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Minimization of Electrode Adsorption Effects: The Cadmium–Humic Acid System Studied by Phase Sensitive Alternating Current Polarography
Author(s) -
Garrigosa Anna M.,
Ariño Cristina,
DíazCruz José Manuel,
Esteban Miquel
Publication year - 2006
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.200603548
Subject(s) - polarography , adsorption , electrode , chemistry , dropping mercury electrode , analytical chemistry (journal) , faradaic current , metal , inorganic chemistry , alternating current , phase (matter) , cadmium , electrode potential , chromatography , electrochemistry , thermodynamics , organic chemistry , power (physics) , physics
The use of phase‐sensitive Alternating Current Polarography (ACP) is investigated for the minimization of adsorption effects in metal‐ligand systems with induced metal adsorption onto the electrode. When ACP is applied to obtain information on metal complexation in bulk, some problems arise from the faradaic contribution of adsorbed species. This effect can be corrected by using the capacitive current measured in the potential region of the faradaic peak. Using this correction, ACP produces similar results to those from Reverse Pulse Polarography (RPP), a technique that minimizes electrode adsorption effects on the measured currents. The method proposed is applied to the study of the Cd–humic acid system that has been investigated by ACP, RPP and Differential Pulse Polarography (DPP).