期刊
TALANTA
卷 64, 期 4, 页码 922-928出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.talanta.2004.04.008
关键词
clay nanoparticles; anthraquinone; cadmium; lead; voltammetry; chemically modified electrode
An anthraquinone (AQ) improved Na-montmorillonite nanoparticles (nano-SWy-2) chemically modified electrode (CME) has been developed for the simultaneous determination of trace levels of cadmium (II) and lead (II) by differential pulse anodic stripping voltammetry (DPASV). This method is based on a non-electrolytic preconcentration via ion exchange model, followed by an accumulation period via the complex formation in the reduction stage at -1.2 V, and then by an anodic stripping process. The mechanism of this design was proposed and the analytical performance was evaluated with several variables. Under the optimized working conditions, the detection limit was 3 and 1 nM for Cd2+ and Pb2+, respectively. The calibration graphs were linear in the concentration ranges of 8 x 10(-9) to 1 x 10(-6) mol L-1 (Cd2+) and of 2 x 10(-9) to 1 x 10(-6) mol L-1 (Pb2+). Many inorganic species did not interfere with the assay significantly; the high sensitivity, selectivity, and stability of this nano-SWy-2-AQ CME were demonstrated. The applications for the detection of trace levels of Cd2+ and Pb2+ in milk powder and lake water samples indicate that it is an economical and potent method. (C) 2004 Elsevier B.V. All rights reserved.
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