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Effect of cationic micelles on the fluorescence of the zirconium—morin complex

✍ Scribed by Ying-Xin Fan; Yong-Xi Zheng

Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
711 KB
Volume
281
Category
Article
ISSN
0003-2670

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✦ Synopsis

The effect of cationic surfactants on the fluorescence of the zirconium-morin system is described. In sulphuric acid medium, the fluorescence intensity of this complex can be enhanced strongly by the cationic surfactant cetyltrimethylammonium bromide (CTAB). It was found that the decisive factor is the change in the composition of the analyte complex in the presence of CTAB. When the concentration of CIAB is near its critical micelle concentration, the absorptiometric measurement is favoured by the formation of a 1: 3 [Zr(IV) : morin] complex. On increasing the CTAB concentration, a mixed-liiand complex with the composition of Zr(IV) : morin : SOi-= 1: 1: 2 is formed, and the fluorescence intensity is enhanced dramatically. The role of CTAB in the formation of the mixed-ligand complex and the enhancement of the fluorescence is discussed.

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