Simultaneous Determination of Indium and Thallium Ions by Anodic Stripping Voltammetry Using Antimony Film Electrode
Abstract:An antimony film electrode (SbFE) was employed for the simultaneous determination of trace level of indium (In3+) and thallium (Tl+) ions in non-deaerated aqueous solutions by square-wave anodic stripping voltammetry (SWASV). The SbFE yielded well-defined and separated stripping peaks for these ions with low background contribution, after a short deposition time. Several key factors affecting the response signal of In3+ and Tl+ ions such as pH of the supporting electrolyte, deposition potential, and deposition time have been optimized. The lower detection limits obtained for Tl+ and In3+ ions were 2 and 8 g/L, respectively. A good reproducibility with relative standard deviation of 3.8% and 2.8% for 70 g/L Tl+ and In3+ ions was obtained (n = 10). The SbFE displayed linear calibrations in the concentration range from 20 to 100 g/L In3+ and Tl+ ions. The proposed method was successfully applied to the analysis of In3+ and Tl+ ions in river water and tap water.
Document Type: Research Article
Publication date: 2009-08-01
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