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Updated: Jun 28, 2026

Ion-Exchange Membranes for the Fabrication of Reverse Electrodialysis Device
Published on: July 20, 2021
Use of self-plasticizing EVA membrane for potentiometric anion detection
K Y Torres1, C A Garcia, J C Fernandes
1Instituto de Quimica - UNICAMP, P.O. 6154, 13083-970 Campinas, SP, Brazil.
Abstract:
In this work, five different types of membranes were developed responsible to anion-selective electrodes. The membranes were based on tri-caprylyl-trimethyl-ammonium chloride (Aliquat-336S) supported on poly(ethylene-co-vinyl-acetate) copolymer (EVA). The sensors were prepared by solubilizing the copolymer with the appropriate exchanger in chloroform, without using of any plasticizers. The ion-selective electrodes prepared using these membranes show the utility for anions determinations in the concentration range between 10(-5) and 10(-1) mol l(-1) in the steady-state. The membrane performance was also evaluated in FIA system using tubular electrode for salicylate and iodide. In FIA system, the electrode exhibited nernstian response for salicylate in the concentration range of 2.5x10(-3) and 1.0x10(-1), while for iodide from 5.0x10(-4) up to 1.0x10(-1) mol l(-1). The systems were employed for the salicylate and iodide determination in pharmaceutical samples obtaining a relative deviation of 1.6%, when compared to the reference method.
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