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Voltammetric determination of ubiquinone adsorption at mercury electrodes
Author(s) -
Wittstock Gunther,
Emons Hendrik
Publication year - 1997
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.1140090604
Subject(s) - adsorption , mercury (programming language) , enthalpy , chemistry , redox , electrochemistry , electrode , voltammetry , analytical chemistry (journal) , inorganic chemistry , thermodynamics , chromatography , physics , computer science , programming language
Adsorption isotherms of the ubiquinones UQ 4 , UQ 6 , UQ 9 and UQ 10 have been determined by two independent voltammetric techniques at the stationary mercury/solution interface. While the redox behavior is essentially the same for all homologues investigated, the molar free enthalpy of adsorption Δ A G increases steadily with the number of isoprenic units from UQ 4 to UQ 10 . In case of UQ 10 , the experiments have been carried out with three different potentiostatic systems. This allows one to estimate the accuracy of the methods which are direct ones and do not require calibration.