Simultaneous determination of Cd(II) and Pb(II) ions in honey and milk samples using a single-walled carbon nanohorns
Yao Yao1, Hao Wu2, Jianfeng Ping1
1School of Biosystems Engineering and Food Science, Zhejiang University, 866 Yuhangtang Road, Hangzhou 310058, PR China.
Abstract:
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).
Related Concept Videos
What is an Electrochemical Gradient?
The chemical gradient relies on differences in the abundance of a substance on the outside versus the inside of a cell and flows from areas of high to low ion concentration. In contrast, the electrical gradient revolves around an...
Ion Channels
Ion channels are specialized integral membrane proteins on the plasma membrane that allow...
The Carbon Cycle
Common Ion Effect
Carbon Skeletons
Precipitation of Ions
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:


