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Studies on the Reaction Between Nitrite and Iodide by Using Microelectrodes in Stationary and Convective Systems
Author(s) -
Mori Vânia,
Bertotti Mauro
Publication year - 1999
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/(sici)1521-4109(199904)11:4<234::aid-elan234>3.0.co;2-w
Subject(s) - microelectrode , reaction rate constant , iodide , chemistry , platinum , electrode , sulfuric acid , kinetic energy , catalysis , nitrite , chemical reaction , mass transfer , reaction rate , briggs–rauscher reaction , analytical chemistry (journal) , inorganic chemistry , kinetics , chromatography , organic chemistry , physics , quantum mechanics , nitrate
Abstract The chemical reaction involving iodide and nitrite at the surface of platinum disk microelectrodes has been investigated in sulfuric acid medium. Experimental conditions were adjusted to achieve a quasi‐first order homogeneous catalytic reaction in quiescent solutions and the kinetic rate constant for this system was found to be 3.2×10 2 M –1 s –1 . Preliminary experiments where electrodes of different radii were used in a wall‐jet cell configuration under conditions of variable mass‐transfer are presented. The results indicate the advantages of using microelectrodes in this controllable convective system for determining kinetic rate constants of homogeneous chemical reactions coupled to electrode processes.