三聚氰胺荧光熄灭法测定Ag(Ⅰ)的研究

摘要

基于Ag(Ⅰ)对三聚氰胺的荧光熄灭作用,建立了测定Ag(Ⅰ)的荧光分析方法.在pH为5.0的HAcNaAc缓冲体系中,测定的最大激发波长λex为256.0 nm,最大发射波长λem为363.0 nm,线性范围为2.0x10-6 ～2.4×10-2 mol/L,检出限为4.3×10-7 mol/L.将其用于废定影液中痕量Ag(Ⅰ)的测定,结果满意.%A fluorometric method for the determination of Ag (I) has been set up, according to the effect of Ag( I ) on the fluorescence quenching of melamine. In the Hac-NaAc buffer solution of pH=5.0, the maximum excitation and emission wavelengths of melamine are found to be 256.0 nm, 363.0 nm, respectively. The linear range of determination for Ag (I )is 2.0x10-6- 2.4xl0-2 mol/L,with a detection limit of 4.3×10-7mol/L. The proposed method has been applied to the determination of trace Ag( I) in fixer waste samples, and the results are satisfactory.