弱智儿童与正常儿童微量元素比较分析

 为探讨锌、铁、铜、铅等微量元素（TE）水平与儿童智商（IQ）的关系，用原子吸收光谱法测定100名正常儿童和100名弱智儿童头发中锌、铅、铜、铁4种元素含量，同时进行血微量元素测定。结果显示，正常儿童头发中Zn含量显著高于智力发育不全儿童，正常儿童头发中Cu含量也明显高于智力发育不全儿童，Fe含量没有显著差异，而正常儿童头发中Pb含量则明显低于智力发育不全儿童。结论表明，微量元素缺乏或中毒影响儿童大脑发育和智力水平。

Comparative Analysis of Trace Elements in Mentally Retarded Children and Normal Children

Trace elements are essential for human growth. On the other hand, an excess of some elements can be toxic, leading to disturbances in human growth. Altered trace elements concentration influences the biological growth, leading to changes in the structure of macromolecules, the permeability of cell membranes etc. Mental retardation is one such disease, which can be congenital or acquired. This paper investigates the relationship between the contents of trace elements Zn, Pb, Cu, Fe and the intelligence quotient of the child. By means of atomic absorption spectrometry, the trace element contents in hair and blood of 100 normal and 100 mentally retarded children were determined. These children had no record of chronic or hereditary diseases and are of the age between 5 to 10 years. None of these children had any significant environmental or occupational exposure to metals. It is shown that the contents of Cu, Zn in the hair of normal children are significantly higher than those in mentally retarded children. The content of Fe sees no significant difference. However, the content of Pb in the hair of normal children is significantly lower than that in mentally retarded children. So, the lack of essential trace elements or the excess of toxic metallic elements will effect the development of children's brain and intelligence quotient.