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Theoretical equations for electrochemical processes preceded by concurrent first‐order chemical reactions in DC polarography: Application to the study of the interaction between guanine and diacetyl
Author(s) -
Mellado José Miguel Rodríguez,
Montoya Mercedes Ruiz,
Galvín Rafael Marín
Publication year - 1992
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/elan.1140040212
Subject(s) - polarography , chemistry , electrochemistry , diffusion , dimensionless quantity , steady state (chemistry) , nernst equation , kinetic energy , diffusion layer , thermodynamics , analytical chemistry (journal) , inorganic chemistry , electrode , chromatography , physics , quantum mechanics
Theoretical expressions are derived for electrochemical processes preceded by two concurent first‐order chemical reactions in dc polarography by using both the approximation of convective diffusion under the steady state conditions and the dimensionless differential equations of the Nernst diffusion layer approximation. These equations are formally identical to those obtained for CE and CEC processes, with differences only in the kinetic terms. Study of the interaction between guanine and diacetyl shows the usefulness of these equations. A value of 7 × 10 4 M is obtained for the formation constant of the adduct guaninediacetyl at 25°C.