鼎湖山地区大气颗粒物中水溶性无机盐粒径分布特征  

Size Distributions of Water Soluble Ions of Atmosphere in the Mountain Dinghu

作　　者：刘鲁宁[1,2] 郝庆菊[1] 刘子锐[2] 刘全[2] 张德强[3] 

机构地区：[1]西南大学资源环境学院,重庆400716 [2]中国科学院大气物理研究所,北京100029 [3]中国科学院华南植物园鼎湖山观测站,广东526070

出　　处：《中国农学通报》2010年第17期357-361,共5页Chinese Agricultural Science Bulletin

基　　金：国家"863"高技术研究发展计划项目"大气复合污染关键气态污染物的快速在线监测技术"(2006AA06A301);国家"973"重点基础研究发展规划项目"区域复合污染的多界面过程及多介质传输机制"(2007CB407303)

摘　　要：为研究珠江三角洲大气颗粒物的化学组成特征及其来源,2008年10-11月利用Andersen分级撞击式颗粒物采样仪,在中科院华南植物研究所鼎湖山区域大气本底观测站对大气中的颗粒物进行了分级(8级)采样,并对各粒径段颗粒物中水溶性无机盐进行了分析。结果表明:SO42-、NH4+在小于1.1μm的细粒子中出现浓度峰值;K+在0.65～1.1μm和4.7～5.8μm两个粒径段出现峰值;而NO3-、Na+、Cl-、Mg2+和Ca2+的浓度峰值出现在4.7～5.8μm粒径段。观测期间,SO42-的峰值存在着"凝结模态"和"液滴模态"的相互转变,来自广州方向的高湿气团可能是形成液滴模态的重要原因。In order to study on the characteristics of chemical compositions and the sources of the atmospheric particles in Pearl River Delta Region （PRD）, particle samples were collected with Andersen cascade impactor （8 classes） from the atmosphere in the Mt. Dinghu, the atmospheric baseline monitoring station of PRD region, during the autumn （ from Oct. to Nov.） of 2008, in Guangdong Province. Water soluble ionic concentrations were analyzed in the different size particles. The results indicated as following： ①The highest concentration of SO42-and NH4＋ appeared mainly when the fine particles with the size under 1.1 μm. ②The concentration of K＋ was two modes with the higher concentration at 0.65-1.1 μm, 4.7-5.8 μm; ③The concentration of NO3-、Na＋、 Cl-、Mg2 ＋ and Ca2 ＋ presented mainly within coarse particles with the peak at 4.7-5.8 μm. The peak of SO42-mutual transform between the ＂condensation mode＂ and ＂droplet mode＂, and the droplets mode produced when the humidity air mass from Guangzhou direction.

关 键 词：鼎湖山 气溶胶 水溶性无机盐 粒径分布 

分 类 号：X513[环境科学与工程—环境工程]