Determination of 7 elements in titanium alloy by inductively coupled plasma atomic emission spectrometry
LIAN Weijie1, YU Qiong1, ZHAI Yuxin1,2, DU Xiwang1, LI Shuang1, MA Lan*1
1. Ningbo Branch of China Academy of Ordnance Science,Ningbo 315103,China; 2. Ningbo Surface Engineering Research Institute Co., Ltd.,Ningbo 315000,China
Abstract：The contents of aluminum, silicon, iron, vanadium, molybdenum, niobium and zirconium in titanium alloy greatly affect its thermal and mechanical properties. Therefore, it is necessary to accurately determine the contents of these seven elements. The sample was dissolved with hydrochloric acid-hydrochloric acid-nitric acid system. The influence of matrix effect was eliminated by the matrix matching method. Consequently, an analytical method for determination of aluminum, silicon, iron, vanadium, molybdenum, niobium and zirconium in titanium alloy was established by inductively coupled plasma atomic emission spectrometry (ICP-AES) with Al 308.215 nm, Si 251.611 nm, Fe 259.940 nm, V 311.071 nm, Mo 202.030 nm, Nb 309.418 nm and Zr 339.198 nm as the analytical lines. The interference test results showed that the coexisting elements had no influence on the determination. The linear correlation coefficients of calibration curves were all greater than 0.999 1. The limits of detection of method were in range of 0.000 5%-0.002 6%. The determination results of each element were stable within 24 h. The contents of aluminum, silicon, iron, vanadium, molybdenum, niobium and zirconium in titanium alloy samples were determined according to the proposed method. The relative standard deviations (RSD, n=11) of determination results were between 0.86% and 3.9%. The contents of aluminum, silicon, iron, vanadium, molybdenum, niobium and zirconium in certified reference materials/standard samples of titanium alloy were determined. The relative errors between the determination results and the certified/standard values were all not more than 3.8%.
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