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- E-ISSN 2288-8985
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- P-ISSN1225-0163
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Determination of Complex Formation Constant of Sodium-Selective Ionophores in Solvent Polymeric Membranes
Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
2000, v.13 no.4, pp.466-473
Kang,
T. Y., Kim,
S. B., Oh,
H. J., Han,
S. H., Cha,
G. S., &
Nam,
H.
(2000). Determination of Complex Formation Constant of Sodium-Selective Ionophores in Solvent Polymeric Membranes. Analytical Science and Technology, 13(4), 466-473.
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Abstract
The complex formation constants (<TEX>${\beta}_{MLn}$</TEX>) of potassium and various sodium-selective neutral carriers in solvent polymeric membranes have been determined using solvent polymeric membrane-based optodes and ion-selective electrodes (ISEs). Two different types of PVC-based membranes containing the H^+selective chromoionophore (ETH 5294) with and without a sodium ionophore (4-tert-bntylcalix[4]arenetetraacetic acid tetraethyl ester, ETH 2120, bis[(12-crown-4)methyl] dodecylmethylmalonate or monensin methyl ester) were prepared and their optical responses to either the changes in alkali metal cation (e.g., sodium and potassium) concentrations at a fixed pH (0.05 M Tris-HCl, pH 7.2) or varying pH at a fixed alkali metal cation concentration (0.1 M) were measured. The same type of membranes were also mounted in conventional electrode body and their potentiometric responses to varying pH at a fixed alkali metal cation concentration (0.1 M) were measured. The complex formation constants of the ligand could be calculated from the calibration plots of the relative absorbance vs. the activity ratios of cation and proton (<TEX>$a_{M^+}/a_{H^+}$</TEX>) and of the emf vs. pH. It was confirmed that the ratio values of the complex formation constants for the primary and interfering ions are closely related to the experimental selectivity coefficients of ISEs.
- keywords
- complex formation constant, sodium ionophore, optode, ion-selective electrode
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