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作者报告汕头市广沃开发区303名8岁～12岁小学生头发中Pb、Hg、Cd、Zn、AsS种微量元素的调查结果,资料分布全属正偏态。发铅中位数14.66μg/g,发汞中位数为0.7μg/g,发镉中位数为0.13μg/g,发锌中位数为152.5μg/g,发砷中位数为0.65μg/g.并以第95百位数为Pb、Hg、Cd和As的正常值上限,以第2.5和第97.5百分位数为发辞的正常值上下限。广沃区4个乡镇按照正常值界限计算超标率,结果以达濠超标率(5.76％)为高,统计处理差异有高度显著性(x~2=19.656,p<0.005)。
The authors report on the survey results of trace elements Pb, Hg, Cd, Zn and AsS in 303 hair pupils aged 8 to 12 in Guangwo Development Zone of Shantou City. All data are positive skewed. The median hair lead was 14.66 μg / g, the median hair mercury was 0.7 μg / g, the median hair cadmium was 0.13 μg / g, the median hair zinc was 152.5 μg / g and the median hair arsenic was 0.65 μg / g, and the upper limit of the normal range of the first 2.5 and 97.5 percentiles is the upper limit of the normal value of Pb, Hg, Cd and As at the 95th percentile. The four townships in Kwong Wo District calculated the excess rates according to the normal limits. The results showed that the exceeding standard rate was 5.76%, and the difference was statistically significant (x 2 = 19.656, p <0.005).