电感耦合等离子体原子发射光谱法测定矿石样品中钨

建立了电感耦合等离子体原子发射光谱法测定矿石样品中钨的新方法。采用Na2O2熔融分解矿石样品,热水浸取,使钨完全进入碱性溶液,再向分取定量体积的碱性溶液中加入适量的酒石酸溶液络合钨,然后加入50 mL HCl(1+9)溶解,并在波长224.875{149}nm处于选定的仪器参数下以电感耦合等离子体原子发射光谱法测定溶液中的钨。样品前处理简单、快速,且在波长224.875{149}nm处钨未受到其它元素明显的光谱干扰。溶液中钨原子发射光谱强度与ρ(WO3)在0~20μg/mL范围内呈良好的线性关系,校准曲线相关系数为0.99998。方法检出限为0.040μg/mL。用本方法测定了标准物质中钨的含量,测定值与认定值吻合,相对标准偏差(n=4)为0.99%~2.6%。

Determination of tungsten in mineral samples by inductively coupled plasma atomic emission spectrometry

A novel method for the determination of tungsten in mineral samples by inductively coupled plasma atomic emission spectrometry was developed.The mineral samples were melted and decomposed by Na_2O_2.After being leached with hot water, the tungsten could be completely dissolved into the base solution.Proper tartaric acid was added into a certain volume of base solution to form complex with tungsten.The complex was then dissolved with 50 mL of HC1(1+9), and the content of tungsten in the solution was determined by inductively coupled plasma atomic emission spectrometer at 224.875{149} nm under the selected instrumental parameters.The pretreatment of sample was simple and fast.Moreover, the spectrum interference of other elements on tungsten was not significant at the wavelength of 224.875{149} nm.There was a good linear relationship between emission intensity of tungsten and ρ(WO_3)in the solution in the range of 0-20 μg/mol.The correlation coefficient of calibration curve was 0.99998, and the detection limit of this method was 0.040 μg/mL.The content of tungsten in standard sample was determined by this method and the results were consistent with the certified values, with the relative standard deviation(n=4)between 0.99%-2.6%.