[Size distribution of particles collected by passive sampler].
Airborn particulate matters were sampled by two duplicate glass slides coated with thin layer of vaseline laid at the bottom of sampling cylinder of passive sampler for collecting both gaseous and particulate phase semi-volatile organic pollutant. Their size distribution was analyzed and found to be influenced by wind speed and coverage of the fine-screen-mesh (300 mesh) wrapping around the outside of sampling cylinder. In a windless (indoor) and semi-static windy conditions (sealed courtyard), diffusion of coarse particles (> 50 microm) was reduced effectively by covering sampling cylinder with the fine-screen-mesh, and accumulated size distribution curve of PM10 was similar with those collected by an active size-fractionated sampler (cascade impactor). In windy conditions (outdoor), coarse particles entered the sampling cylinder randomly, which is independent with wind speed, while the percentage of fine particulate with size of 3-5 microm decreased and those with size of 6-9 microm increased significantly.
Chu
Lei
L
College of Urban and Environmental Sciences, Peking University, Beijing 100871, China. truly1985@126.com
Liu
Jiu-meng
JM
Liu
Zhi-gang
ZG
Cao
Jun
J
Wang
Zan-hong
ZH
D000393:Air Pollutants / Q000032:analysis*; D002681:China; D004784:Environmental Monitoring / Q000379:methods*; D010316:Particle Size; D052638:Particulate Matter / Q000032:analysis*; D013048:Specimen Handling / Q000379:methods; D055549:Volatile Organic Compounds / Q000032:analysis
D000393:Air Pollutants; D052638:Particulate Matter; D055549:Volatile Organic Compounds