ASTM D5562-95(2011)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: D5562 − 95 (Reapproved 2011)
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 D5562; 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 4.1.1 Flask—An Erlenmeyer flask (Fig. 1) made of a boro-
silicate glass, having a capacity of approximately 300 mL and
1.1 This test method covers determination of the acidity as
provided with a glass stopper.
free fatty acids in the presence of ammonium or trietha-
4.1.2 Condenser, consisting of a glass tube, 915 mm (36 in.)
nolamine soaps, or both, existing in a sample of sulfonated or
in length and 8 mm ( ⁄16 in.) in outside diameter.The lower end
sulfated oil, or both, by calculation from the total alkalinity and
of the tube shall be flared and ground to fit the mouth of the
free-and-alkali combined fatty acids.
Erlenmeyer flask.
1.2 The values stated in SI units are to be regarded as
4.1.3 Glass Beads—Perforated glass beads, made of chemi-
standard.
cally resistant glass, approximately 4 mm ( ⁄32 in.) in diameter.
1.3 This standard does not purport to address all of the
Before using, the glass beads shall be boiled thoroughly in
safety concerns, if any, associated with its use. It is the
several portions of water or until the wash water reacts neutral
responsibility of the user of this standard to establish appro-
to a methyl orange indicator.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
5. Reagents
5.1 Ethyl Ether.
2. Referenced Documents
5.2 MethylOrangeIndicatorSolution(1g/L)—Dissolve 0.1
2.1 ASTM Standards:
g of methyl orange in 100 mL of water.
D5350 Test Method for Determination of Organically Com-
bined Sulfuric Anhydride by Titration, Test Method A
5.3 Sodium Chloride (NaCl), solid.
5.4 Sodium Hydroxide, Standard Solution (1 N)—
3. Significance and Use
Accurately prepare and standardize a 1 N sodium hydroxide
3.1 This test method is intended for use in the determination
(NaOH) solution. Express the strength or concentration of the
of the acid number of sulfonated and sulfated oils for the
solution as mg of KOH per mL; 1 mL of 1 N NaOH solution
purpose of quality assurance.
is equivalent to 56.1 mg of KOH.
5.5 Sodium Hydroxide, Standard Solution (0.5 N)—
4. Apparatus
Accurately prepare and standardize a 0.5 N NaOH solution.
4.1 The apparatus required consists of a glass flask provided
Express the strength of the solution as mg of KOH per mL; 1
with a glass stopper and an air condenser. The connection
mLof 0.5 N NaOH solution is equivalent to 28.05 mg of KOH.
between the flask and the condenser shall be a ground joint.
5.6 SulfuricAcid,Standard(0.5N)—Accuratelyprepareand
Perforated glass beads shall be used to prevent bumping.
standardize a 0.5 N sulfuric acid (H SO ) solution. Express the
2 4
strength of the solution as mg of KOH per mL; 1 mL of 0.5 N
This test method is under the jurisdiction ofASTM Committee D31 on Leather H SO is equivalent to 28.05 mg of KOH.
2 4
and is the direct responsibility of Subcommittee D31.08 on Fats and Oils. This test
5.7 Sulfuric Acid (1+19)—Carefully mix 1 volume of
method was developed in cooperation with the American Leather Chemists Assn.
(Method H 52-1956).
concentrated sulfuric acid (H SO , sp gr 1.84) into 19 volumes
2 4
Current edition approved Jan. 1, 2011. Published March 2011. Originally
of water while stirring.
approved in 1994. Last previous edition approved in 2006 as D5562 – 95(2006).
DOI: 10.1520/D5562-95R11.
6. Procedure
For referenced ASTM
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