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    STUDIA CHEMIA - Issue no. 1-2 / 2000  
         
  Article:   THE HYDROGEN PEROXIDE – IODIDE REACTION IN KINETIC ANALYSIS. AN ATTEMPT FOR MULTICOMPONENT CALIBRATION.

Authors:  ALEXANDRA RUSTOIU-CSAVDARI, IOAN BĂ‚LDEA, LUCIAN COPOLOVICI, DANA MIHAI. 		 
       
         
  Abstract:  The applications of the Landolt-type hydrogen peroxide – iodide reaction has been extended to other species than those mentioned in the literature, such as vanadium, copper and iron. Detection of the incubation time was carried out visually. Reaction conditions towards Mo(VI) and V(V) were optimized and calibration lines t0/t versus catalyst concentration were drawn. Further, the most often cited interferents, that is Cu(II) and Fe(III), were added to the reaction mixture and the joint behavior of V(V)-Cu(II), Cu(II)-Fe(III) and Mo(VI)-Cu(II)-Fe(III) matrixes have been studied. Their joint catalytic effect was proved to be neither additive nor synergistic. Bi-component and tri-component calibration models based on a t0/t = f {[ion1],[ion2]} response surface or on a family of such surfaces respectively, were proposed. Results of visual and potentiometric detection of the reaction end-point were compared. The two methods have comparable performances.  
         
     
         
         
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