Analysis of Pollution Characteristics and Sources of VOCs in Autumn of Mushi Town,Tengzhou City
The concentration,component characteristics,photochemical effects and sources of VOCs in Mushi Town,Tengzhou City were analyzed and measured by using the online gas detection system in November 2019.The results indicated that:During the observation,the average volume fraction of TVOC was(32.75±28.96)×10-9,and the volume fractions of alkane,alkene,oxy gen-containing VOC,aromatics,halogenated hydrocarbons,acetylenes and sulfurous hydrocarbons ranked in descending order;the diurnal variation presented a"double-peak"pattern,with the peak appearing at 6:00-7:00 AM and 0:00-1:00 AM.The average ozone formation potential(OFP)of VOCs in the atmosphere was 102.02×100-9,the contribution rate of alkene to OFP of alkene was 69.5％.Ethylene,propylene,butylene,naphthalene and 1,3-butadiene ranked among the top in terms of ozone formation potential.Alkene consumed the most OH radicals,followed by aromatics,both of which accounting for 76.8％.The concentration of VOCs in SOA was 0.85 μg/m3.Aromatic contributed 92.8％to the total SOA generated,and naphthalene,toluene,benzene,m-xylene/p-xylene were the dominant substances that contributed the generation of SOA.The positive matrix factorization(PMF)model was used for source apportionment of VOCs,and the results indicated that vehicle emissions and volatile hydrocarbon contributed the most(32.5％)to VOCs,followed by solvents and volatile sources(30.9％),industry emissions(25.1％)and coal combustion(11.5％).
万方数据
维普
