ICP–MS法测定铅精矿、锌精矿、混合铅锌矿中的铊

建立铅精矿、锌精矿、混合铅锌矿中铊的分析方法。试样采用盐酸、硝酸、硫酸消解,挥发除去硫,沉淀除去大部分铅和硅,用电感耦合等离子质谱(ICP–MS)法测定样品溶液中铊的含量。对基体及主要杂质元素的干扰情况及消除方法进行试验,优化了分析方法。铊含量在0.01~10μg/L的范围内具有良好的线性关系,线性相关系数大于0.999 9,检出限为0.001 8μg/L。测定结果的相对标准偏差为1.42%~3.96%(n=11),加标回收率为92.7%~106.8%。该方法简单、快速、准确,可用于铅锌精矿、混合铅锌矿中铊的测定。

Determination of Thallium in Lead Concentrate,Zine Concentrate,Mixed Leas-Zine Deposit by ICP-MS

The method for determination of thallium in lead concentrate, zine concentrate, mixed leas-zine deposit was established. The sample was dissolved by hydrochloric acid, nitric acid and sulfuric acid, sulfur was removed by volatilization, the most of the lead and silicon were removed by precipitation method, the content of thallium in sample solution was determined by inductively coupled plasma mass spectrometry(ICP-MS). The method for correction and elimination of interference from matrix and major impurity elements in determination of thallium was studied, and the analysis method was optimized. The content of thallium has good relationship in the range of 0.01-10 μg/L, the linear correlation coefficient was 1.000, the detection limit was 0.0018 μg/L. The relative standard deviation of detection results was 1.42%-3.96%(n=11), and the recovery was 92.7%-106.8%. The method is simple, rapid, accurate and can be used for determination of thallium in lead-zinc concentrate,mixed lead-zinc mine.