Abstract: In order to monitor the content of lead ions in drinking water and evaluate the quality of drinking water in livestock and poultry farms，a method based on Prussian blue/graphene modified electrode was established. Prussian blue nanoparticles were attached to the surface of graphene by electrochemical precipitation. The chemical properties of the prepared modified electrode were analyzed by differential pulse voltammetry. Moreover，the sensitivity，stability and detection limit of lead ions on the surface of the prepared electrode were analyzed. Finally， the reliability of the modified electrode prepared in the experiment to detect lead ions in drinking water of livestock andpoultry was evaluated. Results showed that in the phosphate buffer（0.10 mol/L，pH=4.5），the lead ion had a linear function relationship with the current value，which was in the range of 1×10-9 to 1×10-4，and the detection limit was 2.5 ×10-9 mol/L. In conclusion，the method of modified electrode based on Prussian blue/graphene has a wide linear range，low detection limit，good stability，strong anti ? interference ability and high sensitivity，indicating that the method is suitable for the detection of lead ions in drinking water of livestock and poultry.

Key words: Graphene, Prussian blue, Modified electrode, Pb2+, Differential pulse voltammetry

摘要： 为监测畜禽饮用水中铅离子的含量，对畜禽养殖场的饮用水质量进行评价，本文建 立了一种基于普鲁士蓝/石墨烯修饰电极的检测畜禽饮用水中铅离子的方法。采用电化学沉淀 法使石墨烯表面附着普鲁士蓝纳米颗粒，并对制备的修饰电极使用差分脉冲伏安法进行化学 性质分析，以及检测铅离子在所制备的电极表面的灵敏度、稳定性和检出限，评估了试验所制 备的修饰电极检测畜禽饮用水中铅离子的可靠性。结果表明，在pH 4.5的磷酸盐缓冲液（0.10 mol/L）中，铅离子在1×10-4～1×10-9浓度范围内与电流值呈现一次方函数关系，最低检测限为 2.5×10-9 mol/L。综上所述，基于普鲁士蓝/石墨烯修饰电极的线性范围宽，检出限低，稳定性 好，抗干扰能力强，灵敏度高，适用于畜禽饮用水中铅离子的检测。

关键词: 石墨烯, 普鲁士蓝, 修饰电极, 铅离子, 差分脉冲伏安法