济南市秋季大气颗粒物中水溶性离子的粒径分布研究  

Size distributions of water-soluble inorganic ions of atmospheric aerosol particles in autumn in Jinan

作　　者：于阳春[1] 董灿[1] 王新峰[1] 杨凌霄 王文兴[1,2] 

机构地区：[1]山东大学环境研究院,山东济南250100 [2]中国环境科学研究院,北京100012

出　　处：《中国环境科学》2011年第4期561-567,共7页China Environmental Science

基　　金：国家"973"项目(2005CB422203);山东省环境保护科技计划项目(2006045)

摘　　要：为了解济南市大气颗粒物的粒径分布特征,于2009年10月利用多级撞击式颗粒物采样器（MOUDI）进行了大气颗粒物采集,采用离子色谱仪分析了其中水溶性离子浓度.结果表明,SO42-、NO3-、NH4＋和Ca2＋是主要的水溶性离子,浓度总和约占总水溶性离子浓度的92%.SO42-、NO3-、NH4＋、K＋和Cl-浓度随时间变化较为显著,浓度变化主要原因是受风速以及气流来源方向的影响.SO42-和NH4＋主要集中在细粒子中,其浓度呈单模态分布,随着颗粒物中含量的升高其峰值从0.32～0.56μm粒径段逐渐移动到1～1.8μm粒径段.NO3-浓度呈双峰分布,细粒子中的NO3-随着浓度的升高峰值从0.56～1μm粒径段移动到1～1.8μm粒径段,粗粒子中的峰值出现在3.2～5.6μm粒径段.NH4＋可以完全中和细粒子中的SO42-和NO3-,在细粒子中主要以（NH4）2SO4和NH4NO3的形式存在.Aerosol samples were collected in urban Jinan during October 2009 by a 8-stage Micro-Orifice Uniform Deposit Impactor.To characterize mass size distributions of water-soluble inorganic ions of atmospheric aerosol particles,the ions were analyzed by ion chromatography.SO42-,NO3-,NH4＋,and Ca2＋ were the most abundant ions which accounted for 92% of the total water-soluble ions.The concentrations of SO42-,NO3-,NH4＋,K＋,and Cl-showed a sharp change,which was influenced mainly by wind speed and direction.The size distributions of SO42-and NH4＋ were single-modal,and the major fraction was present in the fine mode.The peaks in SO42-and NH4＋ shifted from 0.32-0.56 μm to 1-1.8 μm when their mass concentration increased.The size distributions of NO3-were bi-modal.Its peak in the fine-mode shifted from 0.56-1 μm to 1-1.8 μm when the mass concentration increased.The NO3-peak in coarse-mode was at 3.2-5.6 μm.In addition,our study results show that NH4＋ could completely neutralize SO42-and NO3-in fine particles,as（NH4）2SO4 and NH4NO3 aerosol particles.

关 键 词：大气颗粒物 水溶性离子 粒径分布 济南市 

分 类 号：X513[环境科学与工程—环境工程]