Determination of eight impurity elements in sponge hafnium by inductively coupled plasma atomic emission spectrometry
WANG Lei1,2,3,4, MENG Yilin1,2,3,4, GAO Shuai1,2,3,4, YAN Jing1,2,3,4, LI Yanchang1,2,3,4
1. AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China; 2. Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation, Beijing 100095, China; 3. Key Laboratory of Science and Technology on Aeronautical Materials Testing and Evaluation, Aeroengine Corporation of China, Beijing 100095, China; 4. Aviation Key Laboratory of Science and Technology on Materials Testing and Evaluation, Beijing 100095, China
Abstract：Sponge hafnium has strict requirements to the type and content of impurity element. The current detection methods are difficult to determine eight impurity elements (including tungsten, nickel, manganese, titanium, vanadium, molybdenum, cobalt, and copper) rapidly and accurately in sponge hafnium. In experiments, the sample was dissolved with nitric acid and hydrofluoric acid. The calibration curves were prepared by matrix matching method to eliminate the influence of matrix effect. The contents of tungsten, nickel, manganese, titanium, vanadium, molybdenum, cobalt, and copper in sponge hafnium were determined by inductively coupled plasma atomic emission spectrometry (ICP-AES). The proposed method enabled to determine tungsten, nickel, manganese, titanium, vanadium, molybdenum, cobalt, and copper in sponge hafnium with content in range of 0.001%-0.010% (mass fraction, similarly hereinafter). The mass concentration of elements in range of 0.10-3.00 μg/mL had good linear relationship with the corresponding intensity of emission spectrum, and the linear correlation coefficients were greater than 0.999. The limits of detection for each elements were not more than 0.000 5%, and the limits of quantification were not more than 0.001 5%. Eight impurity elements in sponge hafnium were determined according to the experimental method. The relative standard deviations (RSD, n=8) of determination results were between 4.3% and 9.8%. The found results were consistent with those obtained by inductively coupled plasma mass spectrometry (ICP-MS).
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