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2,3,7,8-四氯二苯-对-二噁英(TCDD)是已知毒性最大和致畸作用最强的合成化学物之一。它是由四氯代苯合成2,4,5-三氯苯酚时的付产品,因此在某些除莠剂(2,4,5-T等)、杀菌剂(六氯代苯)、杀霉菌剂(五氯苯酚)的合成中,都含有少量TCDD杂质和其他多氯二噁英。近来发现,在各种燃烧过程中,如城市的焚化炉、火力发电厂、内燃机、家用炉灶和吸烟等,都可形成各种多氯二噁英或多氯呋喃,并推测包括TCDD在内的多氯
2,3,7,8-Tetrachlorodibenzo-p-dioxin (TCDD) is one of the most toxic and teratogenic synthetic chemicals known. It is a by-product of the synthesis of 2,4,5-trichlorophenol from tetrachlorobenzene, so that in certain herbicides (2,4,5-T, etc.), bactericides (hexachlorobenzene) The fungicide (pentachlorophenol) synthesis contains small amounts of TCDD impurities and other polychlorinated dioxins. Recently, it has been found that various kinds of polychlorinated dioxins or polychlorofurans can be formed in various kinds of combustion processes, such as incinerators, thermal power plants, internal combustion engines, domestic stoves and smoking in urban areas, and speculated that TCDD Polychlorine