Resumo

VILTRES-PORTALES, Marcia et al. Preliminary study of the miniaturization of lead (II) ion selective electrode based on thiourea derivatives. Rev Cub Quim [online]. 2017, vol.29, n.3, pp.379-389. ISSN 2224-5421.

The present work reports the miniaturization of a solid-contact lead (II) ion selective electrode based on 1-benzoyl-3,3-diethylthiourea (BDE) as neutral carrier and tris-2-ethylhexilphosphate (TEHP) as mediator solvent in a polivynil chloride (PVC) matrix. Microelectrodes were prepared with glass capillaries of different diameters (2, 1 y 0,8 mm) and illustrates a good sensitivity to the metallic cation, with a slope close to a Nernstian logarithmic relationship for a divalent ion (29,53 mV/decade). Furthermore, the microelectrodes shows detection limits in order of 10-6 mol/L and a linearity range from 10-6 to 10-3 mol/L. These results are similar to reports for others sensors based on thiourea derivatives and even for commercial selective electrodes.

Palavras-chave : Lead(II)-ion selective microelectrodes; 1-benzoyl-3,3-diethylthiourea.

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