天津市区PM_(2.5)中碳组分污染特征及来源分析  

Character and Source Analysis of Carbonaceous Aerosol in PM_(2.5) in the Center of Tianjin City

作　　者：董海燕[1] 古金霞[2] 陈魁[1] 姜伟[1] 白志鹏[3] 

机构地区：[1]天津市环境监测中心,天津300191 [2]天津城市建设学院,天津300384 [3]南开大学国家环境保护城市空气颗粒物污染防治重点实验室,天津300071

出　　处：《中国环境监测》2013年第1期34-38,共5页Environmental Monitoring in China

基　　金：天津市自然基金项目(11JCYBJC05200)

摘　　要：为研究天津市细颗粒中碳组分特征,于2006年8—12月连续采集PM2.5样品,分析其来源及浓度特征。结果表明,天津市区PM2.5、有机碳(OC)及元素碳(EC)浓度分别为165.90、23.90、5.50μg/m3,3项浓度均为冬季最高。OC、EC、总碳在PM2.5中所占比例分别为14.31%、3.66%和18.14%,秋季在PM2.5中所占比例最高,夏季最低。OC/EC平均值为4.21,按照秋、夏、冬呈递增的季节变化趋势。冬季二次有机碳污染较重,二次有机碳浓度(13.98μg/m3)占OC比例为34.5%。因子分析表明,非采暖期汽油车对碳气溶胶作用显著,采暖期生物质燃烧、燃煤及汽油车排放贡献。To investigate the characters of concentrations in PM2.5, a serial sampling work was made from Aug to Dec, 2006 in Tianjin. The result showed that： The average concentrations of PM2.5, organic carbon （OC） and element carbon （EC） were 165.90, 23.90, 5.50μg/m^3 ,respectively, both showed a high value in winter. OC, EC and TC （Total Carbon） took 14. 31% , 3.66% and 18.14% ,which was higher in winter and lower in summer. The average ratio of OC/EC is 4.21, at a order of autumn 〉 summer 〉 winter. Secondary organic carbon（SOC） concentration was 13.98 μg/m^3, accounting for 34. 5% of OC, suggesting that second reaction was more active in winter. Factor analysis on the eight carbon fraction indicated that gasoline engine exhaust was the major source for carbonaceous aerosol in non-heating period while coal combustion, biomass burning and gasoline engine exhaust were the major sources in heating period.

关 键 词：PM2 5 有机碳 元素碳 来源分析 

分 类 号：X823[环境科学与工程—环境工程]