Determination of trace heavy Metals by Sequential Injection-anodic Stripping Voltammetry using Bismuth Film Screen-printed Carbon Electrode
Tóm tắt
A sequential injection-square-wave anodic stripping voltammetry (SIA-SWASV) is proposed for the simultaneous determination of Pb(II), Cd(II) and Zn(II), employing an in situ plated bismuth film screen-printed carbon electrode (Bi-SPCE) as a working electrode and hydrochloric acid as a supporting electrolyte. Bi(III) and analyte metal ions were on-line deposited onto a SPCE at −1.4 V vs. Ag/AgCl for 180 s. At a stopped flow, a square-wave voltammogram was recorded from–1.3 to 0 V vs. Ag/AgCl. The experimental conditions were optimized. Under the optimum conditions, the linear ranges were 0–70 mg L−1 for Pb(II) and Cd(II), and 75–200 mg L−1 for Zn(II). The limits of detection (S/N = 3) were obtained at concentrations as low as 0.89 mg L−1 for Pb(II) and 0.69 mg L−1 for Cd(II) for a 180-s deposition time. The proposed method was applied to the determination of Pb(II), Cd(II) and Zn(II) in water samples with satisfactory results.
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