火焰原子吸收光谱法测定l_2 一Kl浸出液中的微量金

Determination of trace gold in I_2-KI immersion fluid with flame atomic absorption spectrometry

本文采用SnCl_2将I_2还原成I^-,在5%的王水体系中用TBP萃淋树脂富集分离金,用 10%HCl溶液洗去杂质元素,以 0.lmol/L HCl—0.2mol硫脓混合溶液解脱金,火焰原子吸收法测定.方法精密度优于土 5%,回收率为 96～108%,方法检测下限为0.lmg·Au/L.

In this paper, the stannous chloride was used to reduce I2 to I . In a system of 5% aqua regia, gold was enriched and separated with tributylphosphate-containing resin, leached with 10% HC1 to remove impurities, deadsorbed with 0.1 mol/L HC1-0.2 mol/L thiourea and then determined by flame atomic absorption spectrometry. The precision of <±5% and recoveries of 96-108% by addition method are obtained. The detection limit is 0.1 mg Au/L.