镀金石英砂吸附大气中痕量汞的直接测定方法

Determination of Trace Mercury in Atmosphere Using Gold Coated Quartz Sand as Adsorbent

采用镀金石英砂来富集大气中的气态总汞,AMA(advanced m ercury analyzer)254测汞仪测定。结果表明,不同采样时间下的单级吸附管的吸附效率均在90%以上,采样40 m in时的相对标准偏差为5%左右。与巯基棉吸附及吸收液吸收方法的对比显示该方法具有吸收效果好、多次采样的精密度高、操作简便并且可以再生重复使用等优点。运用该法对上海徐家汇等几个地点的大气总汞进行了测定。

The gold-coated quartz sand was used as adsorbent to collect the atmospheric mercury. The result showed that the adsorption efficiencies of single-stage adsorption at different sampling times were all above 90%, and that the relative standard deviation was about 5% at a sampling duration of 40 min. Compared with the sulfhydryl cotton method and the HNO3 -K2Cr2O7 method, the present method is more efficient, reliable and easy to operate. The adsorbent could be used repeatedly after regeneration. The method has been used for the determination of atmospheric mercury in several areas of Shanghai.