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A novel catalytic kinetic method for the determination of mercury(ii) in water samples

Agarwal, Abhinav and Verma, Amit K. and Yoshida, Masafumi and Naik, Radhey M. and Prasad, Surendra (2020) A novel catalytic kinetic method for the determination of mercury(ii) in water samples. RSC Advances, 10 . pp. 25100-25106. ISSN 2046-2069

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    Abstract

    Mercury(II) ions act as catalyst in the substitution of cyanide ion in hexacyanoruthenate(II) by pyrazine (Pz) in an acidic medium. This property of Hg(II) has been utilized for its determination in aqueous solutions. The progress of reaction was followed spectrophotometrically by measuring the increase in absorbance of the yellow colour product, [Ru(CN)5Pz]3− at 370 nm (λmax, ε = 4.2 × 103 M−1 s−1) under the optimized reaction conditions; 5.0 × 10−5 M [Ru(CN)64−], 7.5 × 10−4 M [Pz], pH 4.00 ± 0.02, ionic strength (I) = 0.05 M (KCl) and temp. 45.0 ± 0.1 °C. The proposed method is based on the fixed time procedure under optimum reaction conditions. The linear regression (calibration) equations between the absorbance at fixed times (t = 15, 20 and 25 min) and [Hg(II)] were established in the range of 1.0 to 30.0 × 10−6 M. The detection limit was found to be 1.5 × 10−7 M of Hg(II). The effect of various foreign ions on the proposed method was also studied and discussed. The method was applied for the determination of Hg(II) in different wastewater samples. The present method is simple, rapid and sensitive for the determination of Hg(II) in trace amount in the environmental samples.

    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 Shalni Sanjana
    Date Deposited: 05 Nov 2020 11:37
    Last Modified: 05 Nov 2020 11:37
    URI: http://repository.usp.ac.fj/id/eprint/12442
    UNSPECIFIED

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