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重庆城区PM2.5化学组分特征及季节变化
Characteristics of chemical components of PM2.5 and its seasonal variations in Chongqing urban area
投稿时间:2017-03-09  修订日期:2017-07-16
DOI:10.12030/j.cjee.201703096
中文关键词:  PM2.5浓度  化学组成  特征
英文关键词:PM2.5 concentration  chemical components  characteristics
基金项目:重庆市科学技术委员会基础科研课题(2013cstc-jbky-01610)
作者单位
余家燕 重庆市生态环境监测中心, 重庆 401147 
王军 重庆市生态环境监测中心, 重庆 401147 
许丽萍 重庆市生态环境监测中心, 重庆 401147 
李礼 重庆市生态环境监测中心, 重庆 401147 
刘芮伶 重庆市生态环境监测中心, 重庆 401147 
刘佳 重庆市生态环境监测中心, 重庆 401147 
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中文摘要:
      2014年7月-2015年5月典型季节期间在重庆城区选择典型站点开展PM2.5样品采集,并测量质量浓度,分析样品中水溶性离子、无机元素、OC和EC等组分,在此基础上对组分化学组成进行了质量重构。结果表明:观测期间PM2.5年均值为76.4 μg·m-3,浓度季节变化为冬季 > 秋季 > 春季 > 夏季;组分方面,以二次转化为主的SO42-、NH4+、NO3-和OC是PM2.5组分中最主要成分,OC/EC比值4个季度均大于2,表明城区二次有机碳生成显著;硫氧化率(SOR)分析,气态污染物SO2的二次转化效率较高,大气存在明显的二次转化过程。PM2.5质量重构后主要组成为有机气溶胶(OM)、二次无机离子(SNA)和矿物尘,重庆城区应协同控制一次排放的颗粒物和气态污染物SO2和NOx,从而控制二次组分浓度。
英文摘要:
      A series of PM2.5 sampling was conducted from July 2014 to May 2015 at typicalsites in the urban areas of Chongqing. The mass concentrations of PM2.5 were measured, and water-soluble ions, elements, organic and elemental carbon (OC and EC) quantified. The measured PM2.5 mass was reconstructed based on SO42-, NO3-, NH4+, organic matter (OM), and EC. The average mass concentration of PM2.5 was 76.4 μg·m-3. The seasonal variation of PM2.5 mass followed an order:winter > autumn > spring > summer.Sulfate, ammonium, nitrate and organic carbon were the major specifications in PM2.5. The ratio of OC/EC was greater than two in four seasons during the sampling period, indicating that the formation of secondary organic carbon was significant annually. Sulfur oxidation ratio (SOR) analysis showed that the secondary conversion efficiency of sulfur dioxides was high. OM, SNA, and mineral dust were dominant compositions in PM2.5;the PM precursors, including sulfur dioxides and nitric oxides, should be controlled simultaneously, in order to control the secondary aerosol formation.
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