A sensitive catalytic spectrophotometric method for the determination of ruthenium （Ⅲ） has been developed, based on its catalytic effect on the oxidation reaction of methyl green with potassium bromate in acid solu...A sensitive catalytic spectrophotometric method for the determination of ruthenium （Ⅲ） has been developed, based on its catalytic effect on the oxidation reaction of methyl green with potassium bromate in acid solution medium at 100℃. The above reaction is followed spectrophotometrically by measuring the decrease in the absorbance at 625 nm for the catalytic reaction of methyl green. The calibration curve for the recommended reaction-rate method was linear in the concentration range over 0.00-0.80 μg/L and the detection limit of the method for Ru （III） is 0.006 μg/L. Almost no foreign ions interfered in the determination at less than 25-fold concentration of Ru （Ⅲ）. The method is highly sensitive, more selective and very stable, and has been successfully applied for the determination of trace ruthenium in some ores and metallurgy products.展开更多
A flow injection method is proposed for determining vanadium（V）. The method is based on its catalytic effect on the oxidation of malachite green oxalate by bromate. The reaction was monitored spectrophotometrically ...A flow injection method is proposed for determining vanadium（V）. The method is based on its catalytic effect on the oxidation of malachite green oxalate by bromate. The reaction was monitored spectrophotometrically by measuring malachite green oxalate absorbance at λmax = 625 nm. The reagents and manifold variables, which have influences on the sensitivity, were investigated and the optimum conditions were established. The optimized conditions made it possible to determine vanadium in the ranges of 10-140 ng/mL with a detection limit of 5.2 ng/mL and a sample rate of 20 ± 5 samples/h.展开更多
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...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.展开更多
基金Project 0520002 supported by Natural Science Foundation of Jiangxi Province, China
文摘A sensitive catalytic spectrophotometric method for the determination of ruthenium （Ⅲ） has been developed, based on its catalytic effect on the oxidation reaction of methyl green with potassium bromate in acid solution medium at 100℃. The above reaction is followed spectrophotometrically by measuring the decrease in the absorbance at 625 nm for the catalytic reaction of methyl green. The calibration curve for the recommended reaction-rate method was linear in the concentration range over 0.00-0.80 μg/L and the detection limit of the method for Ru （III） is 0.006 μg/L. Almost no foreign ions interfered in the determination at less than 25-fold concentration of Ru （Ⅲ）. The method is highly sensitive, more selective and very stable, and has been successfully applied for the determination of trace ruthenium in some ores and metallurgy products.
文摘A flow injection method is proposed for determining vanadium（V）. The method is based on its catalytic effect on the oxidation of malachite green oxalate by bromate. The reaction was monitored spectrophotometrically by measuring malachite green oxalate absorbance at λmax = 625 nm. The reagents and manifold variables, which have influences on the sensitivity, were investigated and the optimum conditions were established. The optimized conditions made it possible to determine vanadium in the ranges of 10-140 ng/mL with a detection limit of 5.2 ng/mL and a sample rate of 20 ± 5 samples/h.
文摘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.
