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Title: Determination of trace thallium after accumulation of thallium(III) at a 8-hydroxyquinoline-modified carbon paste electrode
Authors: Cai, Q.
Khoo, S.B. 
Keywords: 8-hydroxyquinoline
Differential pulse anodic stripping voltammetry
Human urine
Modified carbon paste electrode
Thallium(III) accumulation
Issue Date: 1995
Citation: Cai, Q.,Khoo, S.B. (1995). Determination of trace thallium after accumulation of thallium(III) at a 8-hydroxyquinoline-modified carbon paste electrode. The Analyst 120 (4) : 1047-1053. ScholarBank@NUS Repository.
Abstract: Thallium(III) was selectively accumulated, in an open circuit, from a stirred Britton-Robinson buffer solution (pH 4.56) onto a carbon paste electrode incorporating 8-hydroxyquinoline. The ensuing measurement was carried out by differential pulse anodic stripping voltammetry after reducing the thallium(III) to metallic thallium in ammonia-ammonium chloride buffer (pH 10.00). Factors affecting the accumulation, reduction and stripping steps were investigated and an optimized procedure was developed. Under optimized conditions, a calibration plot for thallium(III) concentration in the range 5.00 × 10-10-1.60 × 10-5 mol l-1 gave two linear regions arising from different controlling factors during the accumulation step. A detection limit of 2.30 × 10-10 mol l-1 (0.047 ppb) (S/N = 3) was found for a 2 min accumulation. For 10 successive determinations of 1.00 × 10-6 mol l-1 and 1.00 × 10-7 mol l-1 TlIII, relative standard deviations, sr, of 2.8 and 4.8% were obtained, respectively. Interferences from other ions and organic substances were examined. The developed method was applied to thallium determinations in sea-water and human urine samples.
Source Title: The Analyst
ISSN: 00032654
Appears in Collections:Staff Publications

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