铅对机体的毒性是多方面的,就处于生长发育时期的儿童来说,其神经毒性最为重要。研究证明,当儿童血铅水平在10μg/dl(0.48μmol/L)以上时,即能对智能发育产生不可回逆的损害,而此时往往完全没有足以引起注意的临床表现。在大量基础和临床科学研究的基础上,1991年美国国家疾病控制中心(CDC)制订血铅水平超过或等于10μg/dl,不管是否有相应的临床症状、体征和其他血液生化改 Lead toxicity to the body is multifaceted, and in the period of growth and development of children, the most important neurotoxicity. Studies have shown that when the level of blood lead in children above 10μg / dl (0.48μmol / L) or more, can have irreversible damage to the intellectual development, but at this time there is often no enough attention enough clinical manifestations. Based on a large number of basic and clinical studies, the National Center for Disease Control (CDC) in 1991 established a blood lead level of 10 μg / dL or more, regardless of clinical signs, signs, and other biochemical changes