Minimization of Electrode Adsorption Effects: The Cadmium–Humic Acid System Studied by Phase Sensitive Alternating Current Polarography
✍ Scribed by Anna M. Garrigosa; Cristina Ariño; José Manuel Díaz-Cruz; Miquel Esteban
- Publisher
- John Wiley and Sons
- Year
- 2006
- Tongue
- English
- Weight
- 406 KB
- Volume
- 18
- Category
- Article
- ISSN
- 1040-0397
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✦ Synopsis
Abstract
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).