Carey C M, Riggan W B
American Dental Association Health Foundation, Paffenbarger Research Center, National Institute of Standards and Technology, Gaithersburg, Maryland 20899.
Anal Chem. 1994 Nov 1;66(21):3587-91. doi: 10.1021/ac00093a009.
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.
一种环状多胺，3-癸基-1,5,8-三氮杂环癸烷-2,4-二酮（N3-环状胺），被用作磷酸氢盐选择性电极的离子载体。该电极在1.0 μmol/L至0.1 mol/L的磷酸氢盐活性之间呈现线性响应，每活性 decade 的斜率接近能斯特斜率，约为 -29 mV。评估了该电极对磷酸氢盐相对于其他常见阴离子的选择性。推测该电极对HPO4(2-)离子选择性的机制是N3-环状胺离子载体的大小和电荷相对于HPO4(2-)离子的大小和电荷的函数。该电极卓越的选择性和灵敏度使得在多种应用中直接测量磷酸盐活性成为可能。
