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《Chinese Journal of Analytieal Chemistry》 1995-07
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Study on the Chromogenic Reaction of Quaternary Ammonium Surfactants With (p-Nitrophenylazo)-resorcinol and Their Analytical Applications

Yang Wenchu (Department of Chemistry, Xuzhou Medical College, Xuzhou 221002)Zhou Huafang (Department of Chemistry, Xuzhou Teachers' College)  
The mechanism, characteristics and analytical applications of the chromogenic reaction of (p-nitrophenylazo)-resorcinol (PNPAR) with cetylpyridinium bromide(CPB) or cetyltrimethylammonium bromide (CTMAB) were investigated. Both single molecular and micelle of surfactant could cause the equivalent red shift of the absorption spectrum of PNPAR. Their association ratio with PNPAR was 2 : 1. The influences of single molecular and micelle on pKa2 and εmax of PNPAR were different. Based on this chromogenic reaction, the critical micelle concentration of CPB and CTMAB was determined, and the possibility for the determination of trace CPB and CTMAB was proposed.
【Key Words】: Cetylpyridinium bromide cetyltrimethylammonium bromide (p-nitropheny-lazo)-resorcinol chromogenic reaction
【CateGory Index】: O657.3
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