碳量子点荧光探针测定痕量镉

Detection of trace cadmium ion based on carbon quantum dots as fluorescence probe

以微波法合成的碳量子点为荧光探针，建立了测定Cd^2＋的荧光猝灭法。在pH4．0的乙酸-乙酸钠缓冲溶液中，体系荧光猝灭强度和Cd^2＋浓度呈线性关系，线性回归方程为 ΔF=0．1598p＋8．1781，相关系数为0．9982，线性范围为1．0～500μg/L，检出限为0．5μg／L，相对标准偏差为1．3％，回收率为98．6％～101．6％。方法已用于环境水中痕量Cd的测定。

A novel fluorescence quenching method for the detection of trace cadmium ion has been developed by using carbon quantum dots as a fluorescence probe,which was synthesized via a microwave assisted route. In pH4. 0 acetic acid-sodium acetate（ HAc-Na Ac） buffer solution, a linear relationship was obtained between fluorescence intensity and concentration of cadmium ion. the equation of linear regression is ΔF = 0. 1598ρ ＋8. 1781,with the correlation coefficient of 0. 9982 and linear range of 1. 0 - 500 μg/ L. Furthermore,this analytical method was also featured with the detection limit as low as 0. 5 μg/ L,relative standard deviation of1. 3 % and recovery rate between 98. 6% and 101. 6%. This facile and rapid method exported satisfactory results for the determination of trace cadmium ion in application.