Isopotential points in the electrosorption of selenite, selenate, selenide, and tellurite at the platinum rotating disc electrode

Electrosorption at the platinum rotating disc electrode in sulfuric acid solutions of selenite, selenate, selenide, and tellurite gives rise to isopotential points in the potential range where oxidation of platinum occurs. The data are analyzed with the framework of the model put forward by Untereker and Bruckenstein. Since similar behavior is observed for the selenite, selenate, and selenide systems, it is tentatively inferred that a common electrosorbed species, possibly selenium itself, may be involved in these systems.