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Cyclic polyamine ionophore for use in a dibasic phosphate-selective electrode.

C M Carey·W B Riggan
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Abstract

A cyclic polyamine, 3-decyl-1,5,8-triazacyclodecane-2,4-dione (N3-cyclic amine), was used as the ionophore for a dibasic phosphate-selective electrode. This electrode exhibited a linear response between 1.0 mumol/L and 0.1 mol/L dibasic phosphate activity with a near-Nernstian slope of approximately -29 mV per activity decade. The electrode selectivity for dibasic phosphate over other commonly occurring anions was evaluated. A mechanism for the selectivity of the electrode toward HOP4(2-) ions is postulated to be a function of the size and charge of the N3-cyclic amine ionophore relative to the size and charge of HPO4(2-) ions. The electrode's superior selectivity and sensitivity make possible the direct measurement of phosphate activity in a wide variety of applications.

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Heterocyclic CompoundsHydrogen-Ion ConcentrationIon-Selective ElectrodesIonophoresMagnetic Resonance SpectroscopyPhosphatesPolyaminesReference StandardsSpectrophotometry, UltravioletJournal ArticleResearch Support, U.S. Gov't, P.H.S.

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C M Carey, W B Riggan. 1994-11-01. Cyclic polyamine ionophore for use in a dibasic phosphate-selective electrode.. https://doi.org/10.1021/ac00093a009

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