Construction of a polymeric liquid-membrane ion-selective electrode (ise)and its application for determination of nitrate in tomatoes

• MARÍA DE LOS A. ARADA PÉREZ ^[1] ; ISEL CORTES NODARSE ^[2] ; MEHRDAD YAZDANI-PEDRAM ^[3]
  1. [1] Universidad de Oriente

     Universidad de Oriente

     Venezuela

     
  2. [2] Universidad de La Habana

     Universidad de La Habana

     Cuba

     
  3. [3] Universidad de Chile

     Universidad de Chile

     Santiago, Chile

     

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• Localización: Journal of the Chilean Chemical Society (Boletín de la Sociedad Chilena de Química), ISSN-e 0717-6309, ISSN 0366-1644, Vol. 49, Nº. 1, 2004, págs. 31-34
• Idioma: inglés
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• Resumen

  • A potentiometric all-solid-state type ion-selective electrode (ISE) for NO3- was constructed and characterized. It is based on a mixture of tetra-decyl-ammonium nitrate (TDAN) as ionophore, di-butyl phthalate (DBP) as plasticizer and poly (vinyl chloride) (PVC) as matrix. Nitrate concentrations in tomatoes samples, randomly collected from central market at Santiago de Cuba, were determined using the described ISE by standard addition potentiometry. Spectrophotometric determinations using Brucine were performed as comparative method. Accurate and precise results were obtained. Accordingly, an analytical procedure for NO3- determination in tomatoes using the constructed ISE could be formulated