电感耦合等离子体质谱法测定煤矸石中的钍和铀

Determination of thorium and uranium in coal gangue by inductively coupled plasma mass spectrometry

采用硝酸-氢氟酸-双氧水体系微波消解样品,建立了电感耦合等离子体质谱法(ICP-MS)快速准确测定煤矸石中钍和铀的方法。通过实验确定了最佳的样品处理条件,以铑为内标校正基体干扰,钍和铀的检出限分别为0.006 6、0.002 8μg/g,标准曲线线性相关系数均>0.999 9。将实验方法应用于煤矸石实际样品分析,测定结果的相对标准偏差(RSD,n=11)为0.75%~2.54%,加标回收率为98.00%~103.60%。ICP-MS法可准确测定煤矸石中钍和铀的含量,对预防和控制其对坏境的污染以及评价工业利用价值具有一定的指导意义。

A rapid and accurate method for the determination of thorium and uranium in coal gangue was established by inductively coupled plasma mass spectrometry(ICP-MS), using nitric acid-hydrofluoric acid-hydrogen peroxide system for microwave digestion of samples. The optimum sample treatment conditions were determined through experiments, Rhodium was used as the internal standard to correct the matrix interference, the detection limits of thorium and uranium were0.006 6 and 0.002 8 μg/g, respectively, and the linear correlation coefficients of the standard curves were >0.999 9. The experimental method was applied to the analysis of actual samples of coal gangue, the relative standard deviation(RSD,n=11) of the determination results was 0.75%-2.54%, and the recovery rate of spiked standard was 98.00%-103.60%.The content of thorium and uranium in coal gangue by ICP-MS method can accurately determine, which has certain guiding significance for preventing and controlling its pollution to the environment and evaluating the value of industrial utilization.