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Title: Indirect complexometric determination of mercury(II) using 3-acetyl-2-thiohydantoin as a selective masking agent
Authors: Karthikeyan, J
Parameshwara, P
Shetty, A Nityananda
Keywords: Mercury(II)
Complexometric titration
Issue Date: Sep-2008
Publisher: CSIR
Abstract: A complexometric method for the determination of mercury(II) in presence of other metal ions is described based on the selective masking action of 3-acetyl-2-thiohydantoin 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 standard lead nitrate solution at pH 5-6 (hexamine buffer) using xylenol orange as the indicator. A 0.5% solution of 3-acetyl-2-thiohydantoin is then added to displace EDTA from the Hg(II)-EDTA complex. The released EDTA is estimated. Reproducible and accurate results are obtained for 3.96 - 80 mg of mercury(II) with relative error less than ± 0.25% and coefficient of variation not more than 0.38%. The effects of various ions were studied. The method is used for the analysis of mercury in its synthetic mixtures of ions and in complexes.
Description: 493-496
ISSN: 0971–457X
Appears in Collections:IJCT Vol.15(5) [September 2008]

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