Flow injection voltammetric determination of phosphate: direct injection of phosphate into molybdate reagent

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Abstract
Phosphate can be determined precisely as molybdophosphate by flow injection analysis using a glassy carbon electrode as a voltammetric detector. The sample solution (25 µl, 1 × 10–6–5 × 10–4 M in phosphate) is injected into an eluent which is 2%m/V in ammonium molybdate and 0.6%V/V in concentrated sulphuric acid. Molybdophosphate, which is determined by reduction at the glassy carbon electrode, is fully formed when a 3-m delay coil (0.58 mm i.d.) is incorporated before the detector and a flow-rate of 4 ml min–1 is used.

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