香烟和蚊香超细微粒粒径谱特征

Dynamic characteristics of the size spectrum of ultrafine particles from cigarette and mosquito coil combustion

使用FMPS(Fast Mobility Particle Sizer)对香烟和蚊香燃烧产生的超细微粒数量粒径谱进行测量研究.结果发现,香烟烟雾ETS(Environmental Tobacco Smoke)和蚊香烟雾在10~500nm范围内呈对数正态单峰分布,香烟颗粒平均粒径(CMD)为118.7nm,蚊香颗粒CMD为80.3nm,两者数量粒径谱有类似的演变规律,但是总浓度衰减率有较大不同,香烟颗粒平均衰减率为0.066 1,蚊香颗粒平均衰减率为0.054 4.衰减率随着粒径的增大而减小,香烟颗粒各粒径段上颗粒的衰减率均大于蚊香颗粒.同时,在衰减的60min内香烟和蚊香颗粒CMD分别增大了近30%和25%.

The size spectra of ultrafine particles(5.6~560nm)number from burning cigarette and mosquito coils were measured with FMPS(Fast Mobility Particle Sizer).The results showed that the smoke particles of ETS(Environmental Tobacco Smoke)and mosquito coils within the size range of 10~500nm were lognormal distributed with one peak.The CMD(Count Median Diameter)of ETS and mosquito coil smoke particles were 118.7nm and 80.3nm,respectively.The number size spectra of ETS particles and the smoke of mosquito coils had similar evolution rules.But with different decay rates of total concertration,the average decay rates of ETS particles and mosquito coils were 0.066 1and 0.054 4.As particle size increased,the decay rates decreases.The decay rates of ETS particles are greater than those of the smoke of mosquito coils on each segment.Meanwhile,the CMD of ETS particles and mosquito coil smoke increased nearly 30% and 25% within 60min.