Electroreduction of methyl viologen in the presence of nitrite: its influence on enzymatic electrodes?

N. FERREYRA, S. DASSIE, V. SOLIS

JOURNAL OF ELECTROANALYTICAL CHEMISTRY

Año: 2000 vol. 486 p. 126 - 132

0022-0728

The electroreduction of methyl viologen (MV) in the presence of nitrite was studied by cyclic voltammetry. A catalytic wave for the reduction of MV2 was observed at 0.740 V for which an EC catalytic mechanism is proposed. The rate constant for this chemical reaction under pseudo-first-order conditions, evaluated using working curves, was employed in the simulation of the voltammetric response. The second-order rate constant was also evaluated. Influences of the reaction at 0.800 V on enzymatic electrodes employing nitrate reductase (NR) and MV. as mediator were also analysed by chronoamperometry. electrodes employing nitrate reductase (NR) and MV. as mediator were also analysed by chronoamperometry. electrodes employing nitrate reductase (NR) and MV. as mediator were also analysed by chronoamperometry. this chemical reaction under pseudo-first-order conditions, evaluated using working curves, was employed in the simulation of the voltammetric response. The second-order rate constant was also evaluated. Influences of the reaction at 0.800 V on enzymatic electrodes employing nitrate reductase (NR) and MV. as mediator were also analysed by chronoamperometry. electrodes employing nitrate reductase (NR) and MV. as mediator were also analysed by chronoamperometry. electrodes employing nitrate reductase (NR) and MV. as mediator were also analysed by chronoamperometry. this chemical reaction under pseudo-first-order conditions, evaluated using working curves, was employed in the simulation of the voltammetric response. The second-order rate constant was also evaluated. Influences of the reaction at 0.800 V on enzymatic electrodes employing nitrate reductase (NR) and MV. as mediator were also analysed by chronoamperometry. electrodes employing nitrate reductase (NR) and MV. as mediator were also analysed by chronoamperometry. electrodes employing nitrate reductase (NR) and MV. as mediator were also analysed by chronoamperometry. 2 was observed at 0.740 V for which an EC catalytic mechanism is proposed. The rate constant for this chemical reaction under pseudo-first-order conditions, evaluated using working curves, was employed in the simulation of the voltammetric response. The second-order rate constant was also evaluated. Influences of the reaction at 0.800 V on enzymatic electrodes employing nitrate reductase (NR) and MV. as mediator were also analysed by chronoamperometry. electrodes employing nitrate reductase (NR) and MV. as mediator were also analysed by chronoamperometry. electrodes employing nitrate reductase (NR) and MV. as mediator were also analysed by chronoamperometry. 0.800 V on enzymatic electrodes employing nitrate reductase (NR) and MV. as mediator were also analysed by chronoamperometry.. as mediator were also analysed by chronoamperometry.