Cyclic Polyamine Ionophore for Use in a Dibasic Phosphate-Selective Electrode

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...

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Bibliographic Details
Published in:Analytical chemistry (Washington) 1994-11, Vol.66 (21), p.3587-3591
Main Authors: Carey, Clifton M, Riggan, Wilson B
Format: Article
Language:English
Subjects:
Chemistry
Heterocyclic Compounds - chemistry
Hydrogen-Ion Concentration
Ion-Selective Electrodes - standards
Ionophores - chemistry
Ions
Magnetic Resonance Spectroscopy
Phosphates - chemistry
Polyamines - chemistry
Reference Standards
Spectrophotometry, Ultraviolet
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Summary: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.
ISSN:0003-2700
1520-6882
DOI:10.1021/ac00093a009