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重庆市主城区大气水溶性离子在线观测分析
Online Detection and Analysis of Atmospheric Water-Soluble Ions in Chongqing Urban Area
投稿时间:2017-03-10  修订日期:2017-07-20
DOI:10.19316/j.issn.1002-6002.2017.05.04
中文关键词:  PM2.5  水溶性离子  在线观测  污染特征
英文关键词:PM2.5  water soluble ions  online detection  pollution characteristics
基金项目:重庆市2014年度应用开发计划重点项目"重庆市主城区秋冬季节空气质量重污染过程追因技术研究"(cstc2014yykfa20005)。
作者单位
李礼 重庆市生态环境监测中心, 城市大气环境综合观测与污染防控重庆市重点实验室, 重庆 401147 
翟崇治 重庆市生态环境监测中心, 城市大气环境综合观测与污染防控重庆市重点实验室, 重庆 401147 
王军 重庆市生态环境监测中心, 城市大气环境综合观测与污染防控重庆市重点实验室, 重庆 401147 
许丽萍 重庆市生态环境监测中心, 城市大气环境综合观测与污染防控重庆市重点实验室, 重庆 401147 
刘芮伶 重庆市生态环境监测中心, 城市大气环境综合观测与污染防控重庆市重点实验室, 重庆 401147 
蒋昌潭 重庆市生态环境监测中心, 城市大气环境综合观测与污染防控重庆市重点实验室, 重庆 401147 
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中文摘要:
      2015年12月—2016年3月期间,利用在线气体与气溶胶成分监测仪(IGAC)在重庆市大气超级站开展连续观测分析,并捕捉到2次持续时间较长的空气重污染过程。对PM2.5中9种水溶性离子及5种气态前体物的观测结果分析表明:NO3-、NH4+和SO42-是重庆市主城区PM2.5中主要的水溶性离子成分,其浓度均表现出明显的日变化特征,主要以(NH42 SO4和NH4 NO3的形式存在。NH3和SO2是最主要的气态污染物。2次重污染过程的水溶性离子组分有明显差异,细颗粒物累积型污染的NH4+、SO42-、NO3-浓度高,二次转化十分明显;春节期间烟花爆竹集中燃放,Cl-、K+浓度高,主要属于一次排放;污染期间主要离子组分的同源性特征显著。
英文摘要:
      Continuous detection of water-soluble ions was conducted from Dec, 2015 to Mar, 2016, using online gas and aerosol monitoring chromatography at Chongqing atmospheric supersite, and two long-lasting heavy pollution processes were caught. Nigh kinds of water-solubleions and five kinds of gaseous pollutant in PM2.5 were monitored. Results showed that NO3-, NH4+ and SO42- were major water-soluble ions in Chongqing urban area, which demonstrated obvious daily variation characteristics, and existed in forms of ammonium sulfates and ammonium nitrates.Ammonia and sulfur dioxide were dominant gaseous pollutants. During two pollution processes, the ionic components varied apparently. The content of NH4+, SO42- and NO3- was high when pollution was caused by accumulated fine particulate matter and secondary conversion was clear.The content of Cl- and K+ from initial emission sources was high during spring festival due to burning of fireworks and crackers. Both pollution processes indicated that major detected water-soluble ions came from the same sources.
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