Abstract
Measurement of the exact concentration of bromide in seawater, usually present at the ca milli-Molar level, is significant for evaluating geological, biological and environmental conditions. Although silver electrodes are commonly used for amperometric halide measurements, providing selectivity for the ions with similar concentrations, the bromide signal obtained in seawater is masked by that of chloride at hundred millimolar levels. Thus, an alternative bespoke reagent-free electrochemical bromide sensor for seawater was developed with the benefits of low cost, simplicity and rapidity. This is based on the voltammetric oxidation of bromide at Pt macro-electrode, which results in a well-defined signal that is separated from the chloride oxidation peak in seawater. The sensitive quantification was performed by square wave voltammetry combined with the standard addition method, which was evidenced to be valid in both artificial seawater and authentic natural seawater. The measured bromide concentrations of three real samples show good agreement with the results obtained by ion chromatography.
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