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Journal of the Chilean Chemical Society

versão On-line ISSN 0717-9707

Resumo

ARADA PEREZ, MARÍA DE LOS ANGELES  e  YAZDANI-PEDRAM, MEHRDAD. POTENTIOMETRIC RESPONSE OF POLYMERIC LIQUID MEMBRANES BASED ON QUATERNARY AMMONIUM SALTS FOR NITRATE ION DETERMINATION. J. Chil. Chem. Soc. [online]. 2004, vol.49, n.3, pp.227-230. ISSN 0717-9707.  http://dx.doi.org/10.4067/S0717-97072004000300007.

Polymeric liquid membranes are prepared using (3-nitro-o-xylene (NOX), tri-butylphosphate (TBP), bis-(2-ethylhexyl) sebacate (DOS), o-nitrophenyloctyl ether (o-NPOE), tris-2-ethylhexylphosphate (TEHP), dioctylphthalate (DOP) and dibutylphthalate (DBP) as plasticizers, and they have been used as sensors for nitrate ion, employing tri-octylmethyl ammonium chloride (TOMACl) as ionosphere and poly(vinyl chloride) (PVC) as matrix. The sensors showed Nernstian slopes with values of the practical detection limit (PDL) and lower limit of linear response (LLLR) in the concentration range of 10-6 ­10-5mol/dm3. All the electrodes built showed a fast and stable response of 15 seconds. Wide working pH ranges, especially in the alkaline region, were observed. The response of the sensors was determined in relation to the lipophilicity of each plasticizer used as solvent-mediator, its dielectric constant (er), polarity and viscosity

Palavras-chave : ion-selective electrode; nitrate ion; tri-octylmethyl ammonium chloride; liquid membranes; poly(vinyl chloride).

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