A simple and rapid complexometric determination of thallium(III) using mercaptoethane as demasking agent

Prakash Shetty, A. Nityananda Shetty

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

A simple, rapid and selective complexometric method is proposed for the determination of thallium(III), using mercaptoethane(EtSH) as demasking agent. The sample solution containing Tl(III) is first complexed with excess EDTA and the surplus EDTA is removed by titration at pH 5-6 with zinc sulphate solution using xylenol orange as indicator. EtSH solution is then added to displace EDTA selectively from Tl-EDTA complex. Thallium is determined indirectly by titration of released EDTA with zinc sulphate solution. Reproducible and accurate results are obtained in the concentration range 4-80 mg of thallium with a relative error ≤ ±0.6% and relative standard deviation ≤0.7%. The method is successfully applied to the determination of Tl(III) in its synthetic alloy compositions and complexes, and waste-water samples.

Original languageEnglish
Pages (from-to)97-100
Number of pages4
JournalSouth African Journal of Chemistry
Volume59
Publication statusPublished - 13-09-2006

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Thallium
Edetic Acid
Zinc Sulfate
Titration
Wastewater
Chemical analysis

All Science Journal Classification (ASJC) codes

  • Chemistry(all)

Cite this

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abstract = "A simple, rapid and selective complexometric method is proposed for the determination of thallium(III), using mercaptoethane(EtSH) as demasking agent. The sample solution containing Tl(III) is first complexed with excess EDTA and the surplus EDTA is removed by titration at pH 5-6 with zinc sulphate solution using xylenol orange as indicator. EtSH solution is then added to displace EDTA selectively from Tl-EDTA complex. Thallium is determined indirectly by titration of released EDTA with zinc sulphate solution. Reproducible and accurate results are obtained in the concentration range 4-80 mg of thallium with a relative error ≤ ±0.6{\%} and relative standard deviation ≤0.7{\%}. The method is successfully applied to the determination of Tl(III) in its synthetic alloy compositions and complexes, and waste-water samples.",
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A simple and rapid complexometric determination of thallium(III) using mercaptoethane as demasking agent. / Shetty, Prakash; Shetty, A. Nityananda.

In: South African Journal of Chemistry, Vol. 59, 13.09.2006, p. 97-100.

Research output: Contribution to journalArticle

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