【摘要】 <正> 微量元素是人体所必需的营养成份,对于正在生长发育的儿童尤为重要。头发是微量元素的排泄器官之一,又是一种代谢活动很低的蛋白质组织,其含量能反映机体较长时间内元素的积累状况及水平,采样方便、易于保存和运输,含量也较血清为高,是研究人体微量元素营养和人体代谢的良好途径。更多还原

【Abstract】 Five trace elements of hair of 310 healthy children in Tianjin (from 3 M.to 6 Y.of age) were determined quantatively by XRF method.The fixed normal levels(lowerlimit) of Ca,Fe,Cu,Zn are 260,70,10,and 7 ppm respectively and the normal level(upper limit) of Pb is 40ppm (0～2.9 Y.of age) and 25 ppm (3～6.9Y.of age).更多还原