Highly sensitive spectrophotometric kinetic determination of vanadium by catalysis of the gallic acid-bromate reaction |
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| Authors: | Tsutomu Fukasawa Susumu Kawakubo Tatsuo Yamanouchi |
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| Affiliation: | Department of Applied Chemistry, Faculty of Engineering, Yamanazhi University, Takeda-4, Kofu-shi 400 Japan |
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| Abstract: | Conditions are described for improving the speed and sensitivity of this catalytic determination of vanadium. The reaction of 0.018 M gallic acid with 0.96 M sodium bromate at pH 3.8 and double-beam spectrophotometric measurement at 380 nm are recommended. The calibration curves are obtained by the tangent (2-point) and fixed-time (single-point) method. The highest practical sensitivity at 22–30°C was ca. 40 pg for an absorbance change of 0.0005, 50 times better than previously. The detection limit was ca. 0.5 ng of vanadium. Reaction at 50°C gave even better sensitivity. |
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