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Title: Complexometric determination of mercury(II) using 2-thiobarbituric acid as a releasing agent
Authors: Karthikeyan, J
Parameshwara, P
Shetty, A Nityananda
Shetty, Prakash
Keywords: Mercury(II) determination;2-Thiobarbituric acid;Masking reagent;Complexometric titration;EDTA
Issue Date: Mar-2007
Publisher: CSIR
IPC Code: C22B43/00, B01
Abstract: A simple and selective complexometric method for the deter-mination of mercury is proposed, based on the selective releasing ability of 2-thiobarbituric acid towards mercury(II). Mercury(II) present in a given sample solution is first complexed with an ex-cess of EDTA and the unreacted EDTA is titrated against zinc sulphate solution at pH 5-6 (hexamine buffer) using xylenol orange as the indicator. An excess of a 0.25% solution of 2-thiobarbituric acid is then added to displace EDTA from the Hg(II)-EDTA complex. The released EDTA is estimated. Repro-ducible and accurate results are obtained for 3-95 mg of mer-cury(II) with coefficient of variation not more than 0.34%. The effects of various ions were studied. The method is used for the analysis of mercury in its synthetic alloy mixtures and also in complexes.
Page(s): 209-211
ISSN: 0971–457X
Appears in Collections:IJCT Vol.14(2) [March 2007]

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