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北京市典型重污染过程中PM2.5载带水溶性无机离子污染特征分析
Characteristics of Water Soluble Inorganic Ions Carried in PM2.5 of Typical Heavy Haze Episodes in Beijing
投稿时间:2016-12-06  修订日期:2017-02-22
DOI:10.19316/j.issn.1002-6002.2018.03.04
中文关键词:  PM2.5  水溶性无机离子  重污染  SNA
英文关键词:PM2.5  water soluble inorganic ions  heavy pollution  SNA
基金项目:环境保护部2013公益项目"PM2.5/PM10自动监测的标准量值传递和QA/QC关键技术研究"(201309010)
作者单位
石梦双 天津师范大学城市与环境科学学院, 天津 300387
中国环境科学研究院, 环境基准与风险评估国家重点实验室, 北京 100012 
韩斌 中国环境科学研究院, 环境基准与风险评估国家重点实验室, 北京 100012 
杨文 中国环境科学研究院, 环境基准与风险评估国家重点实验室, 北京 100012 
张蕊 中国环境科学研究院, 环境基准与风险评估国家重点实验室, 北京 100012 
陈莉 天津师范大学城市与环境科学学院, 天津 300387 
白志鹏* 天津师范大学城市与环境科学学院, 天津 300387
中国环境科学研究院, 环境基准与风险评估国家重点实验室, 北京 100012 
通讯作者:白志鹏*  天津师范大学城市与环境科学学院, 天津 300387;中国环境科学研究院, 环境基准与风险评估国家重点实验室, 北京 100012  
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中文摘要:
      为研究北京地区冬季PM2.5载带的水溶性无机离子组分污染特征,2013年1月在中国环境科学研究院内采用在线离子色谱(URG-9000B,AIM-IC)对PM2.5中水溶性无机离子(SO42-、NO3-、Cl-、NH4+、Na+、K+、Mg2+、Ca2+)进行监测与分析。结果表明,采样期间总水溶性无机离子(TWSI)浓度为61.0 μg/m3,其中二次无机离子SO42-、NO3-、NH4+(SNA)占比达72.3%,在PM2.5中占比为40.29%,表明北京市PM2.5二次污染严重。重污染天[NO3-]/[SO42-]表明,固定源污染较移动源更为显著。三元相图表明,在空气质量为优的情况下,NH4+(在SNA中占比为30.3%~65.5%,下同)主要以NH4NO3的形式存在,较少比例以(NH42SO4存在;严重污染时,NH4+(47.3%~77.9%)主要以(NH42SO4形式存在,其次以NH4NO3的形式存在,其余的NH4+以NH4Cl的形式存在。[NO3-]/[SO42-]日变化表明,早、晚机动车高峰影响北京重污染发生。
英文摘要:
      To investigate the characteristics of water-soluble inorganic ions carried in PM2.5 in winter Beijing, during January 2013, the hourly mass concentration of PM2.5 and the water soluble inorganic ions (SO42-,NO3-,Cl-,NH4+,Na+,K+,Mg2+,Ca2+) were analyzed by online ion chromatography(URG-9000B,AIM-IC)in Chinese Research Academy of Environmental Sciences. The results showed that the total mass concentration of 8 water soluble inorganic ions was 61.01 g/m3. NO3-, NH4+, SO42- (SNA) accounted for 72.30% of all measured water soluble inorganic ions, and was up to 40.29% of PM2.5, indicating that PM2.5 secondary pollution was serious in Beijing. The mass ratio of[NO3-]/[SO42-] demonstrated that the fixed sources has greater impact on air pollution during heavy pollution days than mobile source. SNA triangular diagram showed that NH4+ in PM2.5 mostly coexisted in the form of NH4NO3 followed by (NH4)2SO4, when the air quality was good. However, in poor air condition, the aerosol was in the form of (NH4)2SO4 and NH4NO3 followed by NH4Cl, and the daily variation of[NO3-]/[SO42-] ratio indicated that morning and evening motor vehicle peak have impact on the happen of heavy haze in winter Beijing.
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