An ion-selective electrode (ISE) for monohydrogen phosphate, based on a dispersion of Mg/Al hydrotalcite- like compound particles into a polymeric membrane of polyvinyl butyral, in the coated-wire configuration, is described. The inorganic ionophore was ad hoc synthesized and characterized. The electrode showed a Nernstian response towards monohydrogen phosphate independently from the pH of the solution in the range 4.5–7.8 with a linearity range from 5.0 10-5 to 2.0 10-2 M and a limit of detection of 3.0 10-5 M. The response time varied from 10 to 25 s. Potentiometric selectivity coefficients for the proposed sensor were evaluated over several mono- and divalent anions, chosen among the most common ones. The results pointed out a reasonably good selectivity for monohydrogen phosphate. A successful application of the developed ISE for phosphate determination in hydroxyapatite samples using direct potentiometry is presented.
D.Tonelli, S. Ghorbel, M. Colombari, L. Guadagnini, A. Ghorbel (2013). Monohydrogen phosphate selective electrode based on a synthetic hydrotalcite. JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 690, 25-31 [10.1016/j.jelechem.2012.11.039].
Monohydrogen phosphate selective electrode based on a synthetic hydrotalcite
TONELLI, DOMENICA;GUADAGNINI, LORELLA;
2013
Abstract
An ion-selective electrode (ISE) for monohydrogen phosphate, based on a dispersion of Mg/Al hydrotalcite- like compound particles into a polymeric membrane of polyvinyl butyral, in the coated-wire configuration, is described. The inorganic ionophore was ad hoc synthesized and characterized. The electrode showed a Nernstian response towards monohydrogen phosphate independently from the pH of the solution in the range 4.5–7.8 with a linearity range from 5.0 10-5 to 2.0 10-2 M and a limit of detection of 3.0 10-5 M. The response time varied from 10 to 25 s. Potentiometric selectivity coefficients for the proposed sensor were evaluated over several mono- and divalent anions, chosen among the most common ones. The results pointed out a reasonably good selectivity for monohydrogen phosphate. A successful application of the developed ISE for phosphate determination in hydroxyapatite samples using direct potentiometry is presented.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
