The impact of building recirculation rates on secondary organic aerosols generated by indoor chemistry
The impact of building recirculation rates on secondary organic aerosols generated by indoor chemistry
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DOI：
10.1016/j.atmosenv.2006.05.087
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发表时间：
2007-08
影响因子：
5
通讯作者：
M. Zuraimi;C. Weschler;K. Tham;M. O. Fadeyi
中科院分区：
文献类型：
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作者：
M. Zuraimi;C. Weschler;K. Tham;M. O. Fadeyi
许多研究人员已经记录了室内环境中臭氧/萜烯反应导致空气中颗粒浓度增加的情况。本研究探讨了建筑再循环率对室内柠檬烯与臭氧反应产生的二次有机气溶胶 (SOA) 浓度的影响。实验在大型环境室中进行，使用四种再循环率（每小时 11、14、19 和 24 次换气 (ACH)）和恒定的室外空气交换率 (1 ACH) 以及柠檬烯和臭氧的恒定排放率。随着再循环率的增加，臭氧和SOA的沉积速度增加。由于生产率降低（由于臭氧减少）和表面去除率提高，不同尺寸范围内 SOA 的数量和质量浓度在较高的再循环率下显着下降。在较高再循环率下增强的凝结也降低了颗粒数量浓度，同时将尺寸分布转向较大颗粒。这些结果对健康的影响超出了暴露变化的范围，因为颗粒大小是决定颗粒沉积在呼吸道中位置的一个因素。
Numerous investigators have documented increases in the concentrations of airborne particles as a consequence of ozone/terpene reactions in indoor environments. This study examines the effect of building recirculation rates on the concentrations of secondary organic aerosol (SOA) resulting from reactions between indoor limonene and ozone. The experiments were conducted in a large environmental chamber using four recirculation rates (11, 14, 19 and 24 air change per hour (ACH)) and a constant outdoor air exchange rate (1 ACH) as well as constant emission rates for limonene and ozone. As the recirculation rates increased, the deposition velocities of ozone and SOA increased. As a consequence of reduced production rates (due to less ozone) and larger surface removal rates, number and mass concentrations of SOA in different size ranges decreased significantly at higher recirculation rates. Enhanced coagulation at higher recirculation rates also reduced particle number concentrations, while shifting size-distributions towards larger particles. The results have health implications beyond changes in exposures, since particle size is a factor that determines where a particle deposits in the respiratory tract.