ASTM D5559 - 95(2011)

    Standard Test Method for Determination of Acidity as Free Fatty Acids/Acid Number in the Absence of Ammonium or Triethanolamine Soaps in Sulfonated and Sulfated Oils

    Active Standard ASTM D5559 | Developed by Subcommittee: D31.08

    Book of Standards Volume: 15.04


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    Significance and Use

    This test method is intended for use in the determination of the acidity as free fatty acids in the absence of ammonium or triethanolamine soaps in sulfonated and sulfated oils for the purpose of quality assurance.

    1. Scope

    1.1 This test method covers the determination of the acidity as free fatty acids existing in a sample of sulfonated or sulfated oil, or both, by titrating the sample dissolved in a solvent. It is not applicable in the presence of ammonium or triethanolamine soaps or salts or other compounds that do not react neutral to phenolphthalein when dissolved in alcohol.

    1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

    1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.


    ICS Code

    ICS Number Code 71.080.40 (Organic acids)

    UNSPSC Code

    UNSPSC Code 12352211(Fats or lipids)


    Referencing This Standard

    DOI: 10.1520/D5559-95R11

    ASTM International is a member of CrossRef.

    Citation Format

    ASTM D5559-95(2011), Standard Test Method for Determination of Acidity as Free Fatty Acids/Acid Number in the Absence of Ammonium or Triethanolamine Soaps in Sulfonated and Sulfated Oils, ASTM International, West Conshohocken, PA, 2011, www.astm.org

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