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    STUDIA CHEMIA - Issue no. 1-2 / 1999  
         
  Article:   ELECROSYNTHESIS OF HYDROGEN PEROXIDE BY PARTIAL REDUCTION OF OXYGEN IN ALKALINE MEDIA. PART III. WALL-JET RING ELECTRODE FOR HYDROGEN PEROXIDE AMPEROMETRIC DETECTION.

Authors:  VICTOR ROSCA, PETRU ILEA, IONEL CĂTĂLIN POPESCU. 		 
       
         
  Abstract:  A wall-jet ring electrode system was selected as a convenient electrochemical device for amperometric detection of hydrogen peroxide, particularly when it was "in situ" generated by partial electro-reduction of dissolved oxygen in a flow-injection set-up. Steady-state amperometric measurements were performed at an applied potential corresponding to the diffusion-controlled plateau, previously reported for hydrogen peroxide oxidation on stainless steel ring electrode. The experimental parameters, electrolyte flow rate and inlet capillary nozzle to ring electrode distance, were established to ensure a wall-jet hydrodynamic regime. In these experimental conditions, a good linear dependence between the ring limiting current vs. hydrogen peroxide concentration was observed. Thus, it was proved that the hydrogen peroxide obtained during electro-reduction of dissolved oxygen at wall-jet disc electrode could be successfully monitored at a ring electrode, part of a wall-jet ring disc electrode.  
         
     
         
         
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