Construction of a New Aluminum(III) Cation Selective Electrode Based on 12-Crown-4 as an Ionophore

• Autor(a) principal: Esmaelpourfarkhani,Masoomeh
• Data de Publicação: 2015
• Outros Autores: Rounaghi,Gholam H., Arbab-Zavar,Mohammad H.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Journal of the Brazilian Chemical Society (Online)
• Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532015000500963
• topic: aluminum(III) cation; 12-crown-4; ion-selective electrode; potentiometry

This article describes the fabrication of a novel and selective polyvinylchloride (PVC) membrane potentiometric sensor for Al3+ cation based on 12-crown-4 (12C4) as an ionophore. The electrode was prepared by coating the surface of a graphite rod by a membrane containing PVC as a plastic matrix, dibutylphthalate (DBP) as plasticizer, 12C4 as an ionophore and oleic acid (OA) as an additive. Under optimized membrane composition, the constructed electrochemical sensor exhibited a Nernstian response for Al3+ cation concentration, ranging from 1.0 × 10-6 to 1.0 × 10-1mol L-1with a detection limit of 5.5 × 10-7mol L-1 and a slope of 19.0 ± 0.4 mV per decade at 25 °C. The constructed potentiometric sensor showed a relatively fast response time (15 s), good reproducibility and stability, and high selectivity towards Al3+ cation in solutions. The proposed sensor was successfully used as an indicator electrode in potentiometric titration and also in the direct determination of this metal cation in real samples.