摘要：为了解杭州市大气悬浮颗粒物PM_2.5污染状况及化学组成特征,2006年在杭州市内布设2个监测点位,按季节进行采样,并对悬浮颗粒物PM_2.5中20种元素进行定量研究。结果表明:杭州市区大气中悬浮颗粒物PM_2.5的年均质量浓度值为77.5μg/m³,其中S、Si、Ca、K等元素年平均质量浓度大于1.0μg/m³。元素Si、Al、Fe、Mg、V、K、Na、Ti、Mn、Ca、P、Cr、Ni主要来源于地壳,而元素Cl、Cu、Zn、Pb、As、Br、S、Se等主要来源于人为排放源。

关键词： 大气悬浮颗粒；污染状况；化学组成

Abstract： In order to study the pollution status and chemical composition of airborne particles PM_2.5 in Hangzhou City， two stations were selected to process seasoal sampling in 2006， and the content of 20 kinds of elements in PM_2.5 was analyzed quantitively. The results showed that the annual average mass concentration of PM_2.5 was 77.5 μg/m³. The average mass concentrations of S， Si， Ca， K were greater than 1.0 μg/m³。The elements such as Si， Al， Fe， Mg， V， K， Na， Ti， Mn， Ca， P， Cr， Ni originated from mainly the earth's crust， Cu， Zn， Br， Pb， As， S， Se originated from mainly artificial sources.

Keywords： airborne particles； pollution status； chemical composition