空气自动监测中PM2.5与PM10“倒挂”现象特征及原因

摘要

采用不同原理的自动监测仪器在不同季节同时测定PM2�5与PM10，对所得数据中的 PM2�5与PM10“倒挂”现象进行分析。结果表明，当PM10采用振荡天平法时，PM2�5与PM10的“倒挂”率较高；冬季和夏季“倒挂”现象发生率明显高于其他季节；造成PM2�5与PM10“倒挂”的原因主要有监测过程中的随机误差，PM2�5与PM10的监测方法原理不同，监测方法之间存在显著差异等。%Monitored PM using some different kinds of monitoring devices simultaneously in different seasons, analysised the revesal phenomenon between PM2�5 and PM10 , result showed that when use a tapered element oscillating microbalance( TEOM) device to monitor PM10 , could get more reverse data between PM2�5 and PM10 than using a beta attenuation monitor, in different seasons, the probability of reversal was higher in summer and winter. Analysed the monitoring principle and method about PM2�5 and PM10 ,and the structure of all kinds of monitoring instruments,we could come to the conclusion that the main reason cause the reversal between PM2�5 and PM10 , included that stochastic error, difference among all kinds of monitoring methods, and so on.