Abstract：During the determination of niobium in vanadium-titanium magnetite by chlorosulfophenol C spectrophotometry, there was a problem of the difficult sample decomposition. Meanwhile, titanium in sample was easily hydrolyzed to interfere with the coloration, and vanadium could also complex with chlorosulfophenol C to interference with the determination. After the sample was dissolved with hydrochloric acid-hydrofluoric acid sulfuric acid (1+1), tartaric acid was added as masking reagent to eliminate the interference of titanium and vanadium. Consequently, the determination of niobium in vanadium-titanium magnetite by chlorosulfophenol C spectrophotometry was realized. The results showed that the Beer′s law was obeyed between the mass concentration of niobium in range of 0.050-0.500μg/mL and its corresponding absorbance in 0.5-3.0mol/L hydrochloric acid medium. The correlation coefficient was 0.9999. The detection limit of method was 0.002% (mass fraction), and the lower determination limit was 0.005% (mass fraction). The interference tests indicated that the interference of coexisting elements in sample with the determination of niobium could be ignored. The content of niobium in three vanadium-titanium magnetite samples was determined according to the experimental method. The relative standard deviations (RSDs, n=6) of determination results were less than 1.0%. Six vanadium-titanium magnetite samples were determined according to the experimental method, and the found results were in good agreement with those obtained by inductively coupled plasma atomic emission spectrometry (ICP-AES)
周礼仙, 汪雪梅. 氯代磺酚C分光光度法测定钒钛磁铁矿中铌[J]. 冶金分析, 2019, 39(6): 70-75.
ZHOU Li-xian, WANG Xue-mei. Determination of niobium in vanadium-titanium magnetite by chlorosulfophenol C spectrophotometry. , 2019, 39(6): 70-75.
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