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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dc.contributor.authorShetty, P.
dc.contributor.authorNityananda Shetty, A.N.
dc.date.accessioned2026-02-05T11:00:20Z
dc.date.issuedComplexometric method for the determination of mercury using sodium metabisulphite as selective masking reagent
dc.description.abstract2004
dc.identifier.citationIndian Journal of Chemical Technology, 2004, 11, 2, pp. 163-165
dc.identifier.issn0971457X
dc.identifier.urihttps://idr.nitk.ac.in/handle/123456789/27952
dc.subjectalloy
dc.subjectbuffer
dc.subjectedetic acid
dc.subjectmercury
dc.subjectmetal ion
dc.subjectmethenamine
dc.subjectreagent
dc.subjectsodium metabisulfite
dc.subjectunclassified drug
dc.subjectxylene
dc.subjectxylenol orange
dc.subjectzinc sulfate
dc.subjectaccuracy
dc.subjectacidity
dc.subjectaqueous solution
dc.subjectarticle
dc.subjecterror
dc.subjectreproducibility
dc.subjecttitrimetry
dc.titleA 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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