低水平铅暴露对儿童智力发育的影响是人们关注的一个热点。在我国根据近十年来 11省市的初步流行病学调查结果显示 ,铅中毒正严重威胁着广大儿童的身心健康[1] 。由于螯合剂与铅的结合是非特异性的 ,不仅会促进铅的排泄 ,而且也会引起锌和铜等人体必需微量元素的丢失 ,某些螯合 The impact of low levels of lead exposure on children’s intellectual development is a hot topic of concern. According to preliminary epidemiological survey results of 11 provinces and cities in our country in recent ten years, lead poisoning is seriously threatening the physical and mental health of the vast majority of children [1]. As the chelator and lead is non-specific binding, not only will promote the excretion of lead, but also lead to the loss of essential trace elements such as zinc and copper, some chelation