杭州市大气颗粒物浓度及组分的粒径分布

分别于2008年11月及2009年4~5月及10月采集了杭州大气颗粒物样本,测定了杭州市大气颗粒物及其化学组分元素碳(EC)/有机碳(OC)、11种水溶性离子、20种元素]的浓度,并研究了其粒径分布特征.结果表明,杭州市大气颗粒物质量浓度、EC和OC的质量浓度、9种离子(SO42-、NO3-、K+、Na+、Cl-、Ca2+、Mg2+、NO2-、F-)浓度的粒径分布均显双峰结构,峰值分别出现在<0.49μm的细粒径段与3.00~7.20 μm的粗粒径段; OC、EC、SO42-、NO3-、NH4+以及主要来自人为源的元素(Cu、Zn、As、Se、Sb、Cd)主要集中在<3.0μm的细颗粒物中;杭州市大气细颗粒物中二次污染严重,细颗粒物主要受工业、交通等人为源影响.

Size distributions of concentrations and chemical components in Hangzhou atmospheric particles

Size distributions of mass concentrations and chemical components in Hangzhou atmospheric particles were determined. The chemical components consisted of organic carbon (OC) and elemental carbon(EC), 11kinds of water-soluble ions, and 20kinds of trace elements. The size distributions of mass concentrations appeared significantly a bi-modal with peaks in the particles with size of <0.49μm and 3.00~7.20μm, respectively, as well as those of chemical components of OC, EC, SO42-, NO3-, K+, Na+, Cl-, Ca2+, Mg2+, NO2- and F-. The OC, EC, SO42-, NO3-, NH4+ and trace elements of Cu, Zn, As, Se, Sb, Cd derived from anthropogenic sources mainly focused in fine particulate matters (<3.0μm), so this suggested that a serious secondary pollution existed in the fine particles, and the fine particles were mainly affected by the anthropogenic sources derived from industrial and traffic pollutions.