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    STUDIA CHEMIA - Ediţia nr.1 din 2015  
         
  Articol:   DETERMINATION OF Cd(II) USING SQUARE WAVE ANODIC STRIPPING VOLTAMMETRY AT A CARBON PASTE ELECTRODE CONTAINING Bi-DOPED CARBON XEROGEL.

Autori:  GRAZIELLA LIANA TURDEAN.
 
       
         
  Rezumat:   A novel carbon paste electrode (CPE) modified with Bi-doped carbon xerogel (BiCXe) is presented as a promising alternative to electrode materials used to replace mercury electrode in detection of heavy metals ions from aqueous solutions. The ex situ preparation of BiCXe was realized by sol-gel technique involving a reaction between a mixture of organic compounds (resorcinol, formaldehyde, glycerol formal) and a bismuth salt (Bi(NO3)3.5 H2O) in the presence of a catalyst (NH4OH), followed by gel washing, drying and pyrolysis at 5500C/ 2h/ in inert atmosphere (Ar). Electrochemical investigation of BiCXe-CPE was performed by cyclic voltammetry (CV) and square wave voltammetry (SWV), and the detection of Cd (II) ions by square wave anodic stripping voltammetry (SWASV) in acetate buffer 0.1 M (pH = 4.5). The electroanalytical parameters of the new sensor were determined. The favourable performance of the novel electrode coupled with the mercury-free surface make this sensor very attractive for environmental monitoring of toxic Cd(II) ions.

Keywords: carbon paste electrode; Bi-doped carbon xerogel; Cd(II) detection; square wave voltammetry; anodic stripping;
 
         
     
         
         
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