A phosphate ion-selective electrode using molybdenum metal was constructed. The modified molybdenum electrode responded to HPO in the presence of molybdenum dioxide and molybdophosphate (PMoO) on the surface. The electrode exhibited a linear response to HPO in the concentration range between 1.0 × 10 and 1.0 × 10 M (mol dm) in the pH range from 8.0 to 9.5 with a detection limit of 1.0 × 10 M. The sensor showed near Nernstian characteristics (27.8 ± 0.5 mV dec) at pH 9.0. Since the responding potential was attributed to the activity of HPO, the potential at a given concentration of phosphate depended on the pH. The electrode indicated a good selectivity with respect to other common anions such as NO, SO, Cl, HCO and CHCOO. The modified molybdenum electrode can be continuously used for over a 1 month with good reproducibility. The feasibility of the electrochemical sensor was proved by successful for the detection of phosphate in real samples.
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