Indirect complexometric determination of mercury(II) in synthetic alloys and complexes using ethanethiol as a selective masking agent

J. Karthikeyan, P. Parameshwara, A. Nityananda Shetty, Prakash Shetty

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Abstract

A complexometric method for the determination of mercury(II) in presence of other metal ions, based on the selective masking action of ethanethiol towards mercury(II) is described. Mercury(II) present in a given sample solution is first complexed with an excess of EDTA and the unreacted EDTA is titrated against zinc sulphate solution at pH 5-6 (hexamine buffer) using xylenol orange as the indicator. An excess of a 0.3 % solution of ethanethiol is then added to displace EDTA from the Hg(II)-EDTA complex. The released EDTA is titrated with a standard zinc sulphate solution. Reproducible and accurate results are obtained for 4-85 mg of mercury(II) with a relative error of less than ± 0.46 % and coefficient of variation of not more than 0.47 %. The effects of the presence of various ions were studied. The method can be used for the analysis of mercury in its synthetic alloy mixtures and also in complexes.

Original languageEnglish
Pages (from-to)269-275
Number of pages7
JournalJournal of the Serbian Chemical Society
Volume71
Issue number3
DOIs
Publication statusPublished - 29-05-2006

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All Science Journal Classification (ASJC) codes

  • Chemistry(all)

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