Applicability of antimony film electrodes in anodic stripping voltammetry combined with sequential injection analysis

Abstract

The possibilities to employ antimony-film plated glassy carbon electrode (SbFGCE) in anodic stripping voltammetry combined with sequential injection analysis(ASV-SIA) were examined and tested for the determination of Pb(II) and Cd(II) selected as the model ions. It has been found that SbF-GCE can be operated at the low :g l–1 concentration level via the in-situ preparation — deposition from a plating solution of 0.5 M HCl, mixed with 0.75 mg l–1 Sb(III), and at a potential of –1.5 V vs. Ag/AgCl. The same solution could then be used for pre-concentration and stripping, when the reproducibility of the respective signals was characterised 20 Guzsvány V. et al./Sci. Pap. Univ. Pardubice Ser. A 16 (2010) 19–31 by means of the RSD < 2.8 %, and the detection limit (3F) of about 1.2 μg l–1 Pb(II) and 1.4 μg l-–1 Cd(II). Furthermore, as found, the presence of weakly complexing halide salts, KCl or KBr, could further improve the overall signal-tonoise ratio, whereas the addition of KSCN into the solution(s) offered the possibility to detect some additional ions; namely, of highly electronegative metal elements such as Zn(II), Mn(II), and Cr(III).