A solid-state redox buffer as interface of solid-contact ISEs

作者：Scholz Fritz^*; Kahlert Heike; Hasse Ulrich; Albrecht Anja; Kuate Alain C Tagne; Jurkschat Klaus

来源：Electrochemistry Communications, 2010, 12(7): 955-957.

DOI：10.1016/j.elecom.2010.04.031

• Modified electrodes
• Solid-contact ion-selective electrodes
• Redox buffer

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.

• 出版日期2010-7