Li Jing, Guo Shaojun, Zhai Yueming, Wang Erkang
State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin, 130022, China.
Anal Chim Acta. 2009 Sep 7;649(2):196-201. doi: 10.1016/j.aca.2009.07.030. Epub 2009 Jul 19.
Graphene nanosheets, dispersed in Nafion (Nafion-G) solution, were used in combination with in situ plated bismuth film electrode for fabricating the enhanced electrochemical sensing platform to determine the lead (Pb2+) and cadmium (Cd2+) by differential pulse anodic stripping voltammetry (DPASV). The electrochemical properties of the composite film modified glassy carbon electrode were investigated. It is found that the prepared Nafion-G composite film not only exhibited improved sensitivity for the metal ion detections, but also alleviated the interferences due to the synergistic effect of graphene nanosheets and Nafion. The linear calibration curves ranged from 0.5 microg L(-1) to 50 microg L(-1) for Pb2+ and 1.5 microg L(-1) to 30 microg L(-1) for Cd2+, respectively. The detection limits (S/N=3) were estimated to be around 0.02 microg L(-1) for Pb2+ and Cd2+. The practical application of the proposed method was verified in the water sample determination.
分散在Nafion（Nafion-G）溶液中的石墨烯纳米片与原位镀铋膜电极结合使用，用于构建增强型电化学传感平台，通过差分脉冲阳极溶出伏安法（DPASV）测定铅（Pb2+）和镉（Cd2+）。研究了复合膜修饰玻碳电极的电化学性质。结果发现，制备的Nafion-G复合膜不仅对金属离子检测表现出更高的灵敏度，而且由于石墨烯纳米片和Nafion的协同作用减轻了干扰。Pb2+的线性校准曲线范围为0.5 μg L(-1)至50 μg L(-1)，Cd2+的线性校准曲线范围为1.5 μg L(-1)至30 μg L(-1)。Pb2+和Cd2+的检测限（S/N = 3）估计约为0.02 μg L(-1)。该方法的实际应用在水样测定中得到了验证。
