The Pollution Research Of PM_2.5 And VOCs In Atmosphere Of Hangzhou

With the quickening of economic development and urbanization process, the pollution problem of VOCs and PM₂.5 has already appeared in the city. Their component become more and more complicated and concentration rises by a large margin. Their law of distribution of space-time in the atmospheric environment is being paid close attention to by people. This experiment inspected the capability of sampling tube Carbotrap300 which are filled in multiplayer sorbent by desorption and GC/MS method, and researched the pollution of VOCs and PM₂.5 in indoor air and outdoor air of Hangzhou for a year.The results of Carbotrap300 showed that the linear correction coefficient were in the range of 0.994 to 1.000 for 3-choro-1-propen, chloroform, dicholoromethane, 1,1-dicholoroethane, 1,2-dicholoroethane, 1,1,1 -ticholoroethane, 1,1,2-ticholoroethane, 1,1,2,2-tetracholoroethane,trichloroet hylene,et al. when the injection mass into the sorbent tubes was between 5ng and 40ng. Within this range, the linear correction coefficient of benzene, toluene, o,m,p-xylene, 1,2,4-trimethyl -benzene,1,3,5-trimethyl-benzenee, pentane, octane, hexane, nonane and decane are 0.94-0.999. Except for benzene, hexane, nonane and heptane, the DVP pass ratio values are 77.8%-100%, the DP pass ratio valutes are 66.7%-100%, when sampled 29 other VOCs, which meet the demand for method TO-17 basically.The results of VOCs in outdoor air of Hangzhou showed that 334 exist in outdoors air, the average concentration of TVOCs is 233. 6μg/m3. Aromatic hydrocarbon, alkyl hydrocarbon, cycloparaffin and alkene are the most components, the percent of which are 19.5%, 24.8%, 13.7% and 13.4% in all compounds separatly. Otherwise, the oxygenous occupy higher percent, for example aldehyde, ketone and alcohol, ect. Which indicates the VOCs in Hangzhou come from automobile exhaust mostly. The sorts of VOCs in every sampling sit are similarity, but the number of each sort compound are different in different sampling site. Benzene series are inspected in every sampling site and the inspection rates are very high. Which indicates benzene series exist in outdoor air steadily and are able to reflect the pollution of VOCs. So we advise benzene series are inspect index in air quality.VOCs in indoor air of Hangzhou have been researched with the method. The results showed that 256 exist in indoors air. Which included aromatic hydrocarbon, alkyl hydrocarbon, cycloparaffin, chlorinated hydrocarbon, ester, alkene, aldehyde, terpene, ketone, diene hydrocarbon, oxygen hydrocarbon, ect. The concentration rang of TVOCs are 33.3-1190.2μg/m , average concentration is 285.5μg/m³.The total average concentration of aromatic hydrocarbon, alkyl hydrocarbon, chlorinated hydrocarbon, terpene and ketone reach 86.3%, which concentration...