APEC期间天津及周边城市PM2．5中水溶离子特征

Variations of Water Soluble Ions in PM_(2.5) during the Asia-Pacific Economic Cooperation Summit in Tianjin and Surrounding Cities

为考察APEC会议期间颗粒物化学成分特征,在天津市与周边城市北京、石家庄、济南、保定5城市于2014年11月3日至20日同步手动采集PM2.5无机滤膜样品,对离子情况进行对比,结果表明:天津市PM2.5中无机离子组分平均质量浓度为65.4μg/m3,在京津冀城市中居首位,其中,NO-3、Cl-、Na+和K+浓度均为5城市最高。APEC会议之后,除Mg2+外,各项离子浓度均有不同程度上升。APEC会议期间硫氧化率(SOR)、氮氧化率(NOR)、NO-3/SO2-4和NO2/SO2比值均高于会议之后,说明APEC会议期间,离子二次反应较强且污染状况以流动源为主。APEC会议前后,一次离子相关性发生了显著的变化,建筑扬尘得到明显抑制。

To investigate the characteristics of watersoluble ions during the Asia- Pacific Economic Cooperation （ APEC ） Summit, a sampling work that under the direction of china national environmental monitoring center of PM2.5 in Tianjin Beijing Shijiazhuang Jinan and Baoding was made during 3 and 20 Oct 2014. The result showed that the average ion concentration of PM2.5 was 65.44p^g/m3, which was the highest. Moreover, the NO3 C1- Na~ and K~ were the also the highest. After the APEC Summit the concentration of all ions increased except Mg2~. the SOR NOR and the ratio of NO3/SO2-and NO2/SO2 were higher during the APEC Summit than after it which showed that secondary reaction were more active and mobile sources had considerably contribution to the aerosol. The correlation of primary ions had significantly changed during and after the APEC Summit indicating that building dusts were obviously controlled during the APEC Summit.