[Color reaction of cationic surfactants on bromphenol red and its analytical applications].
The suitable conditions, mechanism, characteristics and analytical applications of bromphenol red (BPR) reacting on cationic surfactants (CSAA) such as cetylpyridinium bromide (CPB) or cetyltrimetryl ammonium bromide (CTAB) were investigated. The results show that the single molecular CSAA reacts on BPR to form an ion-associate complex at pH 5.0-6.0, and its molar ratio (CSAA:BPR) is 3:2. Based on this color reaction, the critical micelle concentration (CMC) of CTAB and CPB was determined, and the possibility for the determination of trace CTAB and CPB were proposed.
Huang
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Department of Chemistry, Huaibei Coal Mining Teachers College, 235000 Huaibei.