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vol.49 número1TEMPLATE SYNTHESIS OF 2,11-DIMETHYL-3,12-DIETHYL / PROPYL / PHENYL-1,4,10,13-TETRAAZACYCLOOCTADECA-1,3,10,12-TETRAENE COMPLEXES OF Mg(II), Ca(II), Sr(II) AND Ba(II)ON THE REDUCTION OF 4-OXO-4H-BENZOPYRAN-3-CARBALDEHYDES: GLOBAL AND LOCAL ELECTROPHILICITY PATTERNS‡ índice de autoresíndice de assuntospesquisa de artigos
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Journal of the Chilean Chemical Society

versão On-line ISSN 0717-9707

Resumo

ARADA PEREZ, MARÍA DE LOS A.; CORTES NODARSE, ISEL  e  YAZDANI-PEDRAM, MEHRDAD. CONSTRUCTION OF A POLYMERIC LIQUID-MEMBRANE ION-SELECTIVE ELECTRODE (ISE)AND ITS APPLICATION FOR DETERMINATION OF NITRATE IN TOMATOES. J. Chil. Chem. Soc. [online]. 2004, vol.49, n.1, pp.31-34. ISSN 0717-9707.  http://dx.doi.org/10.4067/S0717-97072004000100006.

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

Palavras-chave : ion-selective electrode (ISE); nitrate, tetra-decyl-ammonium nitrate; liquid membranes; plasticizer; poly(vinyl chloride).

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