Study On The Emission Of Polycyclic Aromatic Hydrocarbons And Related Pollution By Indoor Combustion Materials

The polycyclic aromatic hydrocarbons（PAHs）in indoor air mainly come from indoor combustion sources.At present,the research on the characteristic emisions of polycyclic aromatic hydrocarbons in PM_2.5.5 from the burning of incense,mosquito coils and cigarettes is rare,and related research lacks the health risks of PAHs generated by such combustion sources.Therefore,based on the simulated indoor environment,the solid phase(PM_2.5)PAHs produced by the combustion of four typical flavors,five typical mosquito coils,and five typical cigarette products in the domestic market were sampled,pretreated.and analyzed on GC-MS.The concentration of formaldehyde,CO₂,PM_2.5.5 and solid phase(PM_2.5)PAHs in the cabin was determined,and formaldehyde,CO₂,PM_2.5.5 and 16 EPA in the flue gas of different burning incense,mosquito coil and cigarette products were obtained.Based on the emission factor and the toxicological evaluation model,an asesment method for human toxicology by PAHs generated by combustion sources in indoor environment was established.The main conclusions were as follows:（1）The formaldehyde emission factor of incenses were 8.905¹3.082mg/（incense·g）.The formaldehyde emission factor of mosquito coils was 1.42⁵.59mg/（mosquito·g）.There was no significant difference in the characteristics of formaldehyde emission between smoked mosquito coils and smokeless mosquito coils.The formaldehyde emission factor of cigarettes were 7.455¹3.246mg/（cigarette·g）.（2）The CO₂ emission factor of burning incense was 624.706²003.574mg/g.The CO₂emission factor of mosquito coils was 858.471³736.039mg/g.The CO₂ emission factor of cigarette was 17737.58²722.409mg/g.（3）The three kinds of incense PM_2.5.5 emission factors were 22.592³1.217mg/g.The five kinds of mosquito coils PM_2.5.5 emission factor was 2.403¹1.622 mg/g.The five cigarettes PM_2.5.5 emission factor was 11.827¹9.931 mg/g.The concentration of particulate matter had no significant correlation with the price level of cigarettes,and cigarettes with high grades might still had high concentration of particulate matter.（4）The emission factors of three kinds of incense solid phase(PM_2.5)PAHs were distributed between 3.715 and 5.385 ng/g,and the distribution factors of four kinds of mosquito coils solid phase(PM_2.5)PAHs were distributed between 0.487 and 3.390 ng/g.The emission factor of the solid phase(PM_2.5)PAHs of the five cigarettes was distributed between2.511 and 9.215 ng/g.（5）The ratio of five-and four-ring solid phase(PM_2.5)PAHs produced by inscense to the total PAHs of the solid phase(PM_2.5)PAHs ranged from 68.26%to 73.85%.The proportion of five-rings was 14.54%²3.99%,and the proportion of six-rings was lower.The proportion of three-,four-,and five-ring solid phase(PM_2.5)PAHs in the total PAHs of mosquito-repellent products was 90.10%⁹3.24%.The two and six-ring PAHs were not the main part.The cigarette ring release solid phase(PM_2.5)PAHs in the two-ring PAHs ranged from 0.57%to2.40%.The proportion of three-rings was 17.16%⁸0.61,and the four-rings was13.64%⁵1.48%.The proportion of five-rings was 3.60%²4.42%,and the six-rings was1.57%⁴.70%.（6）For the incense,the proportion of Phe,Ant and Flu was relatively high,and the proportion of other PAHs was less than 10%.For mosquito coils,the proportion of Phe,Ant,Flu and Pyr was relatively high,and they were higher than 10%.The proportion of other PAHs was less than 10%.For cigarettes,Phe,Ant,Flu and Pyr were the main individual PAHs.（7）The characteristic ratio of the mosquito coil source and the cooking source was relatively close to BaP/BghiP,which could be used as a characteristic ratio for distinguishing.The characteristic ratio of the cigarette source was quite different from that of the coal source and the actual kitchen source.（8）For the incense,BaP carcinogenic equivalent dose（BEQ）was 9.849¹4.773ng/root.For mosquito coils,BEQ was 26.705³22.700ng/coil.For cigarettes,BEQ was12.855²4.864ng/branch.To cigarettes,the relatively high level of toxicity caused by relatively low grades.（9）For the scent,the ratio of MEQ of BaP in total MEQ was 50.69%⁵2.98%.For mosquito coils,the ratio of MEQ of BaP in total MEQ was 51.04%⁵1.62%.For cigarettes,the ratio of MEQ of BaP in total MEQ was 44.38%⁶7.44%.The research results in this paper can provide data reference and direction for relevant follow-up research.