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Determination of Trace Tin by Anodic Stripping Voltammetry at a Carbon Paste Electrode
Author(s) -
Li YiHeng,
Xie HongQi,
Zhou FangQin,
Guo HuiShi
Publication year - 2006
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.200503484
Subject(s) - tin , anodic stripping voltammetry , detection limit , stripping (fiber) , electrode , electrochemistry , chemistry , analytical chemistry (journal) , carbon paste electrode , trace amounts , carbon fibers , voltammetry , materials science , nuclear chemistry , inorganic chemistry , cyclic voltammetry , chromatography , metallurgy , medicine , alternative medicine , composite material , pathology , composite number
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.