Abstract

The response of platinum and gold microdisc electrodes, radii 1–63 μm, and gold microband electrodes, thickness 12 μm, to low concentrations of chlorine in neutral aqueous phosphate buffer is described. Current-potential curves for chlorine at such electrodes show well shaped reduction waves. For quantitative analysis, the chronoamperometric response is recommended and a good linear relationship between current and chlorine concentration is found for the range 0.1–1 mg l −1 chlorine at both microdisc and microband electrodes; the phosphate buffer concentration may be as low as 0.5 mM without the addition of other electrolytes. Moreover, within the normal operating range, the response is not dependent on solution flow-rate. The development of a sensor based on these concepts is discussed.

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