Yang Chi-Ru, Lin Ta-Chang, Chang Feng-Hsiang
Department of Environmental Engineering National Cheng Kung University, 1, University Road, Tainan 70101, Taiwan.
Environ Pollut. 2007 Jan;145(2):606-15. doi: 10.1016/j.envpol.2005.10.036. Epub 2006 Oct 2.
The particle size distribution and the concentrations of polycyclic aromatic hydrocarbons (PAHs) in incense smoke were studied using a custom-designed combustion chamber. Among the nine types of incense investigated, the particle and the total PAH emission factors varied significantly. The average mass median aerodynamic diameter (MMAD) of the smoke aerosol was 262+/-49nm, which positively correlated to particle emission factor (mg/stick, p<0.05). Coagulation was a major mechanism that dictates the MMAD of the smoke. The total toxic equivalency (the sum of the benzo[a]pyrene equivalent concentration) of the solid-phase PAHs (S-PAHs) was over 40 times higher than that of the corresponding gas-phase PAHs, indicating that the S-PAHs in incense smoke may pose potential health risk. Experiments show that each lowered percentage of total carbon content in the raw incense helped decrease the particle emission factor by 2.6mg/g-incense, and the reduction of S-PAH emission factor ranged from 8.7 to 26% when the carbon content was lowered from 45 to 40%.
使用定制设计的燃烧室研究了香烟雾中多环芳烃（PAHs）的粒径分布和浓度。在所研究的九种香中，颗粒物和总PAH排放因子差异显著。烟雾气溶胶的平均质量中值空气动力学直径（MMAD）为262±49nm，与颗粒物排放因子（mg/支）呈正相关（p<0.05）。凝聚是决定烟雾MMAD的主要机制。固相PAHs（S-PAHs）的总毒性当量（苯并[a]芘当量浓度之和）比相应气相PAHs高40倍以上，表明香烟雾中的S-PAHs可能构成潜在健康风险。实验表明，原香中总碳含量每降低一个百分点，颗粒物排放因子可降低2.6mg/g香，当碳含量从45%降至40%时，S-PAH排放因子的降低幅度为8.7%至26%。
