广州地区秋冬季细颗粒物PM_(2.5)化学组分分析

Analysis of Chemical Composition of PM_(2.5) in the Autumn and Winter in Guangzhou

分析了广州地区2009年—2010年秋冬季节大气中PM2.5样品的水溶性离子、重金属元素、有机碳/元素碳(OC/EC)、多环芳烃质量浓度和粒径分布。初步掌握了广州地区秋冬季节大气中PM2.5的化学组分和特点,有机质(OM)是广州地区秋冬季PM2.5中最主要的成分,其次是硫酸根离子、硝酸根离子和铵根;PM2.5中有机碳和元素碳的空间分布特征相似,并受一次源排放影响;PM2.5中的重金属含量以铝、锌、铅相对较高,且城区高于城郊;PM2.5中17种多环芳烃、苯并(a)芘(BaP)的浓度均为城郊高于市区。

Through examining water-soluble ions, heavy metal, OC/EC,polycyclic aromatic hydrocarbons concentration and particle size distribution of PM2.5 in Guanghzou, sampled in the autumn and winter from 2009 to 2010, this paper presents the chemical composition and characteristics of PM25 in the autumn and winter in Guangzhou. Followed by SO4^2- ,NO3^- and NH4^＋ ,organic matter（OM） was the main compoenent of PM2.5. OC and EC showed familar spatial distribution characters and both were affected by primary discharge. Aluminum, zinc and lead were the top 3 heavy metals in PM2.5 and urban showed higher comcentration than suburbw,while Bap exhibited the opposite.