运用FA-3型Anderson撞击式气溶胶粒度分布采样器采集南京北郊生活区大气中的可吸入颗粒物,用称重法测量大气中不同粒径可吸入颗粒物的质量浓度,同时用光学系统测量不同粒径上可吸入颗粒物的透过率,分析不同粒径大气气溶胶的透过率变化关系。结果表明:小于2.1 μm颗粒物所占比例达59.88%,表明大气中细粒子污染严重;可吸入颗粒物粒径越小,其透过率也越小;细颗粒物质量浓度与其透过率呈很高的负相关;粗颗粒物对可见光波长的选择性弱。

FA-3 impingement sampler is used for measuring aerosol particle size distribution to collect the information of the atmospheric particles of living quarters in the north of Nanjing. The content of atmospheric aerosol with different size is measured by the weight method. The transmittance of the particulate matter with different size is measured by using optical measurement system. The Results show that the proportion of the particles less than 2.1 μm is up to 59.88% and the particles with small size in the air are seriously polluted. The smaller the size of the particles, the lower is the transmittance. With the rising concentration of the fine particles, its transmittance decreases. The wavelength selectivity of the coarse particles is weak.