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Phase Sensitive Alternating Current Polarography: A Chemometric Approach for the Selection of Phase Angles
Author(s) -
Garrigosa Anna Maria,
Alberich Arístides,
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.200603691
Subject(s) - polarography , capacitive sensing , alternating current , phase angle (astronomy) , current (fluid) , phase (matter) , analytical chemistry (journal) , materials science , faradaic current , voltage , chemistry , computer science , electrochemistry , optics , electrode , chromatography , physics , thermodynamics , electrical engineering , engineering , inorganic chemistry , organic chemistry , reference electrode , operating system
A method based on the combined use of multivariate curve resolution by alternating least squares (MCR‐ALS) with phase sensitive alternating current polarography (ACP) is proposed to evaluate the phase angle where capacitive current is minimized in a much more accurate way than the visual inspection of ACP signals. The method allows, through the analysis of series of AC polarograms measured at different phase angles out the potential, to distinguish between faradaic and capacitive contributions. Then the angle at which the capacitive current is negligible can be shown and, in some cases, the influence of adsorption on measured currents minimized.