IN-SITU MONITORING OF PEROXODISULFATE ANION PRODUCTION

A direct, continuous method for the measurement of peroxodisulfate ani on has been devised and assessed. The approach is based upon the reduc tion of the anion under mass transfer limiting conditions at an amalga mated copper rotating disk electrode. The preparation of the disk elec trode by He electroplating was examined in detail in order to generate a reproducible surface. The system was calibrated by demonstrating th at the limiting current density for peroxodisulfate reduction was dire ctly proportional to its bulk solution concentration. An electrochemic al cell arrangement was then developed to permit the continuous, in si tu measurement of peroxodisulfate concentration during electrochemical synthesis.