ASTM D5562-95
(Test Method)Standard Test Method for Determination of the Acidity as Free Fatty Acids/Acid Number in the Presence of Ammonium or Triethanolamine Soaps
Standard Test Method for Determination of the Acidity as Free Fatty Acids/Acid Number in the Presence of Ammonium or Triethanolamine Soaps
SCOPE
1.1 This test method covers determination of the acidity as free fatty acids in the presence of ammonium or triethanolamine soaps, or both, existing in a sample of sulfonated or sulfated oil, or both, by calculation from the total alkalinity and free-and-alkali combined fatty acids.
1.2 The values 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 5562 – 95
Standard Test Method for
Determination of the Acidity as Free Fatty Acids/Acid
Number in the Presence of Ammonium or Triethanolamine
Soaps
This standard is issued under the fixed designation D 5562; 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
1.1 This test method covers determination of the acidity as
free fatty acids in the presence of ammonium or triethanola-
mine soaps, or both, existing in a sample of sulfonated or
sulfated oil, or both, by calculation from the total alkalinity and
free-and-alkali combined fatty acids.
1.2 The values 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 appro-
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
2. Referenced Documents
2.1 ASTM Standards:
D 5350 Test Method for Determination of Organically
Combined Sulfuric Anhydride by Titration, Test Method
A
FIG. 1 Apparatus for Determination of Organically Combined
Sulfuric Anhydride, Method A
3. Significance and Use
3.1 This test method is intended for use in the determination
4.1.3 Glass Beads—Perforated glass beads, made of chemi-
of the acid number of sulfonated and sulfated oils for the
cally resistant glass, approximately 4 mm ( ⁄32 in.) in diameter.
purpose of quality assurance.
Before using, the glass beads shall be boiled thoroughly in
several portions of water or until the wash water reacts neutral
4. Apparatus
to a methyl orange indicator.
4.1 The apparatus required consists of a glass flask provided
5. Reagents
with a glass stopper and an air condenser. The connection
between the flask and the condenser shall be a ground joint.
5.1 Ethyl Ether.
Perforated glass beads shall be used to prevent bumping.
5.2 Methyl Orange Indicator Solution (1 g/L)—Dissolve
4.1.1 Flask—An Erlenmeyer flask (Fig. 1) made of a
0.1 g of methyl orange in 100 mL of water.
borosilicate glass, having a capacity of approximately 300 mL
5.3 Sodium Chloride (NaCl), solid.
and provided with a glass stopper.
5.4 Sodium Hydroxide, Standard Solution (1 N)—
4.1.2 Condenser, consisting of a glass tube, 915 mm (36 in.)
Accurately prepare and standardize a 1 N sodium hydroxide
in length and 8 mm ( ⁄16 in.) in outside diameter. The lower end
(NaOH) solution. Express the strength or concentration of the
of the tube shall be flared and ground to fit the mouth of the
solution as mg of KOH per mL; 1 mL of 1 N NaOH solution
Erlenmeyer flask.
is equivalent to 56.1 mg of KOH.
5.5 Sodium Hydroxide, Standard Solution (0.5 N)— Accu-
rately prepare and standardize a 0.5 N NaOH solution. Express
This test method is under the jurisdiction of ASTM Committee D-31 on Leather
the strength of the solution as mg of KOH per mL; 1 mL of 0.5
and is the direct responsibility of Subcommittee D31.08 on Fats and Oils. This test
method was developed in cooperation with the American Leather Chemists Assn.
N NaOH solution is equivalent to 28.05 mg of KOH.
(Method H 52-1956).
5.6 Sulfuric Acid, Standard (0.5 N)—Accurately prepare
Current edition approved May 15, 1995. Published July 1995. Originally
and standardize a 0.5 N sulfuric acid (H SO ) solution. Express
published as D 5562 – 94. Last previous edition D 5562 – 94. 2 4
Annual Book of ASTM Standards
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