Lead Exposure and Hearing Impairment Among Children / 环境与健康杂志

ABSTRACT

Objective To study the relationship between blood lead levels and hearing threshold changes among children. Methods The lead levels in whole blood of 62 children aged 5~7 years were determined by graphite furnance atomic absorption spectrophotometry.The levels of air mediated hearing threshold were determined by Madsen Model DB77 audiometer and headphone at frequencies of 250,500,1 000, 2 000,4 000 and 6 000 Hz. Results The average levels and range of blood lead were 181.97 ?g/L and 39.1~393.6 ?g/L respectively.The spearman correlation analysis revealed a significant positive correlation between the levels of hearing threshold and the blood lead levels with r =0.33~0.74 among childen( P