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以微波法合成的碳量子点为荧光探针,建立了测定Cd2+的荧光猝灭法。在pH 4.0的乙酸-乙酸钠缓冲溶液中,体系荧光猝灭强度和Cd2+浓度呈线性关系,线性回归方程为ΔF=0.1598ρ+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。
The carbon quantum dots synthesized by microwave method were fluorescent probes, and the fluorescence quenching method for the determination of Cd2 + was established. The linear relationship between fluorescence quenching intensity and Cd2 + concentration was linear in acetate-sodium acetate buffer solution at pH 4.0. The linear regression equation was ΔF = 0.1598ρ + 8.1781 with a correlation coefficient of 0.9982 and the linear range was 1.0-500 μg / L The limit of detection was 0.5 μg / L with the relative standard deviation of 1.3% and the recovery of 98.6% -101.6%. The method has been applied to the determination of trace Cd in environmental water.