Bifunctional polydopamine[at]Fe sub(3)O sub(4) core-shell nanoparticles for electrochemical determination of lead(II) and cadmium(II)

The present paper has focused on the potential application of the bifunctional polydopamine[at]Fe sub(3)O sub(4) core-shell nanoparticles for development of a simple, stable and highly selective electrochemical method for metal ions monitoring in real samples. The electrochemical method is based on electrochemical preconcentration/reduction of metal ions onto a polydopamine[at]Fe sub(3)O sub(4) modified magnetic glassy carbon electrode at -1.1 V (versus SCE) in 0.1 M pH 5.0 acetate solution containing Pb super(2+) and Cd super(2+) during 160 s, followed by subsequent anodic stripping. The proposed method has been demonstrated highly selective and sensitive detection of Pb super(2+) and Cd super(2+), with the calculated detection limits of 1.4 x 10 super(-11) M and 9.2 x 10 super(-11) M. Under the optimized conditions, the square wave anodic stripping voltammetry response of the modified electrode to Pb super(2+) (or Cd super(2+)) shows a linear concentration range of 5.0-600 nM (or 20-590 nM) with a correlation coefficient of 0.997 (or 0.994). Further, the proposed method has been performed to successfully detect Pb super(2+) and Cd super(2+) in aqueous effluent.