氧化石墨烯-吖啶橙荧光光度法测定镉（Ⅱ）离子

摘要

在碱性介质中，氧化石墨烯吸附吖啶橙（AO），对 AO 的荧光可产生猝灭作用，加入适量镉（Ⅱ）离子，体系在526 nm 处的荧光增强，ΔF 值与镉（Ⅱ）离子浓度在2．97×10－8～4．40×10－7 mol／L 范围内呈良好线性关系，线性回归方程为ΔF ＝5．318 c（10－8 mol／L）＋13．34，r ＝0．9970，检测限为8．90×10－9 mol／L，相对标准偏差为1．58％～2．52％。本方法操作简便、快速、仪器设备简单，已用于实际样品测定，结果满意。%In alkaline medium,acridine orange (AO)is absorbed on graphene oxide (GO),resulting in the fluorescence quenching of AO.After adding proper amount of cadmium ions,the fluorescence en-hancement of the system at 526 nm was observed,and ΔF was propotional to the Cd2 +concentration ran-ging from 2.97 to 44.0 ×1 0 -8 mol /L.The linear regression equation was ΔF =5.31 8c(1 0 -8 mol /L)+1 3.34 with a correlation coefficient of 0.997 0,and the detection limit was 8.90 ×1 0 -9 mol /L.The rela-tive standard deviations were 1 .58% ~2.52%.This method is easy and convenient,and quick,without expensive equipment.It has been used for the determination of cadmium (Ⅱ)ions in real samples with a satisfactory result.