Determination of titanium dioxide in blast furnace slag containing vanadium and titanium by nitrous oxide-acetylene flame atomic absorption spectrometry
WANG Yong,CHEN Xiao-yi,LIU Lin
Product Quality Supervision and Testing Institute of Panzhihua, National Quality Supervision and Testing Center of Vanadium and Titanium Products, Panzhihua 617000, China
Abstract：Blast furnace slag containing vanadium and titanium has low reaction activity and the sample is hardly dissolved. The blast furnace slag containing vanadium and titanium was dissolved with sulfuric acid-nitric acid-hydrofluoric acid system (volume ratio of 1∶2.5∶1) by heating at 90-100 ℃. The solution acidity was adjusted to 1.0 mol/L with hydrochloric acid in order to avoid the hydrolysis of titanium ion. Potassium chloride was added to inhibit the ionization of titanium at high temperature. Consequently, a determination method of titanium dioxide in blast furnace slag containing vanadium and titanium was established by nitrous oxide-acetylene flame atomic absorption spectrometry. The dissolution and determination condition was optimized. The results showed that Lambert-Beer′s law was obeyed for mass concentration of titanium in range of 4-30 μg/mL. The linear correlation coefficient was 0.999 1. The detection limit was 1.7 mg/g. The proposed method was applied to the determination of titanium dioxide in certified reference material and actual sample of blast furnace slag containing vanadium and titanium. The results were consistent with the certified values. The relative standard deviations (RSD, n=5) were less than 0.4%.
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