ASTM D5351-93(2021)

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: D5351 − 93 (Reapproved 2021)
Standard Test Method for
Determination of Organically Combined Sulfuric Anhydride
by Extraction Titration, Test Method B
This standard is issued under the fixed designation D5351; 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 2.2 Other Document:
ALCA Method H-43 Organically Combined Sulfuric Anhy-
1.1 This test method covers the determination of the organi-
dride Extraction Titration Test (for Sulfated Oils)
cally combined sulfuric anhydride existing in a sample of
sulfated oil by extracting the undecomposed sulfated fat and
3. Significance and Use
other fatty matter over an acidulated, concentrated salt
3.1 This test method is intended for the determination of
solution, boiling the residue with sulfuric acid after evaporat-
organically combined sulfuric anhydride in sulfated oils.
ing the solvent, and titrating the products of reaction. This test
method is applicable only to sulfated oils that split off their
4. Apparatus
combined SO upon boiling with mineral acids, including
4.1 The apparatus required consists of a glass flask provided
samples containing sodium acetate or other compounds that
with a glass stopper and an air condenser. The connection
cannot be accurately titrated in water solution with methyl
between the flask and the condenser shall be a ground joint.
orange as the indicator.This test method was derived fromTest
Perforated glass beads shall be used to prevent bumping.
Methods D500, Sections 20 through 24, and ALCA Method
4.1.1 Flask, an Erlenmeyer flask (Fig. 1) made of borosili-
H-43.
cate glass, having a capacity of approximately 300 mL, and
1.2 The values stated in SI units are to be regarded as the
provided with a glass stopper.
standard. The values given in parentheses are provided for
4.1.2 Condenser—The condenser required consists of a
information only.
glass tube, 915 mm (36 in.) in length, and 8 mm ( ⁄16 in.) in
1.3 This standard does not purport to address all of the
outside diameter. The lower end of the tube shall be flared and
safety concerns, if any, associated with its use. It is the
ground to fit the mouth of the Erlenmeyer flask.
responsibility of the user of this standard to establish appro-
4.1.3 Glass Beads, perforated glass beads, made of chemi-
priate safety, health, and environmental practices and deter- 5
cally resistant glass, approximately 4 mm ( ⁄32 in.) in diameter.
mine the applicability of regulatory limitations prior to use.
Before using, the glass beads shall be boiled thoroughly in
1.4 This international standard was developed in accor-
several portions of water or until the wash water reacts neutral
dance with internationally recognized principles on standard-
to methyl orange indicator.
ization established in the Decision on Principles for the
5. Reagents
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
5.1 Ethyl Ether:
Barriers to Trade (TBT) Committee.
5.2 Methyl Orange Indicator Solution (1 g/L)—Dissolve
0.1 g of methyl orange in 100 mL of water.
2. Referenced Documents
5.3 Sodium Chloride (NaCl), solid.
2.1 ASTM Standards:
D500 Test Methods of ChemicalAnalysis of Sulfonated and
5.4 Sodium Hydroxide, Standard Solution (1 N)—
Sulfated Oils
Accurately prepare and standardize a 1 N sodium hydroxide
(NaOH) solution. Express the strength or concentration of the
solution as milligrams of KOH per millilitre; 1 mL of 1 N
This test method is under the jurisdiction ofASTM Committee D31 on Leather
NaOH solution is equivalent to 56.1 mg of KOH.
and is the direct responsibility of Subcommittee D31.08 on Fats and Oils
Current edition approved Dec. 1, 2021. Published January 2022. Originally
5.5 Sodium Hydroxide, Standard Solution (0.5 N)—
approved in 1993. Last previous edition approved in 2017 as D5351 – 93 (2017).
Accurately prepare and standardize a 0.5 N NaOH solution.
DOI: 10.1520/D5351-93R21.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on Available fromAmerican Leather ChemistsAssn., Texas Tech University, P.O.
the ASTM website. Box 45300, Lubbo
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