ELSEVIER Analytica Chimica Acta 292 (1994) 99-105 Static and flow-injection voltammetric determination of periodate by reduction at a rotating platinum wire electrode H.i. Giikqel ‘, G. Niqli b** ’ zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA Chemical Engineering Department, Faculty of Engineering b Chemists Department, Faculty of Science, Ege Univemi@ , 35100 kmir, Turkey (Received 24th September 1993; revised manuscript received 20th December 1993) AbStraet A method for periodate determination was developed as a result of static and flow-injection voltammetric investigations where a rotating platinum wire electrode was employed. In the static system, 4.0 X lo-‘-4.2 x 10m4 M periodate could be determined in the cell in pH 7.0-7.5 phosphate buffer. In the flow-injection system, periodate solutions of 20-100 pl were injected into the carrier stream of a phosphate buffer solution at pH 7.0. The flow rates were in the range of 1.0-1.7 ml min -I. The peak currents were measured at -0.07 V against a saturated calomel electrode. The determination of periodate concentrations in the range 1.0 X lo-‘-1.0 X 10m4 M was possible with a throughput of 15-40 samples per hour. Key words: How injection; Voltammetry; Periodate 1. zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA Introduction Periodate is used as a strong and selective oxidant for the determination vicinal polyhydroxy compounds such as carbohydrates and polyols [l]. Quantitation of these compounds depends on either the determination of the oxidation prod- ucts of the organic compounds, the measurement of IO; formed or of the excess of IO,. The kinetics and mechanism of oxidation path- ways of such compounds have also been de- scribed, and were determined by means of spec- * Corresponding author. trophotometric and/or titrimetric methods 12-71. The determination of such compounds could also be based on the detection of periodate by spectrophotometric methods [8-121 or by electro- metric methods, employing a periodate-selective electrode or measuring the polarographic reduc- tion current of periodate [13-161. In recent years, continuous-flow and flow-injection techniques have been employed in the periodate oxidation methods [17-211. In the present article, the behaviour of perio- date at a rotating platinum wire electrode (RPWE) was studied as a function of pH and concentration of periodate in a static system. The developed voltammetric procedure was then ap- plied to the flow-injection amperometric determi- ooO3-2670/94/$07.00 Q 1994 Elsevier Science B.V. All rights reserved SSDI 0003-2670(94)00034-J