天津市PM_(2.5)中水溶性无机离子污染特征及来源分析  

Pollution Character and Source of Water-Soluble Inorganic Ions in PM_(2.5) over Tianjin

作　　者：古金霞[1,2,3] 吴丽萍[2] 霍光耀[2] 白志鹏[4] 杜世勇[1] 刘爱霞[5] 解以扬[5] 

机构地区：[1]济南市环境保护科学研究所,山东济南250014 [2]天津城市建设学院基础学科部,天津300384 [3]南开大学环境科学与工程学院,天津300071 [4]中国环境科学研究院,北京100012 [5]天津市气象科学研究所,天津300074

出　　处：《中国环境监测》2013年第3期30-34,共5页Environmental Monitoring in China

基　　金：天津市应用基础及前沿技术研究计划(11JCYBJC05200)

摘　　要：2008年1、4、7月和10月在天津大气层边界站,利用中流量采样器对大气中的细粒子进行了滤膜样品采集,应用离子色谱检测技术分析了8种水溶性无机离子(Na+、NH4+、K+、Mg2+、Ca2+、SO24-、NO3-和Cl-)的含量。结果表明,天津市大气PM2.5中总水溶性无机离子平均浓度为47.3μg/m3,其中,SO24-、NO3-、NH4+和Cl-是最主要的水溶性无机离子,占总离子质量分数共计87.3%,表明了天津市细粒子中的主要水溶性无机离子的特征。[NH4+]/2[SO24-]平均比值接近1.0,显示硫酸氨是细粒子中硫酸盐的主要存在形式。NO3-/SO24-浓度比的平均值为0.65,反映了燃煤污染与机动车尾气污染并存的复合型大气污染特征。并通过对PM2.5中8个水溶性离子成分的主成分分析进一步揭示了其来源。PM2.5 samples were collected at the Atmospheric Boundary-layer Observation Station of Tianjin using middle-flow impact samplers.The sampling periods were January,April,July and October of 2008.Eight inorganic components（Na^＋、NH4^＋、K^＋、Mg^2＋、Ca^2＋、Cl^-、NO3^- and SO4^2-） of PM2.5 were determined to study the chemical characters of PM.SO4^2-,NO3^-,NH4^＋ and Cl-were dominated ionic components in PM2.5 and accounted for 87.3% of the total mass concentration.Pollution character of major water-soluble inorganic ions was indicated.The average ratio of NH4^＋/（2＊SO4^2-） was about 1.0,which indicated that most of SO4^2- in PM2.5 were likely to exist as（NH4）2S04.The mean mass ratio of NO3^-/SO4^2- was 0.65,which indicated that the complex pollution of coal combustion and vehicle exhaust were existent in Tianjin.Sources of major water-soluble inorganic ions were determined by the method of major component analysis of eight water-soluble inorganic ions in PM2.5.

关 键 词：PM2 5 水溶性无机离子 来源 

分 类 号：X831[环境科学与工程—环境工程]