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现代科学研究表明,在一些不明原因的学习困难、智力低下的儿童中有相当部分是由于血铅增高引起的。许多研究发现,铅污染环境越严重,儿童智力低下的发病率越高,儿童体内血铅水平每上升0.48微摩尔/升,其智商就要下降6分～8分。 铅是一种具有神经毒性的重金属元素,进入血液后,可引起机体代谢过程的障碍,对全身各组织器官都有损害,尤以神经系统的损害更为严重。儿童的神经系统正在快速发育,正是长脑子的时候,这个时期对铅具有特殊的易感性,轻微铅负荷
Modern scientific research shows that in a number of unexplained learning difficulties, a significant proportion of children with mental retardation are caused by an increase in blood lead. Many studies have found that the more serious the lead pollution is, the higher the prevalence of mental retardation in children. When the level of blood lead in children increases by 0.48 micromol / L, their IQ decreases by 6 to 8 points. Lead is a neurotoxic toxic heavy metals, into the blood, can cause obstacles to the body’s metabolic processes, the body’s tissues and organs are damaged, especially in the nervous system more serious damage. Children’s nervous system is rapidly developing, it is a long brain, this period of lead has a special susceptibility, a slight lead load