Determination of vanadium in steel and alloy by liquid-liquid microextraction spectrophotometry
WANG Tong1, ZENG Ying*1, ZHANG Lu2, XU Jin-yong2
1.College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu 610059, China; 2 .College of Nuclear Technology and Automation Engineering, Chengdu 610059, China
Abstract：A liquid-liquid microextraction spectrophotometric determination of vanadium in steel and alloy was established with a self-designed 50 μL-droplet-absorbance spectrophotometer. Optimal determination results were obtained with 0.50 mL of extraction agent (trichloromethane) and 2.0 g/L tantalum reagent trichloromethane solution at an extraction time of 60 s. It was found that, vanadium showed a fine linear relationship with its absorbance within the range of 0.025-0.5 μg/mL. The linear equation was A=4.135 ρ with correlation coefficient r=0.999. The detection limit was 0.002 μg/mL. This method has been used to determine vanadium in steel and alloy certified reference materials, whose results were consistent with the certified values. The relative standard deviation (RSD,n=5) was 1.5%-4.1%.
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