Department of Civil and Structural Engineering, Research Centre for Environmental Technology and Management, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, China.
J Hazard Mater. 2011 Sep 15;192(3):1787-94. doi: 10.1016/j.jhazmat.2011.07.014. Epub 2011 Jul 8.
The effect of air exchange rate (ACH), temperature (T), and relative humidity (RH) on the formation of indoor secondary organic aerosols (SOAs) through ozonolysis of biogenic organic compounds (BVOCs) emitted from floor cleaner was investigated in this study. The total particle count (with D(p) of 6-225 nm) was up to 1.2 × 10(3)#cm(-3) with ACH of 1.08 h(-1), and it became much more significant with ACH of 0.36 h(-1) (1.1 × 10(4)#cm(-3)). This suggests that a higher ventilation rate can effectively dilute indoor BVOCs, resulting in a less ultrafine particle formation. The total particle count increased when temperature changed from 15 to 23 °C but it decreased when the temperature further increased to 30 °C. It could be explained that high temperature restrained the condensation of formed semi-volatile compounds resulting in low yields of SOAs. When the RH was at 50% and 80%, SOA formation (1.1-1.2 × 10(4)#cm(-3)) was the more efficient compared with that at RH of 30% (5.9 × 10(3)#cm(-3)), suggesting higher RH facilitating the initial nucleation processes. Oxidation generated secondary carbonyl compounds were also quantified. Acetone was the most abundant carbonyl compound. The formation mechanisms of formaldehyde and acetone were proposed.
本研究考察了换气率（ACH）、温度（T）和相对湿度（RH）对地板清洁剂排放的生物源有机化合物（BVOC）经臭氧氧化生成室内二次有机气溶胶（SOA）的影响。总颗粒计数（D（p）为 6-225nm）在 ACH 为 1.08h（-1）时高达 1.2×10（3）#cm（-3），ACH 为 0.36h（-1）时更为显著（1.1×10（4）#cm（-3））。这表明较高的通风率可以有效地稀释室内 BVOCs，从而减少超细颗粒的形成。当温度从 15°C 升高到 23°C 时，总颗粒计数增加，但当温度进一步升高到 30°C 时，总颗粒计数降低。这可以解释为高温抑制了形成的半挥发性化合物的凝结，导致 SOA 的产率较低。当 RH 为 50%和 80%时，SOA 生成（1.1-1.2×10（4）#cm（-3））比 RH 为 30%（5.9×10（3）#cm（-3））时更有效，表明较高的 RH 有利于初始成核过程。还定量了氧化生成的二次羰基化合物。丙酮是最丰富的羰基化合物。提出了甲醛和丙酮的形成机制。
