我国8种市售蚊香燃烧烟气中多环芳烃的排放特征

利用GC-MS对8种具有代表性的市售蚊香燃烧烟气中16种列入美国环境保护署(US EPA)优先控制的多环芳烃(PAHs)进行分析. 结果表明:有烟蚊香烟气中16种优先控制的PAHs均有检出(6号蚊香除外)，排放因子较大的化合物主要有萘、苊、二氢苊、菲和荧蒽；无烟蚊香烟气中仅检出10～11种，排放因子最大的化合物是菲，其次为萘；各种蚊香烟气中PAHs均以2～3环化合物为主，约占排放量的83.3%～98.0%. 同无烟蚊香相比，有烟蚊香烟气中PAHs的排放量较大，毒性也较高. 根据烟气中PAHs排放因子估算出一盘蚊香燃烧后烟气中苯并［a］芘排放量相当于燃烧4支香烟，PAHs排放量相当于燃烧8支香烟；蚊香燃烧后室内空气中ρ(PAHs)高达1 486.60 ng/m3，其中ρ(苯并［a］芘)为8.07 ng/m3，超过其《室内空气质量标准》(GB/T18883─2002)中的日均限值. 

Emission Characteristics of Polycyclic Aromatic Hydrocarbons in the Smoke from Eight Mosquito Coils in Chinese Market

The GC-MS technique was applied to analyze 16 US EPA-recommend priority-controlled polycyclic aromatic hydrocarbons (PAHs) from the smoke of eight mosquito coils in Chinese market. The results showed that all 16 priority-controlled PAHs were detected in the smoke of all smoking mosquito coils with the exception of coil No.6. The emissions were characterized by the predominance of Nap, AcPy, AcP, Phe and FluA. Only 10-11 PAHs were detected in the smoke from smokeless mosquito coils, with the main contributors including Phe and NaP. Among all the coils, the concentration distribution of PAHs was dominated by 2-ringed and 3-ringed PAHs, accounting for about 83.3%-98.0%. It can be seen that the amount of total PAHs emission and total toxic equivalent of PAHs in the smoke from smoking mosquito coils is much higher than that from smokeless mosquito coils. Based on emission factors in the smoke, burning one mosquito coil would release the same amount of BaP as burning 4 cigarettes, and the total amount of PAHs emission from burning one mosquito coil would be as high as that released from burning 8 cigarettes. Indoor air PAHs concentrations after burning a mosquito coil are about 1，486.60 ng/m~3, and the concentration of BaP is 8.07 ng/m~3, exceeding the daily average concentration of BaP specified in the indoor air quality standard in China.