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    STUDIA CHEMIA - Issue no. 3 / 2007  
         
  Article:   INVESTIGATION OF MICELLAR PROPERTIES OF ANIONIC SURFACTANTS WITH THE AID OF PVC-MEMBRANE DODECYL SULFATE ELECTRODE.

Authors:  SIMONA ANTOANELA GAVAN, DAN FLORIN ANGHEL. 		 
       
         
  Abstract:  A polymer matrix electrode selective to anionic surfactants has been proposed. The active matter of the electrode was the dodecyltrimethylammonium dodecyl sulfate ion-pair. The matrix was made of high-molecular weight poly(vinyl chloride) (PVC) plastified with 2-nitrophenyl octyl ether. The electrode had Nernstian response with a slope of 57.3 ± 0.2 mV per decade over a range of dodecyl sulfate concentration from 3.5 x 10-6 to 6.0 x 10-3 M, and a detection limit of 2.2 x 10-6 M. The electrode was very selective towards inorganic interfering anions. Among the organic anions only those with surfactant properties did interfere. The working pH of the electrode was in the 3.0 - 13.0 range. The electrode was used to determine the critical micelle concentration (CMC) of sodium dodecyl sulfate (SDS) in the absence and presence of water-soluble organic additives and of inorganic electrolytes.  
         
     
         
         
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