[Kinetic spectrophotometric determination of vanadium in steel samples with indigo carmine and potassium bromate redox system].
A sensitive and selective kinetic spectrophotometric method for the determination of trace vanadium at room temperature (25 degrees C) was developed, based on its catalytic effect on the oxidation of indigo carmine with potassium bromate in 1.0 mol.L-1 phosphoric acid medium. The linear calibration range and detection limit are 0.02-1.0 microgram.mL-1 and 0.02 microgram.mL-1, respectively. The apparent activation energy of the quasi-zero-order catalytic reaction is 50.6 kJ.mol-1. The method is simple and rapid. In the presence of NaF, most of the common ions did not interfere to the determination of vanadium. The method was applied to the direct determination of vanadium in steel samples with satisfactory results.
Bai
Lin-shan
LS
East China Institute of Metallurgy, Department of Chemical Engineering, Maanshan 243002, China.
Zhang
Jin-hua
JH
Zhang
Shi-huan
SH