Abstract
At constant cd the potential vs log (time) graphs consist of sections with different slopes; so do the steady-state potential vs SO 4 2− concentration graphs. At the same total cd, the abrupt changes in slope occur at practically the same potentials. The change of potential with time is thus interpreted as being caused by the adsorption of sulphate species, which then become inactive in persulphate formation. This process can be described by first-order kinetics in terms of the active sulphate ions.
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