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环境经济与环境管理

Distribution of polycyclic aromatic hydrocarbons in smoke and ash from burning mosquito coils

基金项目：国家自然科学基金项目(No.50608040);江苏省科技支撑计划(工业)项目(No.BE20090165);教育部留学回国人员科研启动基金资助项目

摘要：对蚊香燃烧后的烟气和灰烬样品进行采集,利用GC-MS方法分析其中16种优控多环芳烃(PAHs)的含量,并对烟气和灰烬中各PAHs组分及总量间的相关关系进行探讨.结果表明:蚊香烟气中16种PAHs均有检出,排放量较大的组分主要有萘、苊、二氢苊、菲和荧蒽,并以2～3环PAHs为主;灰烬中PAHs也以2～3环化合物为主,但排放总量仅为烟气中的4.7%～21.8%.通过与其他室内燃烧源PAHs排放量的对比发现,蚊香灰烬中总PAHs排放量低于卫生香源和木柴源,但比香烟源高一个数量级以上;烟气中总PAHs排放量低于燃煤源、木柴源和卫生香源,但明显高于烹调源.回归分析结果表明,烟气中总PAHs排放量与灰烬中的排放量表现出明显的线性关系(R²=0.9054).

Abstract：GC-MS(gas chromatography coupled with mass spectrometry)was applied to analyze the concentrations of 16 priority-controlled polycyclic aromatic hydrocarbons(PAHs)recommended by the US EPAfrom the smoke and ash of burning mosquito coils.The correlation of each individual PAHand the total PAHs in the smoke and ash of mosquito coils is also discussed.The results show that all 16 priority-controlled PAHs are detected in the smoke of mosquito coils,characterized by the predominance of Nap,AcPy,AcP,Phe and FluA.The total PAHemission both in the smoke and ash is dominated by components with 2 to 3 rings,but the total PAHemission in the ash is only 4.7%～21.8% of that in the smoke.By comparison of PAHemission data between mosquito coil burning and other indoor sources,it can be concluded that the total PAHemissions in the ash from mosquito coil burning is lower than that from domestic incense burning and wood combustion but much higher than tobacco burning,and the total PAHemissions in the smoke from mosquito coil burning are lower than emissions from domestic coal combustion,wood combustion and incense burning but much higher than domestic cooking sources.Regression analysis shows a significant linear relationship of the total PAHemissions between the smoke and ash of mosquito coils(R²=0.9054).