Complexometric Determination of Mercury(II) Using 2-Mercaptopropionylglycine as a Selective Masking Reagent

Shetty, Prakash and Shetty, Nityananda A and Gadag, R V (2001) Complexometric Determination of Mercury(II) Using 2-Mercaptopropionylglycine as a Selective Masking Reagent. Mikrochim. Acta, 137 (1-2). pp. 71-73. ISSN 1436-5073

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Abstract

A selective complexometric method for the determination of mercury(II) in the presence of associated metal ions is reported, based on the selective masking ability of 2-mercaptopropionylglycine (MPGH2) towards mercury. Mercury, along with other associated metal ions, is first complexed with excess of EDTA and the surplus EDTA is back titrated at pH 5±6 (hexamine buffer) with standard zinc sulfate solution using xylenol orange as indicator. An aqueous 1% solution of MPGH2 is then added to displace EDTA selectively from the Hg-EDTA complex and the released EDTA is titrated with the same standard zinc sulfate solution. Reproducible and accurate results are obtained for 4±85mg of mercury with a relative error of <0:26% and coefficient of variation not exceeding 0.42%. The interferences of various cations and anions are studied. The method is used for the analysis of mercury in its complexes and alloy samples.

Item Type: Article
Uncontrolled Keywords: Mercury determination; complexometry; masking; 2-mercaptopropionylglycine; EDTA titration.
Subjects: Engineering > MIT Manipal > Chemistry
Depositing User: MIT Library
Date Deposited: 11 Jan 2012 04:00
Last Modified: 11 Jan 2012 04:00
URI: http://eprints.manipal.edu/id/eprint/2164

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