Investigation of picramine CA molecular adsorption on CTMAB micelle by MPASC technique

The microphase adsorption - spectroscopic correction WASQ technique was app lied to the investigation of the interaction of picramine CA (PCA) with cet yl trimethylammonium bromide (CTMAB) micelles. ne microelectrostatic field in the micelles attracts PCA molecules into a monolayer, which is formed by twining the surfactant long carbon chains. Results showed that the product is (PCA.CTMAB)(m) at pH 6. The equilibrium constant K of the product is 1. 25 x 10(6) and its monomeric (PCA.CTMAB) molar absorptivity, epsilon, is 5. 47 x 10(3) lmol(-1)cm(-1) at 640 nm. The aggregation of PCA on CTMAB micell es is selective and suitable for the analysis of environmental water sample s.