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利用TPPS_4催化动力学荧光测定痕量镉(Ⅱ)已有报道,而利用四(4-三甲铵苯基)卟啉(TAPP)的荧光熄灭测定痕量镉(Ⅱ)的工作尚未见报道.本文研究了室温下Cd(Ⅱ)-TAPP反应体系的荧光光谱特性,发现Cd(Ⅱ)-TAPP的形成使TAPP的荧光发生静态熄灭.利用咪唑(Imid)、十二烷基硫酸钠(SDS)和乙醇增敏、增稳,最低可检测3×10~(-4)ppm Cd(Ⅱ),灵敏度高于其它方法.测定了胶印锌片和人发中的镉,结果与标准值或方法对照值吻合.
The determination of trace cadmium (Ⅱ) by catalytic kinetic fluorimetry (TPPS_4) has been reported, and the work on the determination of trace cadmium (Ⅱ) by fluorescence quenching with tetrakis (4-trimethyl ammonium phenyl) porphyrin (TAPP) has not been reported. The fluorescence spectra of Cd (Ⅱ) -TAPP reaction system were studied at room temperature. It was found that the formation of Cd (Ⅱ) -TAPP quenched the fluorescence of TAPP by static quenching.Imid, sodium dodecyl sulfate (SDS) and Ethanol sensitized and stabilized, and the lowest detectable level of 3 × 10 -4 Cd (Ⅱ) Cd (Ⅱ) was higher than that of other methods.Determination of cadmium in offset sheet and human hair was measured and compared with the standard value or method control value Anastomosis.