Determination of Trace Tin by Anodic Stripping Voltammetry at a Carbon Paste Electrode

✍ Scribed by Yi-Heng Li; Hong-Qi Xie; Fang-Qin Zhou; Hui-Shi Guo

• Publisher: John Wiley and Sons
• Year: 2006
• Tongue: English
• Weight: 73 KB
• Volume: 18
• Category: Article
• ISSN: 1040-0397
• DOI: 10.1002/elan.200503484

✦ Synopsis

Abstract

A sensitive and selective procedure for the determination of trace tin at a carbon paste electrode was described. Each measurement cycle consisted of three steps: accumulation, reduction and stripping. The tin complex with bromopyrogallol red (BPR) was accumulated on the electrode surface in 0.10 mol/L acetate buffer (pH 4.5). After electrochemical reduction of Sn(II) had been carried out, the reoxidation wave of Sn(0) appeared at −0.69 V (vs. SCE) on scanning the potential in the positive direction in 4.0 mol/L HCl. For a preconcentration time of 2 min, the detection limit was 0.06 μg/L (5×10^−10^ mol/L ) and the linear range was from 0.1 to 50 μg/L. The proposed method was applied to the determination of tin in canned food and waste water samples with satisfactory results.