双波长双峰值比光度法测定三元配合物组成比的研究——Al^(3+)-CAS-CTMAB体系的组成比  

Study on Determining the Composition of Ternary Complex (Al-CAS-CTMAB) with the Ratio of Double Peak Values at Double Wavelengths by UV Spectrophotometry

作　　者：张霖霖[1] 郑文芝[1] 林锦威[1] 曾维[1] 

机构地区：[1]广州大学(麓湖校区)生化学院轻化系,广东广州510091

出　　处：《光谱学与光谱分析》2006年第3期529-531,共3页Spectroscopy and Spectral Analysis

基　　金：广州大学科研资金资助项目

摘　　要：采用双波长双峰值比的新方法,对三元配合物Al-CAS-CTMAB体系的组成比的测定进行了研究。首先用该法确定二元配合物的组成比Al∶CAS为1∶2,再以Al-CAS为参比(作显色剂),测定三元配合物Al-CAS-CTMAB中的CAS与CTMAB(或Al与CTMAB)之比为1∶1(1∶2),所以Al∶CAS∶CTMAB为1∶2∶2。与传统方法测定值一致,获得了满意的结果。进一步拓宽了计算公式的适用范围,确立了测定三元配合物组成比的新方法。其中CAS为络天青S(Chromeazurols)。In the present paper, the composition of complex Al-CAS-CTMAB was studied with the ratio of double peak values at dual-wavelengths by UV spectrophotometry. First, the composition of complex of Al-CAS was determined in this method, Al：CAS=1：2. The absorption of ternary complex（Al-CAS-CTMAB） was determined with reference reagent of the complex Al-CAS. The ε values of Al-CAS and Al-CAS-CTMAB were determined with water reference. The composition of complex Al （CAS）n1 （CTMAB）n2 was calculated with the formula：N=n1/n2=（△A2ε^MRλ1-△A1ε^MRλ2）/（△A2ε^Rλ1-△A1ε^MRλ2） CAS： CTMAB= 1 ：1 ; Al：CAS：CTMAB= 1 ： 2： 2. The calculated value and that obtained by traditional method are agreeable. The method is reliable for determining composition of ternary complexes.

关 键 词：双峰值比 三元配合物组成 双波长光度法 

分 类 号：O657.3[理学—分析化学]