Abstract:0.100 g of titanium alloy sample was dissolved with 10 mL of H2SO4(1+1) and 2-3 drops of HNO3. The solution was clear and could be kept for long time. The spectral interference of molybdenum, zirconium and niobium in titanium alloy was investigated. Finally, the determination of molybdenum, zirconium and niobium in titanium alloy by inductively coupled plasma atomic emission spectrometry (ICP-AES) was realized using Mo 202.031 nm, Zr 339.197 nm and Nb 269.706 nm as analytical lines. The certified reference materials of titanium alloy were treated according to the experimental method,and the molybdenum, zirconium and niobium standard solution was added into titanium base solution to prepare the series standard solution for the preparation of calibration curve,respectively. The correlation coefficients (r) of calibration curves were higher than 0.999. However, there were few certified reference materials of titanium alloy in market containing molybdenum, zirconium and niobium simultaneously. Therefore, the standard series solution was prepared by adding molybdenum, zirconium and niobium standard solution into titanium base solution. The detection limits of elements were less than 0.005%. The calibration curves were plotted by two preparation methods of standard solution,then the precision was tested using one titanium alloy sample. The relative standard deviations (RSD, n=10) were less than 1.0%. The proposed method was applied to the analysis of national standard materials, and the found results were consistent with the certified values. The error was within the permissible range of national standard to meet the requirements of production and scientific research. The proposed method was applicable for the determination of titanium alloy containing niobium with the mass fraction no more than 5%.
ASTM E2371-13 Standard test method for analysis of titanium and titanium alloys by atomic emission spectrometry [S].
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