Voltammetric determination of phosphate and other species

During a preliminary study of the use of oxidation of molybdenum blue at a glassy carbon electrode to determine phosphate. Molybdophosphate itself was shown to be reduced at a positive potential. Combined cathodic-anodic peaks were obtained by scanning in the positive potential direction. Differential-pulse voltammetric procedures for the determination of phosphate were developed based on positive-going potential scans for both molybdophosphate and molybdenum blue. Optimised procedures are described for determining orthophosphate. [Continues.]