STATIC AND FLOW-INJECTION VOLTAMMETRIC DETERMINATION OF PERIODATE BY REDUCTION AT A ROTATING PLATINUM WIRE ELECTRODE

A method for periodate determination was developed as a result of stat ic and flow-injection voltammetric investigations where a rotating pla tinum wire electrode was employed. In the static system, 4.0 X 10(-5)- 4.2 x 10(-4) M periodate could be determined in the cell in pH 7.0-7.5 phosphate buffer. In the flow-injection system, periodate solutions o f 20-100 mu l were injected into the carrier stream of a phosphate buf fer solution at pH 7.0. The flow rates were in the range of 1.0-1.7 ml min(-1). The peak currents were measured at -0.07 V against a saturat ed calomel electrode. The determination of periodate concentrations in the range 1.0 X 10(-5)-1.0 X 10(-4) M was possible with a throughput of 15-40 samples per hour.