空调滤网灰尘中多环芳烃分布特征及来源研究

利用气相色谱-质谱法对6台置于不同室内环境的空调滤网灰尘中16种优控多环芳烃(PAHs)进行分析测定.结果表明,6台置于不同室内环境的空调滤网灰尘中16种PAHs均可检出,且总浓度水平差异显著,∑PAHs为0.475~13.090μg/g,平均浓度4.345μg/g,其中餐馆∑PAHs的浓度最高;PAHs单体浓度也存在着较大的差异,其中苯并a]蒽(BaA)的含量最高,其次为 (Chr),苊(AcP)含量最低;6台置于不同室内环境的空调滤网灰尘中PAHs的环数分布特征较为相似,4环和5环PAHs占优势,平均比例分别为38.3%和28.3%;家居室ρ(BaA)/ρ(Chr)为0.680,餐馆中ρ(BaA)/ρ(Chr)为1.564,初步判定2类主要的PAHs污染源分别是烟草烟气的燃烧源和烹饪源;6台置于不同室内环境的空调滤网灰尘中PAHs毒性当量差异明显,其中苯并a]芘(BaP)的毒性当量平均占55.7%.

The distribution and possible source of polycyclic aromatic hydrocarbons in dust from six air conditioner filters

GC-MS technique was applied to determine 16 priority-controlled polycyclic aromatic hydrocarbons (PAHs) in dusts from air conditioner filters under six different indoor environments. 16 priority-controlled PAHs were detected in dusts from six air conditioner filters with a significant difference in concentration and with the highest PAHs concentration of 13.090μg/g in the restaurant. The average concentration of PAHs in dusts from six air conditioner filters is 4.345μg/g. There are also significant differences in the single PAH concentration with the highest concentration of BaA, followed by Chr, and the concentration of AcP is the lowest. The ring number distribution of PAHs is similar in the six air conditioner filters, dominated by 4- and 5-ring PAHs with the average percentage of 38.3% and 28.3% respectively. The ratio of mass concentration of BaA to Chr is 0.680 in the living room and 1.564 in the restaurant, from which it can be judged that the two main sources of PAHs are the smoke of tobacco combustion and cooking respectively. The TEQs of PAHs have an obvious difference, and the TEQ of BaP accounts for an average of 55.7%.