Abstract
In the presence of small amounts (~1O'5M)ofCu(II) ,the reaction between hydrogen peroxide and thiosulfateionin a stirred tank reactor exhibits one oscillatory and three stationary states as well as bistability between the oscillatory and one of the stationary states and between two stationary states.The amplitude of the oscillations can be as large as 4pHunits or 200m Vin the potential of a Ptredoxelectrode.Near the bistable regions,the system undergoes large over-and undershoots as the flow rate is varied.In the absence of the copper catalyst, only a single steady state is found, with no unusual dynamic alphenomena.Some tentative mechanistic suggestions are offered to account for this behavior.