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    STUDIA CHEMIA - Issue no. 1-2 / 2000  
         
  Article:   THE EFFECT OF COPPER, LEAD AND IRON IONS ON THE OXIDATION OF MERCAPTOSUCCINIC ACID BY CHROMATE.

Authors:  ALEXANDRA RUSTOIU-CSAVDARI, IOAN BÂLDEA. 		 
       
         
  Abstract:  The effect of copper, lead and iron ions on the oxidation of mercaptosuccinic acid (thiomalic acid or TMA) by chromate in acidic media has been investigated in order to draw a conclusion about its potential use in kinetic analysis. Similar studies have been carried out for the oxidation of mercaptoacetic acid (thioglycolic acid or TGA), but only in the presence of lead. All ions increase the overall reaction rate: the Fe(II)-Fe(III) couple via an induction mechanism, while the Cu(I)-Cu(II) and Pb(II)-Pb(IV) couples via catalytic cycles. Reaction mechanisms have been proposed for all cases and "saturation" at high ion concentration has been explained. The effect of five other metal ions on both TMA and TGA oxidation has also been checked. Finally, the possible applications of both indicator reactions among kinetic methods of analysis are discussed and some recommendations are made.  
         
     
         
         
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