粒子数校正对空气微生物采样效果的影响

Effect of Particles Size Calibration on Air Microbe Sampling

用活性生物粒子校正式对１９８７～１９８８年在北京西单６级ＡＮＤＥＲＳＥＮ生物粒子采样器采集的大气细菌粒子数进行校正。结果表明，ＡＮＤＥＲＳＥＮ生物粒子采样器采样３ｍｉｎ，空气取样量８４．９Ｌ，采集的大气细菌粒子数平均为２５７个，校正后的大气细菌粒子数平均为３１５个，校正后的大气细菌粒子数明显高于校正前的大气细菌粒子数，ｔ＝２．０１２，Ｐ＜０．０５。ＡＮＤＥＲＳＥＮ生物粒子采样器第１级（＞８．２μｍ）采集的大气细菌粒子数平均为９８个，校正后的大气细菌粒子数平均为１３６个，校正后的大气细菌粒子数明显高于校正前的大气细菌粒子数，ｔ＝２．４０９，Ｐ＜０．０５；第２级（６．０～８．２μｍ）～第６级（＜０．６５μｍ）各级校正后的大气细菌粒子数与校正前的大气细菌粒子数没有明显差别，ｔ＝１．７０１～０．０２６，Ｐ值均＞０．０５。粒数校正对ＡＮＤＥＲＳＥＮ生物粒子采样器采集的大气细菌粒子的大小分布和大气细菌粒子浓度的日变化的影响不明显。

he airborne bacterial particles number sampled with 6 grades Andersen sampler at Xidan in Beijing from 1987 to 1988 was calibrated by the alive bioparticles calibration formula. The results showed that the average number of airborne bacterial particles sampled in 3 minutes and in 849L air was 257, but it is 315 when calibrated. The later was higher than the former (t=2012,P<005). The average number sampled with the 1st grade sampler (>82μ m) was 98, but it is 136 when calibrated, and the difference was obviously (t=2409,P<005).There was no obvious difference between the number sampled with the rest grades sampler (2nd～6th) and when calibrated (t=1701～0026,P>005). The effects of calibration on the particles size distribution and its concentration day's change were not obviously.