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    STUDIA CHEMIA - Ediţia nr.4 din 2014  
         
  Articol:   THE FAST FORMATION OF AN INTERMEDIATE IN THE CHROMIUM (VI) REDUCTION BY THIOLACTIC ACID – A KINETIC APPROACH BY MEANS OF THE STOPPED-FLOW TECHNIQUE.

Autori:  DANA-MARIA SABOU. 		 
       
         
  Rezumat:  The reaction between thiolactic acid and Cr(VI) in aqueous acidic solution at 295 K is a quite fast multi-step process, beginning with the formation of a condensation species, in an equilibrium that involves both the main reactants and H+  ions. The kinetics of this first step was studied by means of the stopped-flow and spectrophotometrical techniques. Reaction orders of one were found for both the thiolactic acid (RSH) and Cr(VI), showing a 1:1 combination ratio of the two in the intermediate. A fractional order was found in the case of the hydrogen ion, consistent with two parallel pathways: one assisted and one not assisted by H+ . 

Keywords: kinetics, thiolactic acid, chromium(VI), redox, stopped-flow