Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Interaction of Indigo Carmine with Cetyltrimethylammonium Bromide and Application to Determination of Cationic Surfactant in Wastewater

  • Wang, Hong-Yan (Department of Chemistry and Biology, Suzhou Teachers College) ;
  • Gao, Hong-Wen (State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science and Engineering, Tongji University) ;
  • Zhao, Jian-Fu (State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science and Engineering, Tongji University)
  • Published : 2003.10.20
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Abstract

The microsurface adsorption - spectral correction (MSASC) technique has been applied to the interaction of indigo carmine (IC) with cetyltrimethylammonium bromide (CTAB). The aggregation of IC on CTAB obeys Langmuir isothermal adsorption. The results show that both the monomer complex $IC{\cdot}CTAB$ and the micellar complex $(IC{\cdot}CTAB)_{78}$ were formed. The binding constant of the monomer complex was calculated to be $K_{IC{\cdot}CTAB}$ = 2.20 ${\times}10^5L{\cdot}mol^{-1}$, and the molar absorptivity of the micellar complex was calculated to be ${\varepsilon}_{(IC{\cdot}CTAB)78}\;^{560nm}$ = 8.58 ${\times}10^5L{\cdot}mol^{-1}{\cdot}cm^{-1}$. The aggregation was applied to the determination of cationic surfactant in wastewater.

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