痕量铊的液膜分离富集与测定

Determination of Trace Thallium After Liquid Membrane Separation and Enrichment

以正十六胺L113B 煤油为膜相,内相为0.040 mol/L的NaOH溶液;外相为0.040 mol/L的KCl和0.060 mol/L 的HCl溶液对痕量铊进行分离富集。实验结果表明, Tl(Ⅲ)的迁移率达99.5%以上。在合适的条件下, 可与其它离子分离。此法可用于黄铁矿样品中微量铊的分离富集,以火焰原子吸收光谱法测定,回收率在99%以上。本文还对Tl(Ⅲ)的液膜富集机理进行了讨论。

A method for FAAS determination of thallium after separation and enrichment through a liquid membrane consisted of membrane phase of hexadecylamine (RNH_(2)),L113B and kerosene, outer phase of 0.06 mol/L HCl and 0.04 mol/L KCl,and inner phase of 0.04 mol/L NaOH was developed. Experimental results showed that the transportation rate of Tl(Ⅲ) was above 99.5%. The method has been used to determine micro amount of thallium in pyrite and the recovery was over 99%. The transportation mechanism of the metal ions through the membrane has been discussed.