石家庄市大气颗粒物中水溶性无机离子污染特征研究

用超声萃取－离子色谱法分析了石家庄市大气颗粒物中8种水溶性无机离子。结果表明，NO3－、SO2－4、NH4＋及 Ca2＋为主要组分；各个离子的质量浓度均有季节及空间变化差异；不同粒径颗粒物中 SO2－4和 NO3－相关性均很好，NH4＋与 SO2－4、NO3－在细颗粒物中具有良好的相关性，Ca2＋在粗粒子中与 NO3－和 SO2－4的相关性也较好。SO2－4／NO3－质量比季节变化表明，春、夏季固定源与流动源对大气颗粒物贡献相当，秋季流动源贡献较大，冬季固定源贡献较大。PM2．5中SO2与SO2－4、NO2与 NO3－转化率表明，SO2－4、NO3－主要是由二次转化而来。

Pollution Characteristic of Water Soluble Inorganic Ion in Atmospheric Particles in Shijiazhuang

Eight water soluble inorganic ions were analyzed by Ultrasonic Extraction-Ionic Chromatography in the atmospheric particles in Shijiazhuang.The main water soluble inorganic ions were NO3-,SO2 -4 ,NH4＋and Ca2 ＋.Each component concentration had seasonal and spacial variation.High linear correlation between SO2 -4 and NO3-in different diametric atmospheric particles.The linear correlation between NH4＋ and SO2 -4 ,NH4＋ and NO3-were well in fine particles.The linear correlation between Ca2 ＋and SO2 -4 ,Ca2 ＋and NO3- were well in coarse particles.The seasonal variation of SO2 -4 /NO3-showed that stationary sources and moving source had sim-ilar contribution to the atmospheric particles in spring and summer.The moving source contribution was greater in Autumn and the stationary source contribution was greater in Winter.The conversion rates between SO2 and SO2 -4 ,NO2 and NO3-showed that SO2 -4 and NO3-were mainly from secondary conversion.