Quantitative complexometric determination of mercury(II) in synthetic alloys and complexes using 2-thiazolinethiol as a masking agent

P. Parameshwara, J. Karthikeyan, A. N. Shetty, P. Shetty

Research output: Contribution to journalArticle

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Abstract

A simple, rapid and selective complexometric method is proposed for the determination of mercury(II). Mercury(II) and other related metal ions are first complexed with an excess of EDTA and the surplus EDTA is back-titrated with a standard lead nitrate solution at pH 5.0-6.0 (hexamine buffer) using xylenol orange as an indicator. A 0.2% solution of 2-thiazolinethiol in acetone is then added to displace EDTA from the Hg(II)-EDTA complex. The released EDTA is titrated with a standard lead nitrate solution as before. Reproducible and accurate results are obtained in the range of 0.8 g 1-1 15.8 g -1 of mercury with a relative error less than ±0.25% and a coefficient of variation (n = 6) not higher than 0.28%. The interference of various ions was studied and the method was employed for the analysis of mercury in its synthetic alloy mixtures and in complexes.

Original languageEnglish
Pages (from-to)168-172
Number of pages5
JournalJournal of the Iranian Chemical Society
Volume3
Issue number2
DOIs
Publication statusPublished - 01-01-2006

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Mercury
Edetic Acid
Methenamine
Acetone
Metal ions
Buffers
Ions
lead nitrate

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 mercury(II). Mercury(II) and other related metal ions are first complexed with an excess of EDTA and the surplus EDTA is back-titrated with a standard lead nitrate solution at pH 5.0-6.0 (hexamine buffer) using xylenol orange as an indicator. A 0.2{\%} solution of 2-thiazolinethiol in acetone is then added to displace EDTA from the Hg(II)-EDTA complex. The released EDTA is titrated with a standard lead nitrate solution as before. Reproducible and accurate results are obtained in the range of 0.8 g 1-1 15.8 g -1 of mercury with a relative error less than ±0.25{\%} and a coefficient of variation (n = 6) not higher than 0.28{\%}. The interference of various ions was studied and the method was employed for the analysis of mercury in its synthetic alloy mixtures and in complexes.",
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Quantitative complexometric determination of mercury(II) in synthetic alloys and complexes using 2-thiazolinethiol as a masking agent. / Parameshwara, P.; Karthikeyan, J.; Shetty, A. N.; Shetty, P.

In: Journal of the Iranian Chemical Society, Vol. 3, No. 2, 01.01.2006, p. 168-172.

Research output: Contribution to journalArticle

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