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Title: Complexometric method for the determination of mercury using sodium metabisulphite as selective masking reagent
Authors: Shetty, P.
Nityananda, Shetty, A.
Issue Date: 2004
Citation: Indian Journal of Chemical Technology, 2004, Vol.11, 2, pp.163-165
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.
Appears in Collections:1. Journal Articles

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