期刊
ELECTROCHIMICA ACTA
卷 56, 期 1, 页码 463-469出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2010.09.025
关键词
3D gold micro-/nanopore array; 2-Mercaptobenzothiazole adapters; Mercury; Electrochemical determination
资金
- Chinese Academy of Sciences
- National Key Scientific Program - Nanoscience and Nanotechnology [2011CB933700]
- National Natural Science Foundation of China [20907035, 60574094]
- National Basic Research Program of China [2007CB936603]
- Young Program of Anhui Province [2010SQRL183]
Three-dimensional (3D) gold micro-/nanopore arrays containing 2-mercaptobenzothiazole (MBT) adapters have been prepared and employed to improve the performance of the determination of trace mercury in solution using square wave anodic stripping voltammetry (SWASV). 3D gold micro-/nanopore arrays have an active surface area which is up to 4 and 15 times higher than a two-dimensional (2D) bowl-like structured microarrays and a flat solid gold electrode characterized by cyclic voltammetry, respectively. In this study, 3D MBT molecular adapters on the array surface greatly decreased the effect of capacitive current and enhanced the sensitivity and selectivity of the electrode. A limit of detection of 0.02 nM (which is well below the guideline given by the World Health Organization) and more importantly, a sensitivity of 1.85 mu A nM(-1) was obtained using this system. Furthermore, excellent linear range (0.05-10 nM) and good repeatability (relative standard deviation of 2.10%) were obtained for Hg(II). Interference experiments were also investigated, and it was determined that Pb(II), Cd(II), Zn(II), Cu(II) and Ag(I) had little or no influence on the mercury signal. (C) 2010 Elsevier Ltd. All rights reserved.
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