【摘要】 用吸附/热脱附-GC/MS方法研究了香港不同功能区大气中挥发性有机物的组成.分析结果表明,香港大气中存在60多种VOCs,其主要成分是苯系物、烷烃和卤代烃.在检出物中有17种是有毒挥发性有机物,其主要成分是苯系物和氯代烃.其中氯仿、苯、甲苯、四氯乙烯、三氯乙烯和1,2-二氯乙烷是含量最高的组分.BTEX污染最严重的功能区是新界街道和香港岛街道,其次是工业区和商居区.氯代烃污染尤其是氯仿污染最严重的功能区是新界街道区、商居区和工业区,其次是香港岛街道 海洋公园大气中各种有害VOCs的含量最低.机动车尾气是香港大气中挥发性有机污染物的主要来源.氯代烃污染比较分散,它们与日常生活和工业生产过程中有机溶剂的挥发有关.更多还原

【Abstract】 The composition of volatile organic compounds in ambient air in different functional areas in Hong Kong has been researched with sorption/thermal desorption-GC/MS method. 60 or more VOCs were identified in, most of which were aromatics, alkanes and halohydrocarbons, and 17 sorts of which were hazardous. Chloroform, benzene, toluene, tetrachloroethylene, trichloroethylene and 1,2-dichloroethane were the VOCs whose contents were the highest among the hazardous VOCs. The pollution extent of BTEX decreased from streets to industrial and living areas. The contents of halohydrocarbons, especially of chloroform, were the highest in both streets and commercialiving areas, and industrial in New Territory. The contents of hazardous VOCs in ambient air in Ocean Park were the lowest. The results suggest that vehicle exhaust is probably the main source of VOCs in Hong Kong , and the halohydrocarbons may be discharged from industrial production processes and daily life.更多还原