ASTM D5559-95

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

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 the 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.

General Information

• Status: Historical
• Publication Date: 14-May-1995
• Technical Committee: D31 - Leather
• Drafting Committee: D31.08 - Fats and Oils

Relations

• Replaced By: ASTM D5559-95(2001) - 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
• Effective Date: 15-May-1995

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: D 5559 – 95
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
This standard is issued under the fixed designation D 5559; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope 4. Procedure
1.1 This test method covers the determination of the acidity 4.1 The procedure consists of titrating a solution of the
as free fatty acids existing in a sample of sulfonated or sulfated sample in a mixture of alcohol and ether in the presence of
oil, or both, by titrating the sample dissolved in a solvent. It is phenolphthalein indicator. Dissolve 10 g of the sample in an
not applicable in the presence of ammonium or triethanolamine alcohol-ether mixture, add five drops of phenolphthalein indi-
soaps or salts or other compounds that do not react neutral to cator solution, and titrate the solution with 0.5 N NaOH or
phenolphthalein when dissolved in alcohol. KOH solution until the pink color persists after vigorous
1.2 The values stated in SI units are to be regarded as the shaking.
standard.
5. Calculation
1.3 This standard does not purport to address all of the
5.1 Calculate the acidity as free fatty acids, as follows:
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
K 5 ~C 3 E!/W (1)
priate safety and health practices and determine the applica-
or
bility of regulatory limitations prior to use
% free fatty acids 5 0.503 3 K (2)
2. Significance and Use
where:
2.1 This test method is intended for use in the determination K 5 acid number, mg of KOH/g,
C 5 mL of NaOH or KOH solution required for titration
of the acidity as free fatty acids in the absence of ammonium
of the sample,
or triethanolamine soaps in sulfonated and sulfated oils for the
E 5 strength of NaOH or KOH solution, mg of KOH/mL,
purpose of quality assurance.
and
3. Apparatus and Reagents
W 5 weight of sample, g.
3.1 Alcohol-Ether Mixture—Mix 50 mL of neutral alcohol
6. Precision and Bias
with 25 mL of ether.
6.1 This test method is adopted from the procedures of the
3.2 Phenolphthalein Indicator Solution (10 g/L)—Dissolve
American Leather Chemists Association where it
...