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    STUDIA CHEMIA - Issue no. 1 / 2004  
         
  Article:   KINETICS OF THIOLACTIC ACID OXIDATION BY DECAVANADATE AND VO2+ IN ACIDIC MEDIA.

Authors:  DANA-MARIA SABOU, IOAN BÂLDEA. 		 
       
         
  Abstract:  The oxidation of thiolactic acid by decavanadate and in aqueous acidic media, using perchloric acid, has been followed spectrophotometrically. A first-order dependence on decavanadate has been found for both the hydrolysis and the oxidation process as well as a first-order dependence on the substrate. The activation energy has been obtained. The oxidation by under the conditions of comparable concentration with the substrate, has been approached by a stopped-flow technique. The reaction obeys an 1.5 order dependence on ion, first-order in thiolactic acid and a complex (negative order) dependence on hydrogen ion concentration. The V(IV) intermediate valence state has been identified by ESR spectroscopy. Some suggestions on the mechanism were put on.  
         
     
         
         
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