Abstract
An adsorptive stripping voltammetry method for the determination of iron has been developed. The procedure is based on the adsorptive collection of a complex of iron with 1-(2-piridylazo)-2-naphthol (PAN) on a bismuth-coated glassy carbon electrode (BiFE). Factors affecting the stripping performance, such as pH, PAN concentration ( C PAN), potential, accumulation time ( E ads, t ads), and interference by other ions were also studied. The optimum conditions were obtained in a 0.1 mol L −1 acetate buffer at pH 4.0, C PAN 5.0 μmol L −1, t ads 60 s, E ads −400 mV, pulse height 4.0 mV, pulse amplitude 25 mV, and frequency 15 Hz. The detection limit was found to be 0.1 μg L −1 when a t ads of 60 s was used, and the linear range was from 0.4 to 60.0 μg L −1. The proposed procedure was validated by determining of Fe(III) in CRM-MFD, QCS-19 and CRM-SW certified reference materials and applied in seawater samples with satisfactory results.
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