的影响。

Study on Character of Heavy Metal Content in Atmospheric Aerosol of Hangzhou City

All the atmospheric aerosol samples were collected in the city of Hangzhou from Aug.2004 to May 2005.The content and speciation of seven heavy metal elements were measured by ICP-AES.The change law of each season,distribution in speciation and their cause were all systematically analyzed.The results show that the concentration of atmospheric aerosol in Hangzhou which fluctuates with season is higher relatively and the average content is 0.264 mg/m^3.The order from high to low of heavy metal elements content arrays as Fe,Zn,Pb,Mn,Cu,Cr and Cd.The concentration of the metal elements in different seasons have their own different feature,all in all,spring and autumn summer and winter.The proportion of speciation sort are determined by environmental geochemistry feature and impacted by weather or anthropogenic factor.