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Determination of trace amounts of mercury(II) in water samples using a novel kinetic catalytic ligand substitution reaction of hexacyanoruthenate(II)

Naik, R.M. and Agarwal, A. and Prasad, Surendra (2009) Determination of trace amounts of mercury(II) in water samples using a novel kinetic catalytic ligand substitution reaction of hexacyanoruthenate(II). Spectrochimica Acta Part A - Molecular and Biomolecular Spectroscopy, 74 (4). pp. 887-891. ISSN 1386-1425

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Abstract

A simple, sensitive, selective and rapid kinetic catalytic method has been developed for the determination of Hg(II) ions at micro-level. This method is based on the catalytic effect of Hg(II) ion on the rate of substitution of cyanide in hexacyanoruthenate(II) withnitroso-R-salt (NRS) in aqueous medium and provides good accuracy and precision. The concentration of Hg(II) catalyst varied from 4.0 to 10.0 × 10−6 M and the progress of reaction was followed spectrophotometrically at 525 nm (λmax of purple-red complex [Ru(CN)5NRS]3−, = 3.1 × 103 M−1 s−1) under the optimized reaction conditions; 8.75 × 10−5 M [Ru(CN)64−], 3.50 × 10−4 M [nitroso-R-salt], pH 7.00 ± 0.02, ionic strength, I = 0.1 M (KCl), temp 45.0 ± 0.1 °C. The linear calibration curves, i.e. calibration equations between the absorbance at fixed times (t = 15, 20 and 25 min) versus concentration of Hg(II) ions were established under the optimized experimental conditions. The detection limit was found to be 1.0 × 10−7 M of Hg(II). The effect of various foreign ions on the proposed method has also been studied and discussed. The method has been applied to the determination of mercury(II) in aqueous solutions.

Item Type: Journal Article
Subjects: Q Science > QD Chemistry
Divisions: Faculty of Science, Technology and Environment (FSTE) > School of Biological and Chemical Sciences
Depositing User: Ms Neha Harakh
Date Deposited: 25 May 2009 12:03
Last Modified: 24 Jul 2012 21:32
URI: http://repository.usp.ac.fj/id/eprint/1480
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