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北京城区大气PM2.5主要化学组分及污染特征

张大伟 王小菊 刘保献 陈 添 石爱军 周健楠 刘兆莹

张大伟, 王小菊, 刘保献, 陈 添, 石爱军, 周健楠, 刘兆莹. 北京城区大气PM2.5主要化学组分及污染特征[J]. 环境科学研究, 2015, 28(8): 1186-1192.
引用本文: 张大伟, 王小菊, 刘保献, 陈 添, 石爱军, 周健楠, 刘兆莹. 北京城区大气PM2.5主要化学组分及污染特征[J]. 环境科学研究, 2015, 28(8): 1186-1192.
ZHANG Dawei, WANG Xiaoju, LIU Baoxian, CHEN Tian, SHI Aijun, ZHOU Jiannan, LIU Zhaoying. Characteristics of PM2.5 and Its Chemical Composition in the Urban Area of Beijing[J]. Research of Environmental Sciences, 2015, 28(8): 1186-1192.
Citation: ZHANG Dawei, WANG Xiaoju, LIU Baoxian, CHEN Tian, SHI Aijun, ZHOU Jiannan, LIU Zhaoying. Characteristics of PM2.5 and Its Chemical Composition in the Urban Area of Beijing[J]. Research of Environmental Sciences, 2015, 28(8): 1186-1192.

北京城区大气PM2.5主要化学组分及污染特征

基金项目: 北京市科技计划项目(Z121100000312035)

Characteristics of PM2.5 and Its Chemical Composition in the Urban Area of Beijing

  • 摘要: 为了解北京城区大气PM2.5主要化学组成特征,于2012年8月─2013年7月对城区石景山、东四和通州3个采样点及城区对照点定陵和区域传输点榆垡开展为期1 a的PM2.5组分研究,共获得268组样品. 结果表明:城区平均质量浓度大于1.0 μg/m3的组分有OC、NO3-、SO42-、NH4+、EC、 Cl-、Si、Ca、Al、 K+,其中ρ(OC)、ρ(NO3-)、ρ(SO42-)、ρ(NH4+)分别为(22.2±17.1)、(21.5±25.9)、(19.8±23.7)、(14.3±16.8)μg/m3,分别占ρ(PM2.5)的17.9%、17.3%、15.9%、11.5%,城区各主要组分的平均质量浓度明显大于对照点; 城区各采样点之间主要组分所占比例相差不大,与城区对照点、区域传输点差异明显; 春、夏、秋、冬四季城区采样点的主要组分均为OC、NO3-、SO42-、NH4+,这4种组分质量浓度之和分别占各季ρ(PM2.5)的62.5%、54.2%、46.0%、62.7%,其中春季ρ(NO3-)、夏季ρ(SO42-)、秋冬季的ρ(OC)相对较高;北京城区各采样点均受SOC影响较大,OC/EC〔ρ(OC)/ρ(EC)〕的平均值为5.7,城区SNA(二次无机气溶胶)占ρ(PM2.5)的比例(15.0%~53.1%)和NO3-/SO42-〔ρ(NO3-)/ρ(SO42-)〕(0.47~1.36)均随空气质量指数上升而增加,同时观测期间北京城区PM2.5中NO3-/SO42-的平均值为1.14,较往年明显增大,表明目前北京城区的PM2.5排放源逐步由以固定源为主向固定源和移动源并重的方向发展.

     

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  • 刊出日期:  2015-08-25

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