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铅在人体内的自然功能尚不清楚,然而,它在环境中的广泛分布,却使得人体不可避免地摄入少量的铅。通常,人们将血液中的含铅量,作为近期接触铅的合理的可靠指标。对成年人来讲,血铅水平高于～80μg/100ml时,即可能发生明显的铅中毒;对儿童,此阈值进一步降为～60μg/100m1。当然,这与每个人的体质及耐受性有关,某些儿童在血铅水平很低
The natural function of lead in the human body is unclear. However, its widespread distribution in the environment causes the human body to ingest a small amount of lead inevitably. Often, people use lead in blood as a reasonable and reliable indicator of recent exposure to lead. For adults, significant lead poisoning can occur with blood lead levels above ~ 80 μg / 100 ml; in children, the threshold is further reduced to ~ 60 μg / 100 ml. Of course, this is related to everyone’s constitution and tolerance, and some children have low blood lead levels