柠檬酸-孔雀石绿系统催化动力学光度法测定痕量钒

Determination of trace vanadium(V) by citric acid-malachite catalytic kinetic spectrophotometry

This paper was focused on the determination of trace vanadium(V)by catalytic kinetic spectrophotometric method.In this method,the vanadium(V)can catalyze the fading reaction that potassium periodate acted on malachite green.Best experimental conditions were studied and a new method of catalytic kinetic spectrophotometric determination of vanadium(V)was established.Under selected experimental conditions,the absorbency difference △A remained good linear relationship with quality concentration ρ of vanadium(V)in the range of 0.1–1.5 ug/25 mL and the detection limit was 7.87×10-10 g/mL.Dynamic parameters were determined and showed that the reaction was pseudo first-order kinetics equation.Apparent ratio constant of the reaction was 7.39×10-4 /s and apparent active energy was 63.60 kJ/mol.RSD of 12 times determination of 1 μg V(Ⅴ)/25 mL standard solution was 1.25%.In the determination of trace Vanadium(V)in sinter I and sinter III,the recovery ratio was between 97.6–107.6%.The experiment result was satisfactory.