铅的生物富集效应

铅以微量元素的含量水平，广泛分布于动、植物的人体中。对比大量的动植物种群及各种年龄组的人群，似乎铅在一定的分子组态，特别是生物有机铅，不一定都是有害物质。相反可起一定的新陈代谢调节作用。或者可称为新陈代谢调节剂。特别是在动物、植物、人体中铅为微量、超微量状态时，铅更显现调节作用。

The Accumulative Effect of the Lead in Biololgical Body

The lead often exists as a form of trace or ultrace element in the biological body. On condition that the lead is more than normalizer in environment, it is a poisonous element. But lead is also a regulative objective.