Amperometric detection of the ammonium ion by facilitated ion transfer across the interface between two immiscible electrolyte solutions

Abstract

Facilitated ion transfer reactions of the ammonium, potassium, and sodium ions with the ionophores dibenzo-18-crown-6, nonactin, and valinomycin were investigated at the water/ 1,2-dichloroethane interface. Association constants for the various reactions studied were calculated to determine the selectivity imparted by the ionophores on the transferring ions. Of the ionophores studied, nonactin was found to be the most selective towards the ammonium ion, with a calculated association constant of 14.1.

Transfer Mechanism of Ionic Drugs: Piroxicam as an agent facilitating proton transfer

“…In analogy with ion-transfer reactions facilitated by ionophores [18][19][20][21][22][23][24], proton transfer mediated by either electroneutral or ionized ionophores [3 1-34] has been reported in the literature. These studies show that both the pH of the aqueous phase and ionophore concentration in the organic phase influence the nature and type of the facilitated ion-transfer reaction.…”

Effect of ligand protonation on the facilitated ion transfer reactions across oil|water interfaces. III. Digital simulation and experimental approach

“…Aqueous and organic phases were equilibrated by mechanical shaking of an aqueous volume (V w ) and an organic volume (V o ) until a thermodynamic equilibrium was reached. We used for all the experiments a volume ratio value V w V o equal to 9.0. n ¼ ½D o species ðD w species Þ À1 1 2 is fixed at 1.12 on the basis of the WaldenÕs rule where 1,2-dichloroethane is the organic solvent [43].…”

Electrochemical Behavior and Detection of Diclofenac at a Microporous Si3N4 Membrane Modified Water–1,6-dichlorohexane Interface System

“…Using standard thermodynamic values of well-known reference ions such as TMA + to determine the thermodynamic properties of an unknown ion transfer is one of the classical methods via liquid-liquid interface [60]. By converting the obtained experimental value to the Galvani potential scale, the value of the formal transfer potential of an ionized drug is obtained as given by the following expression [56,61].…”