Liu Wen X, Dou Han, Wei Zhi C, Chang Biao, Qiu Wei X, Liu Yuan, Tao Shu
Laboratory for Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China.
Sci Total Environ. 2009 Feb 1;407(4):1436-46. doi: 10.1016/j.scitotenv.2008.10.055. Epub 2008 Nov 25.
Emission properties of polycyclic aromatic hydrocarbons (PAHs) from combustion of six residential coals in North China were investigated. The results indicated that, the total emission factors (EFs) for 15 PAH species in gaseous and particulate phases ranged from 52.8 to 1434.8 mg/kg with a decreasing sequence of local bituminous coals and anthracite coals, and honeycomb briquettes were largely dependent on the raw coals used to produce them. Particulate phase, dominated by median or high molecular weight components, made a major contribution (68.8%-76.5%) to the total EFs for bituminous coals, while gaseous phase with principal low molecular weight species accounted for most (86.3%-97.9%) of the total EFs for anthracite coals. The phase partitioning of PAH emission for honeycomb briquettes was similarly dependent on the crude coals. The total EFs, phase partitioning and component profiles of emitted PAHs were mainly influenced by the inner components of the studied coals. Burning mode and flue number on household coal-stoves also affected the emission characteristics by means of the oxygen supply. A sum of seven carcinogenic PAHs, benzo(a)pyrene(BaP)-equivalent carcinogenic power and total toxicity potency expressed in 2,3,7,8-tetrachlorodibenzo-dioxin(TCDD) toxic equivalence exhibited that bituminous coals and produced honeycomb briquettes had remarkably elevated values. Fluoranthene, benzo(b)fluoranthene, benzo(k)fluoranthene, chrysene and indeno(1,2,3-cd)pyrene from anthracite coals showed higher levels of BaP-based toxic equivalent factor, though the other toxicity indices were rather low for this type of coal.
对中国北方六种民用煤燃烧产生的多环芳烃（PAHs）排放特性进行了研究。结果表明，气态和颗粒相中15种PAH物种的总排放因子（EFs）范围为52.8至1434.8 mg/kg，其顺序为当地烟煤、无烟煤和蜂窝煤，且很大程度上取决于生产蜂窝煤所用的原煤。颗粒相以中或高分子量组分为主，对烟煤的总排放因子贡献较大（68.8%-76.5%），而以主要低分子量物种为主的气相占无烟煤总排放因子的大部分（86.3%-97.9%）。蜂窝煤PAH排放的相分配同样取决于原煤。所排放PAHs的总排放因子、相分配和组分特征主要受所研究煤的内部成分影响。家用煤炉的燃烧方式和烟道数量也通过供氧量影响排放特性。七种致癌PAHs的总和、苯并(a)芘（BaP）等效致癌能力以及以2,3,7,8-四氯二苯并二恶英（TCDD）毒性当量表示的总毒性强度表明，烟煤和生产的蜂窝煤的值显著升高。无烟煤中的荧蒽、苯并(b)荧蒽、苯并(k)荧蒽、芘和茚并(1,2,3-cd)芘显示出较高的基于BaP的毒性当量因子水平，尽管该类型煤的其他毒性指标相当低。
