Resumo

ARADA-PEREZ, María de los Ángeles  e  NAPOLES-FLORIAN, Karel Yasmany. A new potentiometric sensor for nitrate using diethylphthalate (DEP) as plasticizer and triocthylmethylammonium chloride (TOMACl) as ionophore. Rev Cub Quim [online]. 2018, vol.30, n.2, pp. 277-288. ISSN 2224-5421.

In this work, a potentiometric sensor for nitrate using diethylphthalate (DEP) as plasticizer, triocthylmethylammonium chloride (TOMACl) as ionophore and poly (vinylchloride) (PVC) as matrix is valued. Some parameters of evaluation of the electrode are presented: slope (S), practical detection limit (PDL), lower limit of linear response (LLLR), lifetime, influence of the pH on the response of the electrode and the potentiometric selectivity coefficients (K_AB^POT). The constructed electrode exhibited a Nernstian response to NO_3- over a wide concentration range (10^-6 to 10^-2 mol·dm^-3), with a slope of -70,71 ± 1,05 mV/dec. It showed a fast response time (20 s). The electrode showed a good performance in the pH range 3 - 9 and lifetime of 2 - 2,5 months. The selectivity coefficients for various ions were calculated.

Palavras-chave : Ion Selective Electrode (ISE); Triocthylmethylammonium Chloride (TOMACl); Diethilphthalate (DEP); Selectivity Coefficient.

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