锆-7-(1-苯偶氮)-8-羟基喹啉-5-磺酸-Triton X-100荧光熄灭法测定锆

A Fluorescence Quenching Method for Determination of Trace Zirconium（Ⅳ）with 7-（1-Phenylazo）-8-hydroxy-quinoline-5-sulfonic Acid and Triton X-100

基于在pH＝4．5～5.5、TritonX－100存在下、锆同7－（1-苯偶氮）－8-羟基喹啉-5-磺酸形成组成比为1：3的黄色络合物使荧光熄灭，建立了荧光熄灭测定锆的新方法。该方法的线性范围为0～28μgZrO2／L，检测限为0．5μg／L，体系稳定，灵敏度高，用于α-βAl2O3及瓷釉中锆的测定，结果满意。

A new fluorescence quenching method for the determination of trace zirconium is proposed． At pH 4．5～5．5 and In the presence of Triton X－100， the 7－I1－phenylazo）－8－hy droxy－quinoline－5－sulfonic acid（H2PAHQS） has 8 maximum excitation wavelength at 362 nm and maximum emission wavelength at 500 nm． Zr（Ⅳ）， H2PAHQS and Triton X－100 react to form a ternarycomplex and conduce fluorescence quenching． Its constituent is established by the methods of isomolar continuous variation and molar ratio as Zr（Ⅳ）： H2PAHQS =1： 3．The linear range of determination is 0～28μg／L ZrO2with a detection limit of 0．5μg／L．The method is selective and highly sensitive to zirconium. This system has been applied to the determination of trace zirccnium in α-β Al2O3 and porcelain glaze samples with satisfacto ry results．