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    STUDIA CHEMIA - Issue no. 1 / 2007  
         
  Article:   CARBON PASTE ELECTRODES INCORPORATING SYNTHETIC ZEOLITES AND METHYLENE BLUE FOR AMPEROMETRIC DETECTION OF ASCORBIC ACID.

Authors:  DELIA M. GLIGOR, LIANA MUREŞAN. 		 
       
         
  Abstract:  Two new electrodes were obtained by incorporating two synthetic zeolites modified with Methyene Blue (MB) in carbon paste. The electrochemical behavior of the modified electrodes (MB-13X-CPES and MB-4A-CPEs) was investigated using cyclic voltammetry and the independence of formal standard potential vs. the pH of the surrounding solution was put on evidence. The modified electrodes were successfully tested for electrocatalytic oxidation of ascorbic acid (AA) in phosphate buffer (pH 7.0), at an applied potential with more than 500 mV lower than that used on unmodified carbon paste electrodes. The amperometric sensors for ascorbic acid were characterized by a linear concentration range of 10-5 M - 10-3 M AA for MB-13X-CPEs and 10-5 M - 10-4 M AA for MB-4A-CPEs. The theoretical detection limits, calculated from the slope of the regression equation and standard deviation of the calibration curve, were 4.7x10-5 M for MB-13X-CPEs and 1.7x10-5 M for MB-4A-CPEs.  
         
     
         
         
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