室内环境烟草烟气中亚微米颗粒物迁移与烟碱释放规律OA

To investigate the physical diffusion characteristics and chemical properties of environmental tobacco smoke(ETS)in indoor environments.Schlieren imaging technology was employed to visualize the diffusion process of tobacco smoke.An Electric Low Pressure Impactor(ELPI)was used for real-time monitoring of particle number concentration and size distribution,while the nicotine content was quantitatively analyzed using comprehensive two-dimensional gas chromatography-mass spectrometry(GC×GC-MS).(1)In a confined indoor environment,the count median diameter of tobacco smoke particles ranged from 28.7 to 34.5 nm,and the particle size distribution exhibited a non-typical bimodal pattern.(2)Under the influence of thermal plumes,smoke particles showed a highly non-uniform spatial distribution.The indoor particle number concentration reached up to 6.6×105 particles/cm³,with a maximum concentration reduction of 77.27%observed between different locations.(3)The nicotine content in sidestream smoke accounted for more than half of the total nicotine released from a single cigarette.Areas at the same height as the smoke source were exposed to the most severe smoke pollution.Through multidimensional experimental approaches,the release and diffusion characteristics of indoor ETS were systematically revealed.The results identify sidestream smoke as a key target for second-hand smoke control and provide a scientific basis for exposure risk assessment of submicron particulate matter.