Indirect complexometric determination of mercury(II) using 1-propane thiol (PT) as a selective masking agent

Parameshwara, P and Karthikeyan, J and Shetty, Nityananda A and Shetty, Prakash (2005) Indirect complexometric determination of mercury(II) using 1-propane thiol (PT) as a selective masking agent. Indian Journal of Chemical Technology, 12. pp. 727-729. ISSN 0971-457X

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Abstract

A complexometric method for the determination of mer-cury(II) in presence of other metal ions is described based on the selective masking action of 1-propane thiol towards mercury(II). Mercury(II) present in a given sample solution is first complexed with an excess of EDTA and the unreacted EDTA is titrated against lead nitrate solution at pH 5-6 (hexamine buffer) using xylenol orange as the indicator. A 0.8% aqueous solution of 1-propane thiol is then added to displace EDTA from the Hg(II)-EDTA complex. The released EDTA is titrated with standard lead nitrate solution as before. Reproducible and accurate results are obtained for 4-85 mg of mercury(II), with relative error less than ±0.23 % and coefficient of variation not more than ±0.41 %. The effects of various ions were studied. The method is used for the analysis of mercury(II) in its synthetic alloy mixtures and also in complexes.

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