大连市区大气气溶胶的无机化学特征分析

Analysis on inorganic compositions of aerosol in dalian urban

通过对大连市的两个采样点从 2 0 0 2年 4月至 1 2月三个期间的气溶胶的三种粒径的采样分析 ,结果表明 ,大连市区气溶胶中PM1 0 质量浓度约占TSP的 5 0 %,PM2 5质量浓度约占TSP的 30 %;8种可溶性离子在不同粒径气溶胶中所占的比例 ,随着粒径的减小而增大 ,冬季的SO42 - 、NO3- 、NH4+在各种粒子中含量高于夏季 ,沙尘暴期间各种可溶性离子在不同粒径颗粒物中的含量较低 ;1 1种常见元素在细粒子中的含量比粗粒子中的含量高 。

Three times measurements of atmospheric aerosol were conducted from April to December in three sizes in 2002. The result shows that the mass concentration of PM_(10) account for 50% of the TSP, while the mass concentration of PM_(2.5) is about 30% of the TSP. The proportion of 8 soluble ions in atmospheric aerosol varied with aerosol's sizes, the rate in fine particles was higher than that in coarse particles. The mass concentrations of SO_4^(2-),NO_3^-,NH_4^+ in winter were much higher that those in summer, moreover that is the lowest during the period of sand storm. The content of11 metal elements in fine particles were is higher than those in coarse particles. But the data in spring was higher that in winter.