Determination of Pb（II） in environmental water by nano-ceria-graphene modified electrodeEI北大核心CSCD

Nafion solution as a binder，the Gr/CeO2 /Nafion/GCE modified electrode was prepared based on graphene （Gr）-nano cerium oxide （CeO2 ）composite materials. The electrochemical behavior of Pb（II）on the modified electrode was investigated using differential pulse anodic stripping voltammetry （DPASV）. Subsequently，a determination method for Pb（II）was established. The concentrations and ratio of composite materials，buffer solution pH，modification amount，enrichment potential and time were optimized. Under the optimal conditions ，the peak current of Gr/CeO2 /Nafion/GCE showed good linearity in the range of 0.24-48.31 μµmol/L of Pb（II），and the detection limit was 4.3 nmol/L. Interference experiments showed that the other common anions and cations in water samples caused little interference to Pb（II）detection. Furthermore，the interference of Cu（II）within 10 times is acceptable. The modified electrode was used to the detection of Pb（II） in four complex water samples，and the recovery rates of the spiked assays were from 89.5% to 107.7%. © 2023, Youke Publishing Co.,Ltd. All rights reserved.