A simple electrochemical sensor based on rGO/MoS<sub>2</sub>/CS modified GCE for highly sensitive detection of Pb(<scp>ii</scp>) in tobacco leaves
Chuanen Guo, Chengxiang Wang, Hongyan Sun, Dongmei Dai, Hongtao Gao
Abstract
could provide a large reaction specific surface area and a certain active site for heavy metal reaction. Chitosan (CS) was used to improve the enrichment ability of heavy metals and increase the electrocatalytic activity of electrode. Thus, an electrochemical sensor with excellent performance in reproducibility, stability and anti-interference ability was established. The stripping behavior of Pb(ii) and the application conditions of the sensor were studied by square wave anodic stripping voltammetry (SWASV). The investigation indicated that the sensor exhibited high detection sensitivity in the range of 0.005-0.05-2.0 μM, and the limit of detection (LOD) was 0.0016 μM. This work can provide a fast and effective method for determination of Pb(ii) in samples with low content, such as tobacco leaves.