[Analysis of blood lead level of children living around lead-zinc mines].

Objective: To investigate the blood lead level of children living around lead-zinc mining areas, in order to analyze its distribution features of the population. Methods: In August 2016, three natural villiages around lead-zinc mines were selected randomly as survey sites, which were grouped A, B and C according to each distances from the center field, totally 1 379 children from the three villages were selected by cluster random sampling method as the investigation subjects, and their elbow peripheral vein blood samples were collected to determine the blood lead level by graphite furnace atomic absorption spectrometry. The distribution features of blood lead in different district, gender and age groups were compared and analyzed. Results: The median and quartile range of blood lead were 0.066 and 0.058 mg/L respectively. The blood lead levels of 341 children were esceeding 100 μg/L and that account for 24.73%. The median blood lead showed statistical significant differrnce among three groups ( P <0.01) , and the medians from high to low were: 0.075 mg/L (A) , 0.065 mg/L (B) and 0.059 mg/L (C) respectively. The average blood lead of male was higher than that of female ( P <0.01) . There was significant difference in blood lead levels among different aged groups ( P <0.01) , and the high blood lead rate dicreased with the increase of age ( P <0.01) . Results of multivariate logistic regression analysis showed that there was a high risk of excessive lead in the blood lead of boys aged 1-6 years from the center of the area. Conclusion: The blood lead level of children living around lead-zinc mining areas is relatively high. There are difference in district distribution, gender and age.