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1989年10月27日西德有关专家聚会,讨论天然药物受卤代烃和重金属污染的情况。卤代烃诸如滴滴涕同分异构体、六氯苯、狄氏剂等等,用作杀虫剂。它们通过土壤、空气和水进入食物链。西德一切植物油均含有40％的杀虫药残留物,其中四种甚至超过最高允许含量。卤代烃由茨烯氯化而产生,是各种氯化物的混合物。它们是挥发性化合物,广泛分布在土壤里,通过沉淀而流入大海,富集在鱼体内。例如,在瑞典鲱鱼油中含
On October 27, 1989, experts from West Germany met to discuss the situation of natural medicines contaminated by halogenated hydrocarbons and heavy metals. Halohydrocarbons such as DDT isomers, hexachlorobenzene, dieldrin and the like are used as insecticides. They enter the food chain through soil, air and water. All vegetable oils in West Germany contain 40% of insecticide residues, and four of them even exceed the maximum allowable content. Halogenated hydrocarbons are produced by the chlorination of azincene and are mixtures of various chlorides. They are volatile compounds that are widely distributed in the soil and flow through the sediment into the sea and are concentrated in the fish. For example, in Swedish salmon oil