Silver disk microelectrode

Silver disk microelectrode and differential pulse voltammetry can be used successfully for trace level iodine determination in tap water samples. According to Fang and coworkers [76], the mixture of 4 cm acetate buffer (pH 5), 1 cm 1 M EDTA solution, and 5 cm water sample are separated, after the silver working electrode is preconditioned by cycling between +0.1 and 0.6 V. A 1 min electrolysis time follows and the differential stripping pulse voltammetry step is performed with 50 mV pulse amplitude. The peak at —0.32 V is evaluated. A calibration graph, which is linear in the range of 50 nM—1.2 xM is used for the evaluation. 

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