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Kinetic determination of mercury(II) at trace level from its catalytic effect on a ligand substitution process

Prasad, Surendra (2005) Kinetic determination of mercury(II) at trace level from its catalytic effect on a ligand substitution process. Journal of Analytical Chemistry, 60 (6). pp. 581-588. ISSN 1061-9348

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Abstract

A catalytic kinetic method (CKM) is presented for the determination of mercury(II) based on its catalytic effect on the rate of substitution of N-methylpyrazinium ion (Mpz+) onto hexacyanoferrate(II). The progress of the reaction was monitored spectrophotometrically at 655 nm by registering the increase in absorbance of the product [Fe(CN)5(Mpz]2− under the reaction conditions: 5 × 10−3 mol L−1 [Fe(CN)6]4−), 5 × 10−5 mol L−1 [Mpz+], T = 25.0 ± 0.1°C, pH 5.00 ± 0.02 and ionic strength, I = 0.1 mol L−1 (KNO3). Quantitative rate data at specified experimental conditions showed a linear dependence of the absorbance after fixed time A t on the concentration of mercury(II) catalyst in the range 20.06–702.1 ng mL−1. The maximum relative standard deviations and percentage errors for the determination of mercury(II) in the range of 20.06–200.6 ng mL−1 were calculated to be 1.7 and 2.7% respectively. The detection limit was found to be 7.2 ng mL−1 of mercury(II). Accuracy (expressed in terms of recoveries) was in the range of 98–103%. Figures of merit and interference due to many cations and anions was investigated and discussed. The applicability of the method was demonstrated by determining the mercury(II) in different synthetic samples and confirming the results using atomic absorption spectrophotometry. The proposed method allowed determination of mercury(II) in the range 20.06–702.1 ng mL−1 with very good selectivity and an output of 30 samples h−1.

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 Mereoni Camailakeba
Date Deposited: 20 Apr 2005 17:29
Last Modified: 17 Jul 2012 17:00
URI: http://repository.usp.ac.fj/id/eprint/3395
UNSPECIFIED

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