摘要
在ＣＴＡＢ胶束介质中配合物组成可发生一系列变化，这是其对吸光度及荧光增敏的决定因素．在合适的ＣＴＡＢ浓度下，可形成Ｚｒ（Ⅳ）：Ｍｏｒｉｎ＝１：３的高次配合物，使体系的摩尔吸光系数增加３倍多；但随着ＣＴＡＢ浓度的增大，形成了Ｚｒ（Ⅳ）：Ｍｏｒｉｎ：ＳＯ_４^（２－）＝１：１：２的混配配合物，硫酸根起了辅助配体的作用，荧光强度增强数十倍，稳定性也有很大提高，对ＣＴＡＢ胶束改变配合物组成及增敏荧光的原因进行了研究。据此建立了胶束增敏荧光测定锆的新方法。该法的检测下限为０．２ｎｇ／ｍＬ，线性范围为０．２ｎｇ／ｍＬ～０．５μｇ／ｍＬ，选择性、稳定性均好。
The effect of surfactants on the fluorescence of the zirconium-morin system was described In0.12 mol/L H2SO4 solution,the fluorescent intensity of this complex can be enhanced by cationic surfactant,cetyltrimethylammonium bromide(CTAB),but no effect in HCl medium.It was found that the mechanism of the effects of CTAB on the absorbance and fluorescence were different.The absorptiometric measurement was favored with the formation of 1:3(Zr(Ⅳ):morin) complex in the proper CTAB concentration(near the critical micelle concentration,cmc,of CTAB).With the CTAB concentration increasing,a mixed-ligand complex was formed,and the intensity of fluorescence was enhanced dramatically.The role of CTAB in the formation of the mixed-ligand complex and the enhancement of fluorescence was discussd.A new analytical method for the fluorometric determination of Zr(Ⅳ)was described also.The detection limits of the method is 0.2ng/mL,calculated with S/N=6.The linear range of the calibration graph was 0.2ng/mL～0.5μg/mL.The intensity of fluorescence is stable for at least 24 hours.From the study of interfering ions,it was deduced that the selectivity of the method is high,This is one of the.best system for determination of traces of zirconium.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1994年第1期35-38,共4页
Chemical Journal of Chinese Universities
基金
国家自然科学基金
关键词
阳离子胶束
荧光
桑色素
络合物
锆
Cationic micelles,Surfactants,Fluorimetry,Morin complex,Zirconium
