Pollution Characterization of Halohydrocarbon in Ambient Air of Tianjin
ZHAI Zengxiu1,2, LIU Yingchun3, ZOU Kehua1, WANG Gen1, YAN Fengyue1,2, LIU Yinghui1,2, WANG Jianzhuang1,2
1. State Key Laboratory on Odor Pollution Control, Tianjin Academy of Environmental Sciences, Tianjin 300191, China;2. Tianjin Sinodour Environmental Protection Science and Technology Development Co., Ltd, Tianjin 300191, China;3. Dagang Management Committee of Tianjin Binhai New Area, The Environmental Protection Work of the Office, Tianjin 300270, China
Abstract：To study the pollution characteristics of halohydrocarbons in Tianjin urban ambient air, 26 sampling points were selected to monitor the contents of the halohydrocarbon in summer with the Jixian Kowloon peak scenic area as the control point. The Agilent 7890A/5975C GS-MC spectrometer was used for the quantitative detection of 8 kinds of halohydrocarbon, with the detection rate for 5 kinds of halohydrocarbon greater than 50%, that is, dichloromethane, chlorobenzene, dichlorodifluoromethane, trichlorofluoromethane and chloromethane. This paper focuses on these five kinds of halogenated hydrocarbons and it is shown that the average concentrations of the five halohydrocarbons from high to low are: 6.75μg/m3(chlorometham), 5.43μg/m3(dichlorodifluomethane), 4.09μg/m3(dichloromethane), 2.95μg/m3(trichlorofluoromethane) and 0.46μg/m3(chlorobenzene). Among the six city areas and different function areas, the halohydrocarbon concentrations are generally high in the Nankai District and lower in the Hexi District. The methyl chloride and benzene concentrations in the functional areas are higher than in the control point, and the trichlorofluoromethanes concentration in the business area is significantly higher than in other functional areas.