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.