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    STUDIA CHEMIA - Issue no. 3 / 2009  
         
  Article:   PVC MATRX IONIC - SURFACTANT SELECTIVE ELECTRODES BASED ON THE IONIC PAIR TETRA ALKYL-AMMONIUM -LAURYLSULPHATE.

Authors:  CRISTINA MIHALI, GABRIELA OPREA, ELENA CICAL.
 
       
         
  Abstract:  

A series of all-solid-state electrodes sensible to the anionic surfactants were developed using silver pills coated with PVC membranes. We used cetyltrimethylammonium laurylsulfate (CTMA-LS) and tricapryl-methylammonium laurylsulfate (TCMA-LS) as electroactive matter (ionophore) and different plasticizers. The electrochemical properties of the electrodes were studied. The best electrochemical characteristics were obtained with TCMA-LS (dioctylsebaccate as plasticizer): nearnerstinan slope: 58,56 mV/pC; concentration range of linear response 10-3-2x10-6 M∙L-1 of laurylsulfate anion. The selected membrane-electrode can be applied as equivalence point indicator to the potentiometric titration of anionic surfactants and to the determination of anionic surfactants in environmental samples.

  

Keywords: anionic surfactant-selective electrode; PVC - matrix membrane electrodes, sodium laurylsulfate

 
         
     
         
         
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