电感耦合等离子体原子发射光谱(ICP-AES)法测定尼日利亚铌钽锂矿石中的铌、钽、锂

经过三种样品前处理实验对比,选择采取氢氟酸-高氯酸-王水溶样,酒石酸-王水浸取,电感耦合等离子体原子发射光谱(ICP-AES)法测定尼日利亚地区铌钽矿石中铌、钽、锂元素。对元素的分析谱线、酒石酸浓度等工作条件进行了优化,选择各元素的最佳分析谱线,并进行加标回收实验,探讨了各元素的加标回收率。选取Nb 269.7 nm、Ta 240.0 nm、Li 670.78 nm作为仪器分析谱线,计算得到的方法检出限分别为:Nb 0.5μg/g、Ta 1.5μg/g、Li 15.0μg/g。对比各种溶样方法,选取一种最简洁方便的样品前处理途径,经国家一级标准物质GBW07153、GBW07155和GBW07185验证,测定值的相对误差为-2.82%~1.77%,方法精密度(RSD,n=6)为0.11%~1.2%,测定尼日利亚地区铌钽锂矿石中的铌、钽、锂元素,结果无显著性差异,方法能够满足尼日利亚铌钽矿石中相关组分的准确测定。

Detection of lithium niobium tantalum from niobium ore in Nigeria by inductively coupled plasma emission spectrometry

In this paper,the method for determination of niobium,tantalum and lithium in niobium and tantalum ores from Nigeria by inductively coupled plasma emission spectrometry after the sample was dissolved by hydrofluoric acid-perchloric acid-aqua regia and leached with tartaric acid-aqua regia was studied.The working conditions,such as the analytical spectrum of the elements and the concentration of tartaric acid,were optimized,the best analytical spectrum of each element was selected,and the recovery of each element was discussed by adding standard experiment.Nb 269.7 nm,Ta 240.0 nm and Li 670.78 nm were selected as the analytical lines.The detection limits of Nb 0.5μg/g,Ta 1.5μg/g and Li 15.0μg/g were calculated.In this paper,a simple and convenient sample pre-treatment method was selected and verified by GBW07153,GBW07155 and GBW07185.The relative error of the determination was-2.82%-1.77%.The precision of the method was 0.11%-1.2%,there is no significant difference in the determination of Nb,Ta and Li in niobium-tantalum lithium ore in Nigeria.This method can be used for accurate determination of related components in niobium-tantalum lithium ore in Nigeria.