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重庆市北碚城区气溶胶中有机碳和元素碳的污染特征
摘要点击 345  全文点击 126  投稿时间:2017-11-21  修订日期:2018-01-21
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中文关键词  有机碳(OC)  元素碳(EC)  粒径  北碚  大气气溶胶
英文关键词  organic carbon(OC)  elemental carbon(EC)  particle size  Beibei  atmospheric aerosol
作者单位E-mail
彭小乐 西南大学资源环境学院, 三峡库区生态环境教育部重点实验室, 重庆 400715 1677165874@qq.com 
郝庆菊 西南大学资源环境学院, 三峡库区生态环境教育部重点实验室, 重庆 400715  
温天雪 中国科学院大气物理研究所大气边界层物理和大气化学国家重点实验室, 北京 100029  
吉东生 中国科学院大气物理研究所大气边界层物理和大气化学国家重点实验室, 北京 100029  
刘子锐 中国科学院大气物理研究所大气边界层物理和大气化学国家重点实验室, 北京 100029  
王跃思 中国科学院大气物理研究所大气边界层物理和大气化学国家重点实验室, 北京 100029  
陈建博 西南大学资源环境学院, 三峡库区生态环境教育部重点实验室, 重庆 400715  
江长胜 西南大学资源环境学院, 三峡库区生态环境教育部重点实验室, 重庆 400715 jiangcs@126.com 
中文摘要
      为了研究重庆市北碚城区大气碳质气溶胶组分的污染特征,于2014年3月~2015年2月采用安德森采样器采集大气颗粒物样品,用DRI Model 2001 A热光碳分析仪测定其中有机碳(OC)和元素碳(EC)的质量浓度.结果表明,北碚城区PM2.1和PM9.0中OC和EC的年平均浓度分别为(16.3±7.6)、(1.8±0.7)和(25.0±9.7)、(3.2±1.3)μg·m-3.在PM2.1中,OC和EC均呈现出冬春季大于夏秋季的季节变化特征,而PM9.0中OC呈现出夏春季大于冬秋季,EC呈现出冬春季大于夏秋季的季节变化特征.对全年OC和EC的粒径进行分析,发现OC在整个粒径上呈现"双峰型"分布,其中细粒子段峰值位于0.43~0.65 μm粒径段,粗粒子段峰值位于4.7~5.8 μm粒径段;EC呈现出"三峰型"分布,其中细粒子段峰值位于0.43~0.65 μm粒径段,粗粒子段峰值位于4.7~5.8 μm粒径段,同时2.1~3.3 μm粒径段也出现一个明显峰值.对OC和EC进行相关性分析并对PM2.1中的SOC进行估算,发现北碚城区全年SOC浓度为(6.3±5.9)μg·m-3,占全年OC的33.5%±22.6%,且OC和EC显著相关.最后对北碚城区大气气溶胶的污染来源进行分析,发现污染主要来源于汽油车尾气、生物质燃烧和燃煤排放.
英文摘要
      To study the pollution characteristics of atmospheric carbon aerosols, aerosol samples were collected via a cascade impactor (Andersen) from March 2014 to February 2015 in Beibei District, Chongqing. Organic carbon (OC) and element carbon (EC) were detected using a DRI 2001A carbon analyzer. The results showed that the annual average concentrations of OC and EC in PM2.1 were (16.3±7.6) and (1.8±0.7), respectively, and (25.0±9.6), and (3.2±1.3) μg·m-3, respectively, in PM9.0. The concentrations of both OC and EC were higher in winter and spring than in summer and autumn for PM2.1, whereas, for PM9.0, the concentration of OC was higher in summer and spring than in winter and autumn and that of EC was higher in winter and spring than in summer and autumn. The particle size distributions of OC and EC for the study year were analyzed, and it was found that those of OC were bimodal, with peaks in the size ranges of 0.43-0.65 μm for fine particles and 4.7-5.8 μm for coarse particles, and those of EC were trimodal, with peaks in the size ranges of 0.43-0.65 μm for fine particles and 4.7-5.8 μm for coarse particles and a concurrent significant peak in the particle size range of 2.1-3.3 μm. In addition, the correlations between OC and EC were analyzed and the SOC in PM2.1 was estimated. It was found that the average concentration of SOC was (6.3±5.9) μg·m-3, which accounted for 33.5%±22.6% of the OC concentration in Beibei District. Furthermore, OC and EC were significantly correlated. Finally, the pollution sources of atmospheric aerosols in Beibei were analyzed, and it was found that the pollution in Beibei mainly came from the exhaust gas of gasoline vehicles, biomass combustion, and coal combustion.

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