Voltammetric Determination of Pb<sup>2+</sup> in Water using Mn‐doped MoS<sub>2</sub>/MWCNTs/Nafion Electrode Coupled with an Electrochemical Flow Analysis Device
Chen Zhang, Zhiwei Lai, Xuelian Liu, Min Ye, Linchun Zhang, Li Zhang, Xi Chen
Abstract
Abstract A glassy carbon electrode modified with Mn−MoS 2 /MWCNTs/Nafion was used for the field determination of Pb 2+ in water coupled with an electrochemical flow analysis device. The potential mechanism for signal enhancement of Pb 2+ was preliminarily confirmed in this work. A limit of detection (3σ/slope) for Pb 2+ was 0.08 μg L −1 within the concentration from 0.2 to 100 μg L −1 using this method. The relative standard deviation of response currents for 30 μg L −1 Pb 2+ was 3.6 % (n=80) and the recoveries varied from 97.3 % to 105.6 % in the determination of tap water and lake water samples obtained from laboratories and the university campus. Finally, the continuous monitoring of Pb 2+ in water was successfully realized by this Mn−MoS 2 /MWCNTs/Nafion modified electrode coupled with the analysis device.