Determination of Uranium Content in Natural Uranium Products by X-ray Fluorescence Spectrometry
A method for determining uranium content in natural uranium products(U3 O8)by wave-length dispersive X-ray fluorescence spectrometry was established using solution sample preparation and strontium carbonate as the internal standard.The method determines that the weight of the sam-ple is 1.00 g,and the weight of the internal standard strontium carbonate is 0.600 g.The sample is digested with 15 mL of phosphoric acid and 2 mL of nitric acid to a constant volume of 200 mL.After stirring with magnetic force,the volume of the solution is controlled using a disposable plastic pipette and an electronic scale.Instrument measurement conditions selection feature X-ray line:U-Lα1,Sr-Kα1,channel mask 34 mm,primary collimator 150μm.The linear correlation coefficient of the work-ing curve of the method is 0.999 8,and the relative standard deviation(RSD)is between 0.031％and 0.050％,indicating good precision;The relative error between the measurement results and the rec-ommended value of the reference material is not less than 0.034％,with good accuracy.Compared with the potentiometric titration method,the absolute deviation of this method is between 0.010％and 0.126％,and the results are accurate and reliable,meeting the requirements for rapid batch anal-ysis of natural uranium products.
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