The phase behavior of dodecyltrimethylammonium bromide (DTAB)/sodium dodecyl sulfonate (AS)/H2O system in the presence and in the absence of sodium phosphate has been studied. Two kinds of aqueous two‐phase systems (ATPSs) were formed, one is ATPS‐A in which anionic surfactant is in excess, the other is ATPS‐C in which cationic surfactant is in excess. For the CTAB/AS/H2O system, the addition of sodium phosphate changes the extraction phenomena of both ATPS‐A and ATPS‐C. For the DTAB/AS/H2O system, the addition of sodium phosphate changes the extraction phenomena of ATPS‐C. For ATPS‐C, the addition of trivalent PO4 3− results in a strong extraction effect of ATPS‐C to cationic water‐soluble dye methylene blue.
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Nan et al. (2006) studied this question.
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