北京市不同区域大气气溶胶粒子中水溶性离子的特征

在北京市两个区域同时采集不同粒径的气溶胶粒子，利用离子色谱分析了样品中的水溶性无机离子组分．研究发现，城乡结合带采集的总水溶性离子浓度比郊区高．两地水溶性离子浓度有明显的季节变化趋势，SO4^2-浓度冬季最高，而夏季许多离子浓度普遍较低，NO3^-质量中值直径随季节变化有明显的不同．Na^ 浓度受地表植被影响较大．两地NO3^-，SO4^2-，NH4^ ，K^ 四种离子间的相关系数很好，可能是因为这些离子的来源相似．

PROPERTY OF WATER-SOLUBLE IONIC OF AEROSOL PARTICLE IN DIFFERENT AREA IN BEIJING

Aerosol particles of different sizes were collected in two different areas in Beijing at the same time.We analyzed water soluble inorganic ions by using the ion chromatograph.It was found that the concentrations of total water soluble ions in town were higher than that in outskirt.And the concentrations of water soluble ion showed evident trend of seasonal variation.The concentration of SO 2- 4 reached the highest level in winter while many ionic concentrations were low at large in summer.Mass median diameter of NO - 3 varied significantly with the season.The concentration of Na was affected by vegetations in some degree.The correlation coefficient of NO - 3,SO 2- 4,NH 4 and K of two areas were good and may suggest the similar sources of these ions.