Preconcentration and determination of lead(II) at crown ether and cryptand containing chemically modified electrodes
作者： Sunil V. Prabhu , Richard P. Baldwin , Lars Kryger
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摘要: Chemically modified electrodes (CMEs) containing incorporated crown ether and cryptand ligands as modifiers were evaluated for their ability to preconcentrate metal cations prior quantitation by conventional voltammetric methods. Stable CMEs formed 18-crown-6, dibenzo-18-crown-6, poly(dibenzo-18-crown-6), dibenzo-24-crown-8, 2.2.2-cryptand mixing the desired amount of ligand into carbon paste. The resulting exhibited complexing capabilities that similar those free ligands. In particular, very reactive toward Pb2+ Hg2+. uptake was sufficiently strong a detection limit 1 μM obtained following 20-sec exposure sample transfer blank electrolysis solution differential pulse analysis. Accurate micromolar levels Pb in water urine reference standards achieved at means simple procedure requiring minimal preparation. Finally, analytical characteristics CME preconcentration directly compared electrodeposition approach ordinarily employed stripping voltammetry.
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