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 Na2O2.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 HCl(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(WO3) in the solution in the range of 0-20 μg/mol.The correlation coefficient of calibration curve was 0.999 98,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 %.