High-Sensitivity Determination of Lead(II) and Cadmium(II) Based on the CNTs-PSS/Bi Composite Film Electrode

A high-sensitivity sensing platform for lead(II) and cadmium(11) based on the bismuth modified carbon nanotubes (CNTs)-poly(sodium 4-styrenesulfonate) composite film electrode (CNTs-PSS/Bi) was fabricated The composite film CNTs-PSS/Bi provided remarkably improved sensitivity and reproducibility compared with previously reported CNTs-modified electrodes The detection limits were estimated to be 0 04 1)1)1) for lead(II) and 002 ppb for cadmium( II) with a preconcentration time of 120 s, respectively The linear responses of Cd2+ and Pb2+ were over the ranges of 0 5-50 ppb and 0 5-90 pith. respectively Finally, the practical application of the proposed method was verified in the real water sample with satisfactory results