Journal
ELECTROCHEMISTRY COMMUNICATIONS
Volume 12, Issue 7, Pages 955-957Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2010.04.031
Keywords
Modified electrodes; Solid-contact ion-selective electrodes; Redox buffer
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Graphite with a surface-confined redox buffer system was used as solid contact in solid-contact ion-selective electrodes (SC-ISE). Potentiostatically preconditioning of the redox buffer ensures that the ratio of oxidized and reduced groups is unity, i.e., a maximum buffer capacity. These SC-ISEs exhibited a very high reproducibility and stability of potentials. Graphite modification was achieved by generating carboxylic surface groups via oxidation with nitrosulfuric acid and subsequent modification of the acidic groups with n-(2,5-dimethoxyphenyl)ethyl-1-amine (DMPEA). Composite electrodes of modified graphite and polymethylmetharcrylate (PMMA) as binder were used as solid-contact of polymer membrane K(+)-and F(-)-sensitive SC-ISEs. The solid-state redox buffer decreased potential variation from several hundred mV to just a few mV. (C) 2010 Elsevier B.V. All rights reserved.
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