Simultaneous determination of Cd(II) and Pb(II) ions in honey and milk samples using a single-walled carbon nanohorns modified screen-printed electrochemical sensor.

In view of the significant risk of heavy metal ions on human health, effective determination method is quite urgent. Herein, a single-walled carbon nanohorns modified screen-printed electrode was proposed as a disposable electrochemical sensor. The electrochemical study reveals that the developed electrode possesses excellent electrochemical activity. By combination of bismuth film, the electrochemical sensor exhibits distinct and detached stripping peaks towards cadmium and lead. Under the optimized conditions, the linear range of the single-walled carbon nanohorns film modified electrode for both heavy metal ions varied from 1.0 to 60.0 μg L-1. The detection limit of cadmium (II) and lead (II) ions was 0.2 μg L-1 and 0.4 μg L-1. Furthermore, the determination of cadmium (II) and lead (II) ions in honey and milk samples illustrates the prepared electrochemical sensor possesses excellent practicability for determining cadmium (II) and lead (II) ions in a low levels (μg L-1).