Abstract
The effects of viscosities and sol-gel transition on the conductivity of alkali metal chlorides (MCl) and the electro-deposition and -dissolution of thallium were studied in poly (ethylene oxide)-H_2O and agarose (II) -H_2O media. Deviations from extended Walden's rule were generally observed for the molar conductivities of MCI in the poly (ethylene oxide) solutions. The deviation is considered to be related with the difference in the entropic terms for the ionic migration and viscous flow, which may be due to the loose network structure of poly (ethylene oxide) molecules in the solution. No significant effects of the sol-gel transition appeared on the electrode processes of thallium in agarose (II)- H_2O media. The anodic dissolution peak current of thallium at a rotating gold electrode was found to be practically independent of rotation speed in solutions containing poly (ethylene oxide) of very high molecular weights.
