Anodic differential pulse voltammetric analysis of iodide with a cinchonine‐modified carbon paste electrode

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Abstract
The stripping voltammetric determination of iodide ions has been completed using a cinchonine modified carbon paste electrode. Iodide ions were deposited onto a carbon paste electrode containing cinchonine via the ion pairing reaction in an acidic medium. The oxidation peak potential of the iodide ion is + 0.65 V. The analytical conditions for the determination of the iodide ion were optimized by cyclic voltammetry. The optimal composition of CMCPE and pH of the solution on the deposition of iodide are 40%(w/w) and 2.15, respectively. Differential pulse voltammetry was applied to determine the calibration plot and detection limit. The detection limit was 8.0 × 10−8M for 20 min of deposition time and relative standard deviation (5 determinations) was ±4.2% at a 7.0 × 10−7M iodide solution. The interferences of anions and cations were investigated. The thiosulfate ion interferes with the oxidation current of the iodide ion by about 12%. C1−, Br−, SCN−, C2O42−, CIO4−, NO3Co2+Fe(CN)63−, Ni2+, Cu2+, Cd2+, Pb2+, and Hg2+do not interfere with the determination for the iodide ion. The applicability of the CMCPE to the determination of iodide in a disinfectant has also been investigated.

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