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KMID : 0382420000260040110
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Korean Journal of Environmental Health Society
2000 Volume.26 No. 4 p.110 ~ p.114
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Determination of Mercury ( II ) Using Nafion-EDTA-Modified Glassy Carbon Electrodes
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Jung Keun-Ho
Park Chan-Ju
Park Youl-Hee
Lee Ji-Young
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Abstract
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Determination of mercury(Ⅱ) using Nafion-EDTA-modified glassy carbon electrodes is proposed. It is based on the chemical reactivity of an immobilized modifier, Nafion-EDTA. Differential pulse voltammetry is employed, and the oxidation of complexes, at +0.43V vs. Ag/AgCl, is observed. For a 5-min preconcentration period, a linear calibration curve is obtained for mercury(Ⅱ) concentrations ranging from 1.0×10 exp(-8) to 1.0×10 exp(-6)M. Further, when an approximate amount of copper(Ⅱ) is added to the test solution, We demonstrate that at a preconcentration time of 5 min the Nafion-EDTA-modified glassy carbon electrode has a dynamic range of 2 orders of magnitude(from 10^-10 to 10^-8M) and the detection limit is as low as 0.5×10 exp(-10)M(0.01 ppb). This method is applied to the determination of mercury(Ⅱ) in sea water(4.0×10 exp(-10)M, 0.08 ppb). The result agrees satisfactorily with the value(below 0.1 ppb) measured by using ICP/MS.
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