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    STUDIA GEOLOGIA - Issue no. 1 / 2007  
         
  Article:   ISOTOPE RATIO MASS SPECTROMETRY: ANALYSIS OF WINES FROM DIFFERENT ROMANIAN REGIONS.

Authors:  STELA CUNA, GABRIELA BALAS, NICOLAE LUPSA, VALENTIN MIREL, ALINA MAGDAS. 		 
       
         
  Abstract:  The authenticity and geographical origin of some wines produced in Romania were investigates by isotope ratio mass spectrometry (IRMS) methods. We have developed the method for determining 13C/12C and 18O/16O in wine ethanol and water from wine. The determination of 13C/12C of wine ethanol was performed in three steps: (i) 500 ml of a wine sample was distilled with a distillation apparatus with a constant reflux ratio of 10. The alcoholic distillate was collected with an ethanol content of about 93 % mass without significant isotope fractionation. (ii) The ethanol was converted into CO2 by combustion in excess of oxygen. (iii) The carbon isotope ratio of the CO2 obtained was analyzed by IRMS. The 18O/16O isotopic ratio of the water of wine was determined by IRMS using CO2, which was obtained after equilibration of wine and carbon dioxide. The samples of wine from the 2002, 2003, and 2004 vintages and from six different wine-growing regions of Romania were analyzed and the authenticity of these wines was tested.  
         
     
         
         
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