Complexometric determination of mercury(II) using 2-thiobarbituric acid as a releasing agent

Karthikeyan, J and Parameshwara, P and Shetty, Prakash and Shetty, Nityananda A (2007) Complexometric determination of mercury(II) using 2-thiobarbituric acid as a releasing agent. Indian Journal of Chemical Technology, 14. pp. 209-211. ISSN 0971-457X

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Abstract

A simple and selective complexometric method for the deter- mination of mercury is proposed, based on the selective releasing ability of 2-thiobarbituric acid towards mercury(II). Mercury(II) present in a given sample solution is first complexed with an ex-cess of EDTA and the unreacted EDTA is titrated against zinc sulphate solution at pH 5-6 (hexamine buffer) using xylenolorange as the indicator. An excess of a 0.25% solution of 2-thiobarbituric acid is then added to displace EDTA from the Hg(II)-EDTA complex. The released EDTA is estimated. Repro-ducible and accurate results are obtained for 3-95mg of mer-cury(II) with coefficient of variation not more than 0.34%. The effects of various ions were studied. The method is used for the analysis of mercury in its synthetic alloy mixtures and also in complexes.

Item Type: Article
Uncontrolled Keywords: Mercury(II) determination, 2-Thiobarbituric acid, Masking reagent, Complexometric titration, EDTA
Subjects: Engineering > MIT Manipal > Chemistry
Engineering > MIT Manipal > Printing and Media
Depositing User: MIT Library
Date Deposited: 02 Jan 2014 06:53
Last Modified: 02 Jan 2014 06:53
URI: http://eprints.manipal.edu/id/eprint/137610

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