Water titration method which is used for measuring the number of ml's of water (Water Number, or W.N.) required for making the system turbid by adding distilled water dropwise into a fixed quantity of a mixed solution of nonionic surfactant and solvent, was applied to several nonionic surfactants, such as those involving ester linkage, alkyl phenols, alkyl phenol-formalin resins and lower aromatic alcohols, and study was made for comparison of these samples. (1) Comparing the two mixed

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... DB-4 (dioxane containing 4vol% benzene) and DB-10 (dioxane containing 10vol% benzene), the end point of titration for DB-10 was sharper than that of DB-4. (2) For naerly all of the nonionic surfactants, the water number increased linearly with increase 33