ASTM D5559-95(2001)
(Test Method)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
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.
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Designation: D 5559 – 95 (Reapproved 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
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
notapplicableinthepresenceofammoniumortriethanolamine 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-
bility of regulatory limitations prior to use or
% free fatty acids 5 0.503 3 K (2)
2. Significance and Use
2.1 This test method is intended for use in the determination
where:
of the acidity as free fatty acids in the absence of ammonium
K = acid number, mg of KOH/g,
or triethanolamine soaps in sulfonated and sulfated oils for the
C = mL of NaOH or KOH solution required for titration
purpose of quality assurance.
of the sample,
E = strength of NaOH or KOH solution, mg of KOH/mL,
3. Apparatus and Reagents
and
3.1 Alcohol-Ether Mixture—Mix 50 mL of neutral alcohol
W = weight of sample, g.
with 25 mL of ether.
3.2 Phenolphthalein Indicator Solution (10 g/L)—Dissolve
6. Precision and Bias
1 g of phenolphthalein in 100 mL of ethanol (95 %).
6.1 This test method is adopte
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