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The effect of the removal of trace impurities on the adsorption behavior of octanoic acid at mercury–solution and at air–solution interfaces
Author(s) -
Avranas Antonis,
Retter Utz,
Lunkenheimer Klaus,
Lohse Heinz
Publication year - 1996
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.1140080712
Subject(s) - adsorption , impurity , surface tension , mercury (programming language) , chemistry , capacitance , inorganic chemistry , analytical chemistry (journal) , gibbs isotherm , chromatography , electrode , thermodynamics , organic chemistry , physics , computer science , programming language
In this article we explore the kinetics of adsorption of octanoic acid at the mercury‐water interface using phase sensitive AC voltammetry. These measurements were performed before and after stepwise purification of the octanoic acid solution, in order to distinguish between the adsorption behavior of the octanoic acid and its impurities. The adsorption of both octanoic acid and the surface active impurities decrease the capacitance with time. Removing the latter during the purification procedure results in a faster achievement of the equilibrium state and in higher capacitance values. The adsorption was also studied at the air‐water interface using dynamic surface tension measurements. Comparable results are obtained for both interfaces.