Study On Pollution Characteristics Of Trace Volatile Organic Compounds In The Atmosphere Of Hefei

Volatile organic compounds(VOCs)are prone to volatile organic pollutants in the atmosphere,mainly include the alkanes,alkenes,aromatic hydrocarbons,halogenated hydrocarbon composition,etc.It has a great influence to the natural environment and human living environment which can generate secondary pollution of organic pollutants and aerosols,with strong photochemical reactivity In the atmosphere.Many domestic institutions have already begun to do a series of VOCs research on changes,sources and so on nearly.However,the limitis for the majority of VOCs concentrations have not yet been set in the domestic,and it is lack of theoretical analysis about the changing features and changing rules of VOCs in the environment,besides,it is little about the changing features of VOCs in haze days from now on.Therefore,This experiment start the research from the following launches,provides the theory basis for the changes of VOCs in Hefei,riched VOCs information database of Hefei,give some reference to the regulation of urban residents travel and pollutants.Select the campus transport area,transportation hub area,Forest Park area,tire industrial zone and automotive industrial zone as the conventional sampling points,we use SuMa tank to collect the samples on different locations,Nutech3550 atmospheric preconcentration device and GC/MS to analysis of the sample in different locations.Besides,we use SPSS to analysis of the homology and the sources of pollution.In the end,we study the diurnal variation and highly variation of VOCs in haze weather.The experimental results show: The main ingredients of VOCs in several typical areas are toluene,xylene,ethyl benzene,trimethylbenzene;The main ingredients of automobile exhaust is toluene,it has 57.90% of the total concentrations of VOCs;The concentration of VOCs in low temperature period is higher than it in high temperature period,it get a very high concentration in haze days,the concentration of VOCs in transportation hinge area is higher than that in campus traffic area;the concentration of VOCs in campus area in the night is higher than it in daytime,it get highest on 2:00,the concentration of toluene exceeded the target limit of European environmental quality standards;The ingredients of VOCs become complex in haze days,and that have a high concentration,the change fluctuation is less than it in no haze days,and in haze days,the concentration of VOCs in campus area in the night is higher than it indaytime;the concentration of VOCs is highest in the hight of 27 m,and in the hight of63 m,it become lowest.;The relevance of the main component of VOCs in the high temperature time is good in campus traffic area,and it is not good in transportation hinge area;and the relevance of the main component of VOCs in the high temperature time is good in transportation hinge area,and it is not good in campus traffic area;Motor vehicle exhaust is the main pollution sources on trunk road of Hefei.