Complexometric method for the determination of mercury using sodium metabisulphite as selective masking reagent

Prakash Shetty, A. Nityananda Shetty

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

A selective complexometric method is described for the determination of mercury(II) using sodium metabisulphite as a masking reagent. An excess of EDTA is added to mercury(II) solution containing associated diverse metal ions and the surplus EDTA is back titrated at pH 5-6 (hexamine buffer) with standard zinc sulphate solution using xylenol orange as indicator. An aqueous solution of sodium metabisulphite is then added to displace EDTA selectively from Hg-EDTA complex and the released EDTA is then titrated against the same standard zinc sulphate solution. Reproducible and accurate results are obtained in the range 4-100 mg of mercury with a relative error ≤ 0.26% and coefficient of variation ≤0.40%. The method is useful for the analysis of mercury in complexes and alloy samples.

Original languageEnglish
Pages (from-to)163-165
Number of pages3
JournalIndian Journal of Chemical Technology
Volume11
Issue number2
Publication statusPublished - 01-03-2004

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Ethylenediaminetetraacetic acid
Mercury
Edetic Acid
Sodium
Zinc Sulfate
Zinc
Methenamine
Mercury (metal)
Metal ions
Buffers
metabisulfite
Sulfates

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)

Cite this

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abstract = "A selective complexometric method is described for the determination of mercury(II) using sodium metabisulphite as a masking reagent. An excess of EDTA is added to mercury(II) solution containing associated diverse metal ions and the surplus EDTA is back titrated at pH 5-6 (hexamine buffer) with standard zinc sulphate solution using xylenol orange as indicator. An aqueous solution of sodium metabisulphite is then added to displace EDTA selectively from Hg-EDTA complex and the released EDTA is then titrated against the same standard zinc sulphate solution. Reproducible and accurate results are obtained in the range 4-100 mg of mercury with a relative error ≤ 0.26{\%} and coefficient of variation ≤0.40{\%}. The method is useful for the analysis of mercury in complexes and alloy samples.",
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Complexometric method for the determination of mercury using sodium metabisulphite as selective masking reagent. / Shetty, Prakash; Nityananda Shetty, A.

In: Indian Journal of Chemical Technology, Vol. 11, No. 2, 01.03.2004, p. 163-165.

Research output: Contribution to journalArticle

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