Indirect complexometric determination of mercury(II) in synthetic alloys and complexes using ethanethiol as a selective masking agent

Indirect complexometric determination of mercury(II) in synthetic alloys and complexes using ethanethiol as a selective masking agent

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Acomplexometric method for the determination of mercury(II) in presence of other metal ions, based on the selective masking action of ethanethiol towards mercury( II) is described.Mercury(II) present in a Fireplace Tools given sample solution is first complexed with an excess of EDTAand the unreacted EDTAis titrated against zinc sulphate solution at pH 5-6 (hexamine buffer) using xylenol orange as the indicator.An excess of a 0.

3 % solution of ethanethiol is then added to displace EDTA from the Hg(II)-EDTA complex.The released EDTAis titrated with a standard zinc sulphate solution.Reproducible and accurate Saute Pans results are obtained for 4-85 mg of mercury(II) with a relative error of less than +-0.

46 % and coefficient of variation of not more than 0.47 %.The effects of the presence of various ions were studied.

The method can be used for the analysis of mercury in its synthetic alloy mixtures and also in complexes.