Indirect complexometric determination of thallium(III) using thioglycolic acid as masking agent

Prakash Shetty, A. Nityananda Shetty, R. V. Gadag

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Abstract

A simple and selective complexometric method for the determination of thallium(III) is proposed by using thioglycolic acid as a masking agent. In the presence of diverse metal ions thallium(III) is complexed with excess EDTA and the surplus EDTA is back titrated (pH 5 - 6 , hexamine) with standard zinc sulphate solution using xylenol orange indicator. A freshly prepared 1% aqueous solution of thioglycolic acid is then added to displace EDTA from Tl(III)-EDTA complex and the released EDTA is titrated with standard zinc sulphate solution. The results for the determination of 4 - 87 mg of thallium are obtained with a relative error of 0.3% and coefficient of variation 0.46%. The effect of diverse ions are studied. The method is applied to the determination of thallium in its complexes and synthetic mixtures.

Original languageEnglish
Pages (from-to)227-229
Number of pages3
JournalIndian Journal of Chemical Technology
Volume7
Issue number5
Publication statusPublished - 01-09-2000

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All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Chemistry (miscellaneous)

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