泡塑分离冷原子荧光测定金矿中微量汞

Determination of Mercury in Gold Ores by Cold-Atomic Fluorimetry after Foam Separation

冷蒸气原子荧光测Hg,Au的最大允许量为0.5μg。一些金矿样品中Au的含量较高,在分析中如不分离Au而直接测Hg,将产生严重负干扰。本文试验表明:在5％～15％的王水介质中,小于10μg量的Hg不被泡塑吸附;500μgAu被定量吸附,同时被吸附的有Sb、Tl等元素。Se、Te的干扰用K_2Cr_2O_7氧化消除。本法操作简便、快速,分离效果好,成功地应用于金矿样品中Hg的测定。

Mercury in the level of lower than 10 μg cannot be adsorbed by the foam from 5%~ 15% aqua regia. On the other hand, gold is adsorbed in the same condition. The interference by gold during the atomic fluorescence determination of Hg can be easily removed by this technique. The method has been applied to the analysis of gold ores for Hg content, and precise results were obtained.