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In the tests, the differential pulse voltammogram showed a reproducible iodate peak at a peak potential of -1.03 V versus the Ag/AgCl/KCl (3 mol/L reference electrode. Iodide concentrations have been analyzed by both the calibration curve and the standard addition technique. However, in terms of matrix effects and feasibility – calibration curves have to be daily registered – we favour the standard addition technique. The method is linear over three orders of magnitude and neither high salt nor bromine contents interfere with the iodide determination.
The described differential pulse voltammetric method for the determination of iodide in brine has significant advantages over other commonly employed methods. Besides the excellent price-performance ratio, the voltammetric iodide determination excels by its sensitivity, selectivity and high degree of matrix independence. Download the technical poster here.
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