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    STUDIA CHEMIA - Issue no. 3 / 2007  
         
  Article:   DETERMINATION OF TOTAL ACID CONTENT IN WINE BASED ON THE VOLTAMMETRIC REDUCTION OF 1,4-BENZOQUINONE.

Authors:  MIHAELA RALUCA CIUMAG, MARIA JITARU.
 
       
         
  Abstract:  In this work, voltammetric determination of the total acid content in wine was made, by measuring the reduction prepeak current of p-benzoquinone (BQ). This prepeak is due to the presence of acids in unbuffered ethanol medium. The simple system of p-benzoquinone was found to be suitable for this determination, because of its reduction potential, stability and solubility in ethanol containing organic acids. On the voltammograms of BQ, obtained in standard synthetic ethanolic solutions of organic acids, such as tartaric, citric and acetic, a well-defined single prepeak appeared during the cathodic potential scan. Its height was proportional to the total acid concentration. The values of total acid content of 5 wine samples and of a vinegar sample were determined by the present method, which is superior in sensitivity and requires a very small volume of wine sample compared to the conventional potentiometric titration method.  
         
     
         
         
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