香港大气中有毒挥发性有机物研究

用吸附／热脱除－ＧＣ＝／ＭＳ方法研究了香港不同功能区大气中挥发笥有机物的组成。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。

HAZARDOUS VOLATILE ORGANIC COMPOUNDS IN AMBIENT AIR IN HONG KONG

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.