Abstract
A new voltammetric sensor based on an aryl amide type podand, 1,8-bis(o-amidophenoxy)-3,6-dioxaoctane, (AAP) modified glassy carbon electrode, was described for the determination of trace level of mercury (II) ion by cyclic voltammetry (CV) and differential pulse voltammetry (DPV). A well-defined anodic peak corresponding to the oxidation of mercury on proposed electrode was obtained at 0.2 V versus Ag/AgCl reference electrode. The effect of experimental parameters on differential voltammetric peak currents was investigated in acetate buffer solution of pH 7.0 containing 1 × 10−1 mol L−1NaCl. Mercury (II) ion was preconcentrated at the modified electrode by forming complex with AAP under proper conditions and then reduced on the surface of the electrode. Interferences of Cu2+, Pb2+, Fe3+, Cd2+, and Zn2+ions were also studied at two different concentration ratios with respect to mercury (II) ions. The modified electrode was applied to the determination of mercury (II) ions in seawater sample.
Highlights
Podands, which are the member of the crown-ether family, have an importance in supramolecular chemistry because of their applications in ion sensing and have high productivity and selectivity in forming complexes with alkali, alkaline earth metal, and transition metal ions [1,2,3]
The results indicated that voltammetric peaks were observed in all electrolyte solutions, but the electrochemical response of mercury (II) ion in 0.1 moL L−1 HAc + 0.1 moL L−1
AAP modified glassy carbon electrode showed the stable activity over the range of pH 3.0–12.0, and the best peak height and shape were obtained at pH 7.0
Summary
Podands, which are the member of the crown-ether family, have an importance in supramolecular chemistry because of their applications in ion sensing and have high productivity and selectivity in forming complexes with alkali, alkaline earth metal, and transition metal ions [1,2,3]. Current instrumental analysis methods, such as UV spectrophotometry [7], X-ray fluorescence [8], atomic fluorescence spectrometry (AFS) [9], cold vapor atomic fluorescence spectrometry [10], atomic absorption spectrometry (AAS) [11], cold vapor atomic absorption spectrometry [12], and inductively coupled plasma mass spectrometry [13], have been extensively employed for trace determination of mercury (II) ion in the laboratory conditions Since they are expensive, time-consuming and complicated for in situ measuring, they are not suitable for point-of-use applications. CMEs have various advantages, such as low cost, short analysis time, high sensitivity and selectivity in electroanalytical determinations of different compounds [16]. AAP is a hopeful modifying agent in sensor application for determination of mercury (II) ion in mixture of aqueous solution compared with the other crown-ether molecules since it can be synthesized and modified on electrode surface
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