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

Prakash Shetty, A. Nityananda Shetty

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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
Issue number2
Publication statusPublished - 01-03-2004


All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)

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