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A.O.C.S. Official Method Db 2-48. This method was designed for soap in admixture with synthetic detergents, but the principle is the same when soap is not present. Soap does not dissolve in 1∶1 acetone-ethyl ether mixture, and this solvent can be employed to separate soap from surface-active agents when both are present.
Blank and Boggie, Oil & Soap,20, 125–128 (1943).
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Ross, L.U., Blank, E.W. Error in the determination of active ingredient in detergent products. J Am Oil Chem Soc 34, 70 (1957). https://doi.org/10.1007/BF02638020
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DOI: https://doi.org/10.1007/BF02638020