Titrimetric determination of soap in refined vegetable oils

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Abstract
The low levels of soap encountered in well refined vegetable oils can be determined quickly and accurately in an isopropyl alcohol solution of the oil by a direct titration with .01 N hydrochloric acid in isopropyl alcohol using bromophenol blue as the indicator. Fifty parts per million soap calculated as sodium oleate can be determined with good accuracy and as little as 2 ppm can be detected in refined and bleached soybean oil. Soap in palm oil can be determined using the same solvent and titrant and titrating the sample to pH 5.0.

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