Electroreduction of methyl viologen in the presence of nitrite. Its influence on enzimatic electrodes

N.F. FERREYRA; S.A. DASSIE; V.M. SOLIS

JOURNAL OF ELECTROANALYTICAL CHEMISTRY

ELSEVIER

Lugar: Amsterdam; 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.