Ag+存在下催化还原铬黑T及应用于Ag+检测

以铬黑T(EBT)为探针,在有Ag⁺存在的最优条件下,EBT被NaBH 4催化还原,体系在445 nm发射波长处荧光强度明显增强,基于此构建一种光学测定溶液中微量Ag⁺的方法。在最优条件下,Ag⁺浓度在(7.5×10-9~1.0×10^-6 mol·L^-1)范围内呈良好的线性关系,线性回归方程为ΔI F=5.59×10⁸ c-31(c,mol·L^-1,r=0.9966),Ag⁺的最低有效检测浓度为6.0×10^-8 mol·L^-1。在最优条件下,运用该方法对样品中Ag⁺浓度进行检测,样品中Ag⁺浓度的检测回收率在98.8%~102.4%之间,RSD=2.1%。该检测方法能够对水溶液中微量的Ag⁺进行有效定量检测,且操作简单、检测限低、灵敏度高。

Catalytic reduction of chromium black T in the presence of Ag+ and its application in Ag+detection

Chrome black T(EBT)was used as a probe.Under the optimal conditions with Ag⁺,EBT was catalyzed by NaBH 4 and the fluorescence intensity of the system was significantly enhanced at the emission wavelength of 445nm.Based on this,an optical method for the determination of trace Ag⁺in solution was constructed.Under the optimal conditions,the concentration of Ag⁺in(7.5 x 10-9~1.0 x 10^-6 mol·L^-1)had good linear relationship within the scope,the linear regression equation forΔI F=5.59 x 10⁸ c-31(c,mol·L^-1,r=0.9966),the minimum effective detection concentration of Ag⁺was 6.0×10^-8 mol·L^-1.Under the optimal conditions,the method was used to detect the concentration of Ag⁺in samples.The recovery rate of the concentration of Ag⁺in samples ranged from 98.8%~102.4%,RSD=2.1%.This method can effectively detect trace Ag⁺in aqueous solution with simple operation,low detection limit and high sensitivity.