ASTM D5559-95(2023)
(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
SIGNIFICANCE AND USE
2.1 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.
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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
General Information
Relations
Standards Content (Sample)
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D5559 − 95 (Reapproved 2023)
Standard Test Method for
Determination of Acidity as Free Fatty Acids/Acid Number in
the Absence of Ammonium or Triethanolamine Soaps in
1
Sulfonated and Sulfated Oils
This standard is issued under the fixed designation D5559; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope 3.3 Sodium Hydroxide, Standard Solution (0.5 N)—
Prepare and standardize a 0.5 N solution of sodium hydroxide
1.1 This test method covers the determination of the acidity
(NaOH). Potassium hydroxide (KOH) may be substituted for
as free fatty acids existing in a sample of sulfonated or sulfated
NaOH.
oil, or both, by titrating the sample dissolved in a solvent. It is
not applicable in the presence of ammonium or triethanolamine
4. Procedure
soaps or salts or other compounds that do not react neutral to
4.1 The procedure consists of titrating a solution of the
phenolphthalein when dissolved in alcohol.
sample in a mixture of alcohol and ether in the presence of
1.2 The values stated in SI units are to be regarded as
phenolphthalein indicator. Dissolve 10 g of the sample in an
standard. No other units of measurement are included in this
alcohol-ether mixture, add five drops of phenolphthalein indi-
standard.
cator solution, and titrate the solution with 0.5 N NaOH or
1.3 This standard does not purport to address all of the
KOH solution until the pink color persists after vigorous
safety concerns, if any, associated with its use. It is the
shaking.
responsibility of the user of this standard to establish appro-
priate safety, health, and environmental practices and deter- 5. Calculation
mine the applicability of regulatory limitations prior to use.
5.1 Calculate the acidity as free fatty acids, as follows:
1.4 This international standard was developed in accor-
K 5 ~C × E!/W (1)
dance with internationally recognized principles on standard-
or
ization established in the Decision on Principles for the
% free fatty acids 5 0.503 × K (2)
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
where:
Barriers to Trade (TBT) Committee.
K = acid number, mg of KOH/g,
C = mL of NaOH or KOH solution required for titration of
2. Significance and Use
the sample,
2.1 This test method is intended for use in the determination
E = strength of NaOH or KOH solution, mg of KOH/mL,
of the acidity as free fatty acids in the absence of ammonium
and
or triethanolamine soaps in sulfonated and sulfated
...
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