冬季霾天气下武汉城区大气PM_(2.5)的化学特征  

Chemical Characteristics of PM_(2.5) under Winter Haze Days in Urban Wuhan

作　　者：周登 张帆[2] 吴涛涛 贺文煌 成海容[3] 王祖武[3] 吕效谱[3] 

机构地区：[1]湖北省咸宁市气象局,湖北咸宁437000 [2]贵州理工学院,贵阳550003 [3]武汉大学资源与环境科学学院环境工程系,武汉430079

出　　处：《湖北农业科学》2014年第21期5109-5111,5115,共4页Hubei Agricultural Sciences

基　　金：国家自然科学基金项目(41103061);国家"973"计划项目(2011CB707106);国家教育部博士点基金项目(20110141120015);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项目(OGL-201110)

摘　　要：研究了冬季霾天气下武汉城区大气PM2.5的化学组成和污染特征。结果表明,武汉冬季霾天气和正常天气PM2.5的平均浓度分别为183.83μg/m3和66.46μg/m3,主要成分OM、NO3-、SO42-、NH4+的总量分别占PM2.5的80.88%和65.43%。霾天气期间OC和EC有着共同的主要来源。与正常天气相比,武汉冬季霾天气下PM2.5中各物质的质量浓度均有所增加,二次有机气溶胶对武汉PM2.5有更为显著的贡献,以煤燃烧为代表的固定源对PM2.5的贡献更大。与其他城市相比,以机动车尾气为代表的移动源对武汉冬季PM2.5的贡献相对较大。霾天气下PM2.5浓度的增加可能与市政建设、煤燃烧、生物质燃烧、汽车尾气等因素有关。Chemical compositions and pollution characteristics of PM2.5 were studied under winter haze days in urban Wuhan.The results showed that the mean concentrations of PM25 were 183.83 μg,/m^3 on the haze days and 66.46 μg/m^3 on the normal days.OM,NO3^-,SO4^2-and NH4^＋ were the main components in PM2.5 accounted for 80.88% of PM2.5 on the haze days and 65.43% on the normal days.OC and EC was originated from the common emissions.Compared with that of the normal days,the mean concentration of each detected component in PM25 on the haze days was higher.Stationary sources represented by coal combustion and secondary organic aerosols of the haze days made significant contributions to the formation of PM2.5 than those of the normal days.In winter,moving sources represented by vehicle exhaust emissions in Wuhan contributed more to the PM2.5 than those in other cities.Under winter haze days,the increasing concentrations of PM2.5 were probably related with municipal construction,coal combustion,biomass burning and vehicle exhaust.

关 键 词：霾 PM2.5 水溶性离子 碳质组分 武汉 

分 类 号：X823[环境科学与工程—环境工程]