Determination of chromium and titanium in V-4Cr-4Ti alloy by inductively coupled plasma atomic emission spectrometry
CHENG Yong
Pangang Group Research Institute Co., Ltd., State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization, Panzhihua 617000, China;
Abstract：The composition of vanadium-chromium-titanium alloy for nuclear reaction materials should be strictly controlled within the following proportion relationship: V-(3%-5%)Cr-(3%-5%)Ti. The content of alloying elements including chromium and titanium is usually determined one by one using titration method. The operation is complex and the analytical period is long. The determination of chromium and titanium in V-4Cr-4Ti alloy by inductively coupled plasma atomic emission spectrometry (ICP-AES) can meet the test requirements of chromium and titanium in vanadium-chromium-titanium alloy such as rapidness, high efficiency and simultaneous determination.The spectral interference and matrix effect between vanadium and chromium as well as titanium were emphatically studied in vanadium-chromium-titanium ternary alloy system. The spectral interference experiments and analysis of more than 20 major spectral lines of chromium and titanium were conducted. The analytical lines of chromium and titanium with appropriate sensitivity and no overlapping interference from the coexisting components were finally selected. The results showed that the matrix effect of vanadium and continuous background superimposition had a positive interference on the determination. The influence was eliminated by matrix matching and synchronous background correction. The proposed method optimized the working conditions of instrument and the detection conditions of analytical lines such as integral area and background correction area. The verification test indicated that the detection range of chromium and titanium was between 2.50% and 6.00%. The linear correlation coefficients of calibration curves were higher than 0.9992. The content of chromium and titanium in two V-4Cr-4Ti alloy samples was determined according to the experimental method. The relative standard deviations (RSD, n=8) of determination results were less than 0.70%. The spiked recoveries were between 98% and 102%. The proposed method was applied for the determination of chromium and titanium in four vanadium-chromium-titanium alloy samples, and the found results were consistent with those obtained by redox titration method according to standard method GB/T 4698.10-1996 and YS/T 514.1-2009.
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