Development of Rotating Liquid Membrane Disk Electrode and Rotating Liquid Membrane Ring-Liquid Membrane Disk Electrode and Evaluation of Characteristics of Ion Transfer Reactions at the Rotating AqueouslOrganic Solution Interface

Abstract

A liquid membrane disk electrode, LMDE, and a liquid membrane ring-liquid membrane disk electrode, LMRE-LMDE, were developed by placing a gelled polyvinyl chloride thin membrane impregnated with 2-nitrophenyl octyl ether, NPOE-LM, on the surface of a glassy carbon, GC, disk or ring electrode. The voltammogram for the ion transfer at the interface between an aqueous solution, W, and NPOE-LM was recorded by setting the developed electrode in W and rotating at a rate, ω, between 0 and 4000 rpm. The sensitivity of the ion-transfer current at the W|NPOE-LM interface, I, was enhanced to be more than 100 times better than that at the W|NPOE (solution) interface when LMDE was rotated at ω higher than 200 rpm. The reversibility of the ion transfer reaction could be evaluated based on the dependence of I on ω of LMDE, and the reaction product at LMDE could be identified at LMRE when the rotating LMRE-LMDE system was adopted.

Stripping Analysis of Nanomolar Perchlorate in Drinking Water with a Voltammetric Ion-Selective Electrode Based on Thin-Layer Liquid Membrane

“…After this preconcentration step, the potential is swept to the cathodic direction such that the reduction of the oxidized POT film is coupled with stripping of the concentrated perchlorate molecules from the membrane phase into the aqueous sample to obtain the enhanced ionic current response (Figure 1b). In comparison to previous studies by us 26,29 and others, [30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45] the thinner liquid membrane spin-coated on a solid support serves as the first thin-layer cell for ion-transfer stripping voltammetry to maximize the stripping current response by the total exhaustion of the preconcentrated perchlorate molecules from the membrane. Theoretical models are developed and validated experimentally to assess the diffusion and preconcentration of perchlorate in the thinlayer liquid membrane.…”

Hydrodynamic voltammetry at the liquid–liquid interface: Application to the transfer of ionised drug molecules

“…Similar approaches investigating tetraethylammonium transfer in a rotating L/L system, separated by a poly(ethylene terephthalate) (PET) membranes have been reported previously from this laboratory [26,41]. Most recently, Fujii et al developed a technique where rotating liquid membrane disc electrode is used to study ion transfer across water/nitrophenyl octyl ether interface [42]. The use of PVDF membranes was driven by their use in industrial permeability assays [27].…”

Stripping Voltammetry at the Interface between two Immiscible Electrolyte Solutions: A Review Paper

“…NPOE is a solvent widely used to study ion transfer at a liquid/liquid interface, kinetically extract drugs, and enable ion transfer across supported liquid membranes . The most common organic phase to study the lipophilicity of drugs was DCE, used as an aprotic solvent .…”