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31P nuclear magnetic resonance (NMR) studies of the four phases (I, 11, 11' and 111) in the barium ethyl octyl phosphatewater system were carried out. The concentration dependence of the 31P chemical shift, half-height width and line shape provided information on the phase structures. For phase I the critical micelle concentration (CMC) is found at 1.2 wt.%, and above this concentration there is a monomer micelle equilibrium. Phase I1 has a monomer e micelle equilibrium system, similar to phase I. Phase II' is an aggregate system and is structurally organized. The structure of phase I11 is more organized than that of phase 11' and depends strongly on concentration. The 3J(POCC) values were also 4 to establish the restricted state of the PO-CC single bond in the Ph-

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