武汉秋季灰霾和非灰霾天气细颗粒物PM_(2.5)中水溶性离子的特征  

Characteristics of Water-soluble Ions in PM_(2.5)During Haze and Non-haze Periods in Autumn in Wuhan

作　　者：张帆[1] 成海容[1] 王祖武[1] 吕效谱[1] 

机构地区：[1]武汉大学资源与环境科学学院,湖北武汉430072

出　　处：《中国粉体技术》2013年第5期31-33,共3页China Powder Science and Technology

基　　金：国家重点基础研究发展计划(973计划)项目;编号:2011CB707106;中国科学院广州地球化学研究所有机地球化学国家重点实验室开放基金;编号:OGL-201110

摘　　要：分析了武汉地区武大和天虹2个采样点秋季灰霾和非灰霾天气细颗粒物PM2.5中的9种水溶性离子(F-、Cl-、NO3-、SO42-、Na+、NH4+、K+、Mg2+、Ca2+)浓度。结果表明,NO3-、SO42-和NH4+是武汉秋季PM2.5中最重要的3种水溶性离子,且PM2.5中各水溶性离子之间组成比例相对稳定;灰霾期PM2.5中水溶性离子比例的增大是武汉秋季灰霾污染的重要特征,它们可能来源于生物质燃烧、土壤扬尘、化石燃料燃烧、汽车尾气排放等过程,其中天虹站点的大气二次污染比武大站点的严重,固定源对武汉2个站点秋季灰霾期大气中NOx与SO2相对贡献均比非灰霾期的大,移动源对天虹站点秋季大气中NOx与SO2的相对贡献则比武大站点的大。Nine water-soluble ions of PM2.5 including F-, Cl-, NO3-, SO42-,Na+, NH4+, K+, Mg2+ and Ca2+ were analyzed during haze and non-haze periods in autumn at Wuda station and Tianhong station in Wuhan City.The results show that NO3-, SO42- and NH4+are the most important ions in PM2.5 and the composition of the ions in PM2.5is relatively stable. The increase of the proportion of water-soluble ions in PM2.5 during the haze period is an important feature of the air pollution in autumn in Wuhan.They may be derived from the course of biomass burning, soil dust,combustion of fossil fuels, automobile exhaust emissions. The secondary air pollution in Tianhong station is more serious than that in Wuda station.The relative contribution of stationary sources to NOx and SO2 in Wuhan's atmosphere during the haze period is greater than that in the non-haze period. The relative contribution of mobile sources to NOx and SO2 in Tianhong station is greater than that in Wuda station.

关 键 词：灰霾 细颗粒物(PM2.5) 水溶性离子 

分 类 号：X823[环境科学与工程—环境工程]