大气微生物粒子与飘尘粒子的关系

RELATIONSHIP OF ATMOSPHERE MICROBIOLOGICAL PARTICES AND AEROSOL PARTICLES

用ＡＮＤＥＲＳＥＮ生物粒子采样器和光散射气溶胶粒子计数器，在北京西单对大气细菌、真菌和飘尘粒子的浓度、粒度分布及它们之间的关系进行了观测和研究。结果表明，大气细菌的粒度是负偏态分布，大气真菌是对数正态分布，飘尘是正偏态分布。大气细菌浓度与飘尘浓度的比值冬季大，为１１９５３８；夏季小，为２４２１７；年平均比值为６７５１７，＞２．０μｍ的菌尘比值为１５２５３８７，２．０μｍ～８．２μｍ的菌尘比值为３３１８，＞８．２μｍ的菌尘比值为３９４。大气真菌浓度与飘尘浓度的比值冬季大，为２１２７７０；夏季小，为６５５８５；年平均比值为１３５３４４，＜２．０μｍ的菌尘比值为９５２６９８，２．０μｍ～８．２μｍ的菌尘比值为５３４３，＞８．２μｍ的菌尘比值为２６３２。

The concentration and particle size distribution of atrmospherebacteria,fungi and aerosol particles at Xidan in Beijing are measured byAndersen biological particle samples and optical aerosol particel counter. Theresults show that the atmosphere bacterium particle size distribution belongsto a negative skewed distribution.It belongs to a normal distribution of fungiand a positive skewed distribution of aerosol particles.The concentration ratioof atmosphere bacteria to aerosol particles in winter is higher than that insummer.The annual average ratio is 67517.The ratio is 525376 to that part icleswhose size is less than 0.2 and the ratio is 3318 to the particles,whose size rangingis 2.0μm-8.2μm and the ratio is 394 to the particles,whose size is largerthan 8.2μm.The concentation ratio of atmosphere fungi to aerosol particles inwinter is higher than that in summer.The annual average ratio is 135344.Theratio is 952698 to the particles whose size is less than 0.2,μm,while the ratiois 5343 to the particles whose size ranging is 2. 0μm 8.2μm,and the ratio is2632 to the particles whose size is larger than 8.2μm.