深圳市道路环境空气中PM_(2.5)水溶性离子污染特征

Characteristics of PM_(2.5)water-soluble ion pollution in the air of road environment in Shenzhen

利用深圳市深南中路路边自动空气监测站的水溶性离子色谱监测仪的观测数据,对PM_(2.5)中水溶性无机离子进行污染特征解析。结果表明,观测期间深南中路路边子站PM_(2.5)中主要水溶性无机离子的总平均浓度为7.73µg/m^(3),占PM_(2.5)平均浓度的39.8%,是PM_(2.5)的重要组成。其中二次离子SO_(4)^(2-)、NO_(3)^(-)和NH^(4+)的平均浓度分别为3.03µg/m^(3)、1.97µg/m^(3)和1.53µg/m^(3),占总离子平均浓度的84.5%,是最主要的水溶性离子。通过观测,分析了此站点发生的多次水溶性离子污染过程的成因、水溶性离子的的日变化特征及影响NH_(4)NO_(3)气粒分配的关键环境因素。

The pollution characteristics of water-soluble inorganic ions in PM_(2.5)were analyzed by the observation data of water-soluble ion chromatography monitor at Roadside Automatic Air Monitoring Station,Shennan Middle Road,Shenzhen.The results showed that the total average concentration of that ions was 7.73µg/m^(3),accounting for 39.8%of the average concentration of PM_(2.5),revealing the highest concentration in PM_(2.5).The secondary ions SO_(4)^(2-)NO^(3)^(-)(and NH^(4+),with average concentrations of 3.03µg/m^(3)、1.97µg/m^(3) and 1.53µg/m^(3),accounting for 84.5%of the to⁃tal average concentration of the water-soluble ions,having its greatest abundance in those ions.Through observation,the frequent occurrence of water-soluble ions pollution was analyzed in its causes,the diur⁃nal variation of the ions and the key factors of NH_(4)NO_(3) particles distribution.