A Liquid/Liquid-Type Heteropolyanion Reference Electrode for Ion-Transfer Voltammetry
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A new liquid/liquid-type reference electrode for ion-transfer voltammetry with the nitrobenzene (NB)/water (W) interface has been developed. This reference electrode is expressed as Pt/1.8 mM α-[SiMo12O40]4- + 0.2 mM α-[SiMoV2Mo12O40]4- + 0.1 M H2SO4 (W)/0.3 mM α-[SiMo12O40]4- + 0.02 M tetrahexylammonium tetraphenylborate (NB). The Galvani potential difference between the reference NB/W interface is determined virtually by the distribution equilibrium of the heteropolyanion (α-[SiMo12O40]4-), whereas the Pt electrode potential is determined by the redox equilibrium of the heteropolyanion couple. With this reference electrode, a potential window of about 0.4 V is available in a fairly negative potential region, where the transfer of hydrophilic inorganic anions (Br-, I-, SCN-, NO3-, and ClO4-) can be observed voltammetrically.
- Analytical Sciences
Analytical Sciences 14(1), 157-162, 1998-02-10
The Japan Society for Analytical Chemistry