Simultaneous determination of cadmium (II) and lead (II) with clay nanoparticles and anthraquinone complexly modified glassy carbon electrode

作者：Yuan S; Chen WH; Hu SH^*

来源：Talanta, 2004, 64(4): 922-928.

DOI：10.1016/j.talanta.2004.04.008

• 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.

• 出版日期2004-11-15
• 单位武汉大学; 湖北科技学院