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    STUDIA CHEMIA - Ediţia nr.3 din 2009  
         
  Articol:   COMPARATIVE STUDY OF CARBON PASTE ELECTRODES MODIFIED WITH METHYLENE BLUE AND METHYLENE GREEN ADSORBED ON ZEOLITE AS AMPEROMETRIC SENSORS FOR H2O2 DETECTION.

Autori:  DELIA GLIGOR, LEVENTE ABODI, LIANA MARIA MUREȘAN.
 
       
         
  Rezumat:  

Methylene Blue (MB) and Methylene Green (MG) adsorbed on a synthetic zeolite (13X) and incorporated in carbon paste resulted in modified electrodes (MB-13X-CPEs and MG-13X-CPEs) with electrocatalytic activity for H2O2 reduction. Using the treatment proposed by Laviron, the heterogeneous electron transfer rate constant (ks) was estimated, and values between 2.9 and 6.6 s-1 were found. The electrocatalytic ability of the modified electrodes towards H2O2 electroreduction depends mainly on the formal potential of mediator. The MB-13X-CPEs and MG-13X-CPEs respond to H2O2 in the linear range from ~10-4 to 10-1 M. The best performances were attained with MB-13X-CPEs in phosphate buffer (pH 6): detection limit 0.13 mM, at a signal to noise ratio equal to 3; sensitivity 0.94 mA/M, calculated as the ratio Imax/KM.

 

Keywords: carbon paste electrodes; Methylene Blue; Methylene Green; Zeolite; Hydrogen peroxide
 
         
     
         
         
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