Abstract：Nickel-titanium-niobium alloy is an important functional material, and the content of titanium significantlyaffects the properties of alloy. The high content titanium in nickel-titanium-niobium alloy was determined by spectrophotometry using hydrogen peroxide as coloring agent. The sample was dissolved with diluted sulfuric acid. Hydrogen peroxide was added at room temperature to react with titanium to form a yellow complex. The absorbance was measured at 410nm. The factors influencing the coloring of system were optimized including the acidity, the dosage of hydrogen peroxide and coloring time. Under the optimized testing conditions, the Beer's law was obeyed for the mass concentration of titanium in range of 70.0-80.0μg/mL, and the apparent molar absorptivity was 1.5×102 L·mol-1·cm-1. The sample solution could be directly determined, which avoided the error caused by dilution. The interference of nickel could be eliminated by matrix matching method. The contents of titanium in two Ni-Ti-Nb alloy samples were determined according to the experimental method. The relative standard deviation (RSD, n=6) of determination results was 0.40% and 0.30%, respectively. The determination results were consistent with those obtained by titration method. The proposed method was applied for the accurate determination of high content titanium in nickel-titanium-niobium alloy.
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