论文部分内容阅读
将氧化石墨烯(GO)和CdSe复合物修饰到金电极表面,得到了GO/CdSe修饰电极,研究了其电化学发光性质。结果表明,在强碱性溶液中,GO/CdSe修饰电极在鲁米诺溶液中会产生明显的电化学发光信号,而Pb~(2+)对该体系的电化学发光信号有较强的增敏作用,据此建立了检测Pb~(2+)的新方法。考察了GO/CdSe复合物的比例、缓冲溶液的pH、静置时间等条件对ECL强度的影响。在优化的实验条件下,Pb~(2+)浓度在1.0×10-11~1.0×10-7mol/L范围内与相对ECL强度呈现良好的线性关系。检测限(S/N=3)为3.3×10~(-12)mol/L,并用于人工湖水样中Pb~(2+)的测定。
The graphene oxide (GO) and CdSe complexes were modified onto the surface of gold electrode, and the GO / CdSe modified electrode was obtained. The electrochemical luminescence properties of GO / CdSe modified electrode were also studied. The results showed that the GO / CdSe modified electrode produced a significant electrochemiluminescence signal in luminol solution in strong alkaline solution, and the electrochemiluminescence signal of the system was stronger than that of Pb 2+ Therefore, a new method of detecting Pb 2+ was established. The effects of the ratio of GO / CdSe complex, the pH of the buffer solution and the standing time on ECL intensity were investigated. Under the optimal experimental conditions, the concentration of Pb 2+ showed a good linear relationship with the relative ECL intensity in the range of 1.0 × 10-11 ~ 1.0 × 10-7mol / L. The detection limit (S / N = 3) was 3.3 × 10 ~ (-12) mol / L and was used for the determination of Pb 2+ in artificial lake water samples.