这是令人共同担忧的问题，但研究发现，大多数的广泛使用的补充剂含有很少或根本没有汞、二恶英和多氯联苯的物质。
The concern is a common one, but studies have found that most of the widely available supplements contain little or no mercury, dioxins or PCBs.
1998年3月，德国销售的牛奶中出现高浓度二恶英，追踪其来源，是巴西出口的动物饲料含有柑橘果泥球所致。
In March 1998, high levels of dioxins in milk sold in Germany were traced to citrus pulp pellets used as animal feed exported from Brazil.
生活垃圾中含有大量塑料制品、氯化物等，在垃圾不完全燃烧过程与其它物质化合生成二恶英。
MSW contains a large number of plastic products, chloride, etc., in the process of incomplete combustion of garbage and other substances combine to form dioxins.
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