三元配合物显色体系测定铝

Determination of Aluminium with the Chromogenic System of Ternary Complex

本文主要研究了Al（III）-CAS—OP三元配合物显色体系。在pH=5．5的HAc-NaAc介质中，该配合物的λmax=560nm，εmax=4．8×104L．mol-1．cm-1。Al（III）量在0～3．2mg／L范围内线性关系良好，符合比尔定律，其线性回归方程为A=47833C-0．0103；相关系数r=0．9990。摩尔比法测定了该配合物配位比为1：2：4。以抗坏血酸作掩蔽剜，利用该体系测定粉条中的铝含量，回收率为91％～101％。

The chromogenic system of Al（III）-CAS-OP ternary complex was investigated. In the medium of HAc-NaAc, maximum absorb wave-length of the complex was 560 nm and εmax was 4.8×104L.mol.cm-1. Beer＇s law was obeyed for Al（III） in the range of 0-3.2 mg/L. The linear equation was A=47833C-0.0103, and the correlation coefficient was 0.990. The composition ratio of the ternary complexes was 1：2：4 by using the method of molar ratio. The Al（III） content in vermicelli was meatrued by using the system with ascorbic acid as masking agent. The recovery was 91%-106%.