| Atmospheric volatile organic compounds (VOCs) play an important role in atmospheric chemistry, at the same time, it is an important precursor for the formation of photochemical smog, it is one of the important precursors of PM2.5, have a significant impact to the formation of secondary organic pollution, atmospheric oxidation capacity, human health and other aspects. With the acceleration of urbanization in China, Urban ambient air concentrations of VOCs increased significantly, composed of more complex, it’s composition and spatial and temporal distribution of more and more people’s attention. Atmospheric volatile organic compounds (VOCs) prevention has become a serious challenge facing our country and the future. Therefore, the study of sources of pollution and characteristics analytical of atmosphere of volatile organic compounds (VOCs) have Significance and application value.In this paper, Jinan City as the study area, adopted in July 2010 ～ May 2013 in downtown Jinan,56 kinds of VOCs continuous monitoring data, studied Jinan atmospheric volatile organic compounds (VOCs) in the level of contamination and pollution. Combined Springs Plaza synchronous acquisition of O3, PM2.5 monitoring data and other air pollutants discussed Jinan atmospheric volatile organic compounds (VOCs) factors, calculated Jinan VOCs volatile organic compounds in the atmosphere ozone formation potential. PMF model was adopted Jinan source apportionment of atmospheric VOCs volatile organic compounds. VOCs emission sources in key industries combined surveillance data, analysis of the industrial sources of Jinan atmosphere of volatile organic compounds VOCs. Accordingly proposed Jinan air pollution control strategies VOCs volatile organic compounds. The main conclusions are as follows:(1)Jinan downtown main species of VOCs in ambient air is C2-C5 alkanes, ethylene, propylene, cis-2-butene, benzene, toluene and m-/p-xylene. Select one of ethane (Ethane), propane (Propane), isobutane (Iso-butane),butane (n-butane), cyclopentane (Cyclopentane), isopentane (Isopentane), ethylene (Ethylene), propylene(Propylene),cis-2-butene(Cis-2-butene),benzene(Benzene),toluene,(methylbenzene),m-/p-xylene( M-/p-xylene),o-xylene,(O-xylene),cyclohexane(Cyclohexane) the 14 highest ranking this VOC content of this paper as the target compound. In 2010 to 2013 in these four years, the total content TVOCs and target compounds showed a slow decline in the overall trend.(2)In terms of TVOCs seasonal, in 2011, the concentration change trend is spring< winter< autumn< spring; In 2012, the concentration change trend is autumn< winter< spring< summer. Concentration peak appeared in every day at around 10 a.m. with the concentration of 35 μg/m3.Minimum appear every day from 14p.m. to 17p.m., when the concentration is 6μg/m3. In the morning from 6a.m. to 10a.m., TVOCs hours when the concentration increased, the range is 18μg/m3-35μg/m3. To 12p.m. to 17p.m., TVOCs concentration decreased gradually, gradually stabilized, range is 6ug/m3-8μg/m3,.From 21p.m. to 5a.m. in the morning, when the concentration of TVOCs remain stable, range is 9μg/m3-19g/m3.Ethane, propane and PMio and PM2.5 has certain positive correlation.O3 content and the content of ethane, propane, ethylene, isobutane presents certain negative correlatione variation in content of propylene and present a certain positive correlation. First target compounds ethane, ethylene, propylene, propane, isobutane and the correlation of PM2.5 is one of the biggest isobutane, Secondly, in turn, is the propane, ethane, ethylene and propylene. TVOCs and PM2.5 satisfy equation are y=0.8645x+48.013, R=0.5890 and y=1.6429x+43.114, R=0.6042Thus may safely draw the conclusion that the concentration of TVOCs has certain correlation with PM2.5, TVOCs is affected by PM2.5.(3)In 2010-2013 contribution to the larger seven VOCs SOA is Toluene、M/p-xylene、O-xylene、Ethyl benzene、O-B-toluene、Inter-two ethyl-benzene、1,3,5- three methyl benzene.Its contribution rate of 27.94%, 10.89%,10.72%,7.67%,10.72%,4.07% and 3.78%, respectively.During the period of 2010 to2013,-the largest contribution to the OFP VOCs is Ethylene, cis-2-Butene, methylbenzene, Anti-2-Butene. The average contribution rate was 15.43%,6.30%,5.85%,5.94%.In the year of 2010 and 2011.The largest contribution came from M/p-xylene,1,2,4-Trimethylbenzene, O-xylene. Their contributions are 8.36%,4.92%,5.72%. In the nyear of 201 land 2012 the greast contribution came from cis-2-Butene, and 1,3,5-three methyl benzene, Its contribution was 4.32% and 4.10%.(4)The results of PMF source apportionment environmental air pollution data from 2012 July to shows that Combustion ratio is 21.51%, motor vehicle exhaust emission is 37.87%, organic reagents volatile source ratio is 20.18%, the industry source ratio is 20.54%. The motor vehicle exhaust emission source is the biggest source of pollution in the contribution of pollutants.The HYSPLIT-4 model results show that, the content of VOCs in ambient air in Ji’nan was also affected by other parts of the air, should strengthen regional joint prevention and control measures. |
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