Determination of Trace Tin by Anodic Stripping Voltammetry at a Carbon Paste Electrode
- Resource Type
- Article
- Authors
- Li, Yi‐Heng; Xie, Hong‐Qi; Zhou, Fang‐Qin; Guo, Hui‐Shi
- Source
- Electroanalysis; May 2006, Vol. 18 Issue: 10 p976-980, 5p
- Subject
- Language
- ISSN
- 10400397; 15214109
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 (5×10−10mol/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.