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

Shetty, Prakash and Shetty, Nityananda A and Gadag, R V (2000) Indirect complexometric determination of thallium(III) using thioglycolic acid as masking agent. Indian Journal of Chemical Technology, 7. pp. 227-229. ISSN 0971-457X

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Abstract

A simple and selective complexometric method for the determination of thalliunt(Ill) 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 hack titrated (pH 5 - 6, hexamine) with standard zinc sulphate solution using xylenol orange indicator. A freshly prepared 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.

Item Type: Article
Uncontrolled Keywords: thallium(III), complexometric method,
Subjects: Engineering > MIT Manipal > Chemistry
Engineering > MIT Manipal > Printing and Media
Depositing User: MIT Library
Date Deposited: 23 Dec 2013 09:59
Last Modified: 07 Jan 2014 05:16
URI: http://eprints.manipal.edu/id/eprint/138064

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