Study On The Characteristics Of Particulate And Gas-solid Phase Polycyclic Aromatic Hydrocarbon From Cigarette Burning

Indoor cigarette burning not only affects indoor air quality but also has a serious impact on human health.And the particulate matter and PAHs produced by the burning of cigarettes can cause lung cancer,stomach cancer,skin cancer and other serious diseases.The previous research group studied the emission characteristics of PM_1.0,PM_2.5,and PM₁₀ and the emission characteristics of solid-phase PAHs released from cigarette burning,but did not systematically consider the effects of temperature,humidity,and combustion characteristics on the emission of particulate matter.The gas-phase PAHs produced by cigarette burning were studied.In view of this,this article first in the clean environment cabin with adjustable temperature and humidity for the three types of 6 kinds of cigarettes?tobacco type A,cigar type A,mixed type A,B,C,D?particulate matter PM_1.0,PM_2.5 and PM₁₀0 concentration changes were tested over time,and the emission characteristics of different cigarette particulates were determined.At the same time,the experimental temperature and humidity parameters were selected according to the indoor air quality standard GB/T18883-2002 to analyze the temperature,humidity,and tar content.Emitting characteristics.Then collect,pre-process and GC-MS the gas phase and particulate phase PAHs produced by the combustion of five cigarettes?tobacco type A,flue type B,cigar type A,mixed type D,E?in the experimental cabin simulating the indoor environment After the organic analysis,the emission characteristics of the PAHs produced by the combustion of cigarettes in the gas phase and particulate phase were determined,and the source analysis and exposure risk were analyzed.The main conclusions are as follows:?1?At a fixed temperature of 23?and a relative humidity of 40%,more than 98%of the particulates produced by the burning of three types of 6 cigarettes are fine particles PM_1.0,PM_1.0,PM_2.5 and PM₁₀ emission factors The rules are flue-cured tobacco type>mixed type>cigar type,and the emission factor range is 7.61¹6.54 mg/g.?2?Keep the humidity at 40%.As the temperature increases from 15?to 23?and35?,the mass concentration and emission characteristics of the particulates released by the mixed A cigarettes have no significant changes.Keeping the temperature at 23?unchanged,as the humidity increases from 40%to 55%and 70%,the emission factors and emissions of PM_1.0,PM_2.5 and PM₁₀ from flue-cured tobacco A,cigar A and mixed A cigarettes The rates are showing a downward trend.?3?The higher the tar content in cigarettes,the higher the mass concentration and emission factor of the emitted particulate matter,and the greater the impact on human health.?4?The emission factors of particulate phase and gas phase PAHs produced by the combustion of the five cigarettes are quite different,ranging from 3.109 to 8.86?g/g and110.61 to 221.09?g/g,respectively.3 Phenanthrene is the main individual in granular PAHs,accounting for 14.71%²1.72%.In addition to phenanthrene,4-ring fluoranthene,pyrene and beryllium also accounted for a higher proportion of the emission factors of the particulate phase PAHs.The main body of gas-phase PAHs is 2-ring naphthalene,accounting for 93%⁹5.71%.?5?The emission rate of particulate phase and gas phase PAHs produced by the combustion of 5 cigarettes is between 133.16⁴40.46?g/h·cigarette and 4770.32¹3816.3?g/h·cigarette.The 4 ring PAHs are the main part of the particulate phase PAHs,followed by the 3 ring and 5 ring PAHs,and the 2 ring and 6 ring PAHs account for a relatively small proportion of the particle phase PAHs.Among the gas-phase PAHs,the second ring PAHs accounted for the largest proportion,and the five ring and six ring PAHs were not detected in the gas phase PAHs.?6?Indeno?1,2,3-cd?pyrene,benzo?g,h,i?perylene,anthracene,fluoranthene produced by cigarette burning are more stable,so IP/?IP+BghiP?,Phe/Ant,Ant/?Ant+Phe?can be used to characterize the source of cigarette pollution,and BaA/Chry,Flu/?Flu+Pyr?can be used to distinguish the source of cigarettes and the source of incense.?7?The total BEQ of the particulate PAHs produced by cigarette combustion is much greater than the total BEQ of the gas phase PAHs produced by cigarette combustion.The BEQ of PAHs produced by cigarette combustion is mainly contributed by the BEQ of the particulate phase PAHs.The total MEQ of PAHs produced by cigarettes varies greatly,ranging from 249.52 to 448.82 ng.The MEQ of individual PAHs benzo[a]pyrene accounts for the largest proportion of total MEQ,ranging from 56.4%to 58.1%.?8?Based on the emission of PAHs produced by cigarette burning,the estimated concentration of PAHs released by a single cigarette burning in an indoor environment is between 253.576 and 569.157?g/m³.The BaP equivalent toxic concentration is high from the carcinogenic and distortional dose of BaP.The average daily limit concentration of BaP in the room is 2.73⁴.95 times of 1.0 ng/m³,and long-term exposure to the cigarette environment will cause serious harm to the human body.