二溴苯羟基荧光酮荧光光度法测定微量锆

Fluorometric Determination of Trace Zirconium With 2,6,7-Trihydroxy-9-(3,5-dibromo-hydroxyphenyl)fluorone and Emulsifying Agent-p-Octylpolyethylenglycol Phenylether

本文提出了一个锆－二溴苯羟基荧光酮（DBHPF）－乳化剂OP荧光光度法测定微量锆的新体系。在0．5～1．2mol／L的HCl介质中，铅与DBHPF生成组成比为1：4的红色荧光性络合物。荧光强度与锆（Ⅳ）的浓度在0～100μg／L呈线性关系；检出限为2．0μg／L，灵敏度高，高选择性好，用于瓷釉等样品中ZrO2的测定，获得满意的结果。

A fluorometric determination of trace zirconium is proposed. In HCl medium, Zr (Ⅳ ), 2, 6, 7-Trihydroxy-9- (3, 5-dibromo-hydroxyphenyl ) fluorone (DBHPF) and emulsify ing agent p-octylpolyethyIenglycol phenylether react to form a complex. Its constituent is es tablished by the method of isomolar ccntinuous varitaion and molar ratio as Zr(Ⅳ ): DBHPF = 1: 4, its maximum excitation wavelength is 527. 2 nm,and the maxiumu emission wave length is 557. 9 nm. The linear range of Zr (Ⅳ ) is 100μg/L with the detection limit of 2μg/L. The method is selective and highly sensitive for zirconium. This method has been applied to the determination of trace zirconium in melt cast Al2O3 and porcelainglaz samples.