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为了调查儿童体内尿铅含量的“建议限值”，作者于１９９５年９～１２月，选择银川市新市区、新城、老城区３～６岁学龄前儿童并选其父母均不从事铅作业者、居住地远离铅工矿区、在银川市居住３年以上的健康儿童为检测对象。随机抽样２８４人，其中男１５６人，女１２８人，采集空腹晨尿，用双硫腙法进行含铅量的测定。结果：男童ｘ为０．１５９μｍｏｌ／Ｌ，女童ｘ为０．１７１μｍｏｌ／Ｌ，经ｕ检验男女尿铅含量之间无显著性差异。故学龄前儿童铅含量可用同一“建议限值”来表示。经计算，３～６岁儿童尿铅ｘ为０．１６５μｍｏｌ／Ｌ，标准差为０．０７９６μｍｏｌ／Ｌ，故９５％的参考值上限为０．３７５μｍｏｌ／Ｌ。作者建议将尿铅含量０．３７５μｍｏｌ／Ｌ作为学龄前儿童尿铅水平的“建议限值”，并列入儿童正常体检指标。从而为进一步了解和控制铅污染、提高和保护儿童健康水平提供理论依据
In order to investigate the “recommended limit value” of urinary lead in children, the author chose Yinchuan’s new urban area, Xincheng District, and the old urban area from 3 to 6 years old to pre-school children and chose neither of their parents to engage in lead treatment from September to December 1995. Anyone who has lived in a lead-industrial mine area and has lived in Yinchuan for more than 3 years is a target of detection. A random sample of 284 people, including 156 males and 128 females, collected fasting morning urine and used the dithizone method for the determination of lead content. Results: The boy x was 0.159 μmol/L and the girl x was 0.171 μmol/L. There was no significant difference in urinary lead between men and women by u test. Therefore, the lead content of preschool children can be expressed by the same “recommended limit value”. The calculated urinary lead x in children aged 3 to 6 years was 0.165 μmol/L and the standard deviation was 0.0796 μmol/L, so the upper limit of the 95% reference value was 0.375 μmol/L. The authors recommend that the urinary lead content of 0.375μmol/L be used as a “recommended limit value” for urinary lead levels in preschool children and included in the normal physical examination indicators for children. This will provide a theoretical basis for further understanding and controlling lead pollution and improving and protecting children’s health