Use of a Boron-Doped Diamond Electrode for Amperometric Assay of Bromide and Iodide Ions
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The electrochemical assay of bromide and iodide ions at boron-doped diamond (BDD) electrode was investigated by cyclic voltammetry (CV) and chronoamperometry (CA). Comparison experiments were carried out using a glassy carbon (GC) electrode. The BDD electrode exhibited well-resolved and irreversible reduction voltammograms, while the GC electrode provided only an ill-defined response. Cyclic voltammetric signals at BDD electrode for 10 mM Br− and I− were observed at 561 and 125 mV vs. SCE; the values shifted negatively for 228.7 and 187.5 mV, respectively, compared to those at GC electrode. It was also found that the peak current of Br− and I− was in direct proportion to the scan rate, which is indicative of a surface confined reduction process. Sensitive amperometric responses for Br− and I− were obtained covering the linear ranges 0.666 µM–1 mM and 13.3 nM–1 mM, respectively, and their detection limits were 0.53 µM and 1.67 nM, respectively, under the optimum pH and applied potential. The amperometric response was very reproducible and stable with satisfactory recovery results.
KeywordsCyclic Voltammetry Glassy Carbon Glassy Carbon Electrode Reduction Process Comparison Experiment
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