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Nafion-EDTA-Glycerol이 수식된 유리탄소전극에 의한 Mercury(Ⅱ)의 정량에 관한 연구
박율희,박찬주,박은희,정근호 全南大學校 師範大學 科學敎育硏究所 2002 科學敎育硏究誌 Vol.26 No.1
Electrodes with the functionality of Perfluorosulfonate Ionomer(Nafion) -EDTA(ethylene diamine tetraacetic acid)-glycerol can easily prepared by taking advantage of nafion -EDT A -glycerol modified glassy carbon electrode. Such electrodes show excellent sensitivity for the determination of Mercury(ID. The peak pontentials by differentil pulse voltammetry are observed at +0.421 V( 0.015V vs. Ag/ AgCD and a linear calibration curve is obtained over the 1.0 x 1O⁻⁹M - 1.0X 10⁻¹²M range in pH 2 solution with a detection limit(3s) of 5.0 x 1O⁻¹³M.
Nafion-EDTA가 수식된 유리탄소전극을 이용한 수은(II)의 측정
정근호,박찬주,박율희,이지영 한국환경보건학회 2000 한국환경보건학회지 Vol.26 No.4
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 1.0×10-8 to 1.0×10-6 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 10-8 M) and the detection limit is as low as 0.5×10-10 M(0.01 ppb). This method is applied to the determination of mercury(II) in sea water(4.0×10-10 M, 0.08ppb). The result agrees satisfactorily with the value(below 0.1 ppb) measured by using ICP/MS.