Faculty of Civil and Environmental Engineering, Technion - Israel Institute of Technology, Haifa, Israel.
Environ Sci Technol. 2011 Jan 1;45(1):328-33. doi: 10.1021/es102060v. Epub 2010 Dec 8.
Tobacco smoking is well-known as a significant source of primary indoor air pollutants. However, only recently has thirdhand smoke (THS) been recognized as a contributor to indoor pollution due to the role of indoor surfaces. Here, the effects of relative humidity (<10% RH and ∼ 45% RH) and substrate (cellulose, cotton, and paper) on secondary organic aerosol (SOA) formation from nicotine-ozone-NO(x) reactions are discussed. SOA formation from the sorbed nicotine-ozone reaction ([O(3)] = 55 ppb) varied in size distribution and number, depending on RH and substrate type, indicating the role of substrate and water interactions in SOA formation. This led to SOA yields from cellulose sorbed nicotine-ozone reaction of ∼ 1 and 2% for wet and dry conditions, respectively. SOA formation from nicotine-NO(x) reactions was not distinguishable from background levels. Simultaneously, cellulose sorbed nicotine-ozone reaction kinetics ([O(3)] = 55 ppb) were obtained and revealed pseudofirst-order surface rate constants of k(1) = (1 ± 0. 5) × 10(-3) and k(1) < 10(-4) min(-1) under <10% and ∼ 45% RH, respectively. Given the toxicity of some of the identified products and that small particles may contribute to adverse health effects, the present study indicates that exposure to THS ozonation products may pose additional health risks.
吸烟是主要的室内空气污染物之一，这是众所周知的。然而，由于室内表面的作用，三手烟（THS）最近才被认为是室内污染的一个来源。在这里，讨论了相对湿度（<10%RH 和 ∼ 45%RH）和基底（纤维素、棉花和纸）对尼古丁-臭氧-NOx 反应生成二次有机气溶胶（SOA）的影响。根据 RH 和基底类型的不同，吸附尼古丁-臭氧反应（[O(3)] = 55 ppb）形成的 SOA 的大小分布和数量有所不同，这表明基底和水相互作用在 SOA 形成中起作用。这导致纤维素吸附尼古丁-臭氧反应的 SOA 产率在湿条件和干条件下分别约为 1%和 2%。尼古丁-NOx 反应生成的 SOA 与背景水平无法区分。同时，获得了纤维素吸附尼古丁-臭氧反应动力学（[O(3)] = 55 ppb），并揭示了在<10%和 ∼ 45%RH 下，k1 分别为（1 ± 0.5）×10-3 和 k1<10-4 min-1 的准一级表面速率常数。鉴于一些已识别产物的毒性以及小颗粒可能导致不良健康影响，本研究表明，接触 THS 臭氧化产物可能会带来额外的健康风险。
