燃油式火化机排放烟气中二□英类污染水平和排放特征

对国内6台燃油式火化机排放烟气中的二□英类污染水平和排放特征进行了初步研究.结果表明:烟气样品中ρ(二□英类)为9.2～120.0 ng/m3〔273.15 K，101.325 kPa，φ(O₂)为11%换算值〕，毒性当量(TEQ)浓度为1.0～8.1 ng/m3；所有烟气样品中二□英类同类物分布相似，17种2,3,7,8-氯代二□英类同类物被全部检出，其中2,3,4,7,8-P₅CDF对毒性当量浓度的贡献最大；ρ(PCDFs)高于ρ(PCDDs)，ρ(T₄CDFs)在PCDFs中最高；燃烧控制和烟气处理措施是影响燃油式火化机二□英类生成和排放的重要因素. 

Concentrations and Congener Profiles of PCDDs/PCDFs in Flue Gas Samples from Oil Type Crematories

Concentrations and congener profiles of polychlorinated dibenzo-p-dioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs) in flue gas samples emitted from six oil type crematories in China were studied. Total concentrations of PCDDs/PCDFs in these samples ranged from 9.2 to 120.0 ng/m~3 (273.15 K, 101.325 kPa, at 11% O_2), while their TEQ values were 1.0 to 8.1 ng/m~3 with similar congener profiles. The 17 types of 2,3,7,8-substituted isomers were detected in all flue gas samples, while 2,3,4,7,8-P_5CDF was the most important contributor to total TEQ concentration. The sum of PCDFs was higher than that of PCDDs, and the concentration of T_4CDFs was the highest among PCDFs. Combustion conditions and air pollution control measures were considered to be the dominant factors for PCDDs/PCDFs formation and emission from crematories.