ASTM D5768-02

Standard Test Method for Determination of Iodine Value of Tall Oil Fatty Acids

SCOPE
1.1 This test method covers the Wijs procedure for determination of unsaturation (iodine value) of tall oil fatty acids.
1.2 Iodine value is a measure of the unsaturation of oils and fatty acids and is expressed in terms of the number of centigrams of iodine per gram of sample (weight percent of absorbed iodine).
1.3 When this test method is used to determine the iodine value of fatty acids having conjugated systems, the result is not a measure of total unsaturated, but rather is an empirical value that affords a comparison of unsaturation. Total unsaturation of conjugated systems may be measured in accordance with Test Method D 1541.
1.4 The test method described here is not reliable for tall oil fatty acids containing an appreciable quantity of rosin.
1.5 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.

General Information

• Status: Historical
• Publication Date: 09-Dec-2002
• ICS: 87.060.20 - Binders
• Technical Committee: D01 - Paint and Related Coatings, Materials, and Applications
• Drafting Committee: D01.34 - Pine Chemicals and Hydrocarbon Resins

Relations

• Replaces: ASTM D5768-95 - Standard Test Method for Determination of Iodine Value of Tall Oil Fatty Acids
• Effective Date: 10-Dec-2002
• Replaced By: ASTM D5768-02(2006) - Standard Test Method for Determination of Iodine Value of Tall Oil Fatty Acids
• Effective Date: 01-Nov-2006

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:D5768–02
Standard Test Method for
1
Determination of Iodine Value of Tall Oil Fatty Acids
This standard is issued under the fixed designation D 5768; 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 quently a measure of the ease of oxidation or drying capacity
of that fatty acid product.
1.1 This test method covers the Wijs procedure for deter-
3.2 This test method measures the unsaturation as iodine
mination of unsaturation (iodine value) of tall oil fatty acids.
value by addition of an iodine/chlorine reagent. The amount of
1.2 Iodine value is a measure of the unsaturation of oils and
reagent absorbed is determined by back titrating the excess
fatty acids and is expressed in terms of the number of
reagent and comparing it to a blank determination.
centigrams of iodine per gram of sample (weight percent of
3.3 In samples containing conjugated double bonds, the
absorbed iodine).
iodine value obtained is empirical since the reagent does not
1.3 When this test method is used to determine the iodine
react stoichiometrically with conjugated unsaturation. Where
value of fatty acids having conjugated systems, the result is not
no conjugation is present, the iodine value obtained is a
a measure of total unsaturated, but rather is an empirical value
measure of the total unsaturation. By using proper specimen
that affords a comparison of unsaturation.Total unsaturation of
weights, the empirical values obtained are useful for compara-
conjugated systems may be measured in accordance with Test
tive purposes.
Method D 1541.
3.4 This test method was developed in order to replace the
1.4 The test method described here is not reliable for tall oil
hazardous solvent, carbon tetrachloride, used in Test Method
fatty acids containing an appreciable quantity of rosin.
D 1959 with the less hazardous and more available solvents,
1.5 This standard does not purport to address all of the
iso-octane and cyclohexane. As data on the satisfactory use of
safety concerns, if any, associated with its use. It is the
other solvents becomes available, this test method will be
responsibility of the user of this standard to establish appro-
amended to include those solvents.
priate safety and health practices and determine the applica-
3.5 This test method should have applicability to fatty acids
bility of regulatory limitations prior to use.
and oils other than tall oil fatty acid but that possibility has not
2. Referenced Documents
been investigated.
2.1 ASTM Standards:
4. Apparatus
2
D 1193 Specification for Reagent Water
4.1 Bottles—Glass-stoppered bottles or Erlenmeyer flasks
D 1541 Test Method for Total Iodine Value of Drying Oils
3 of 250-mL capacity.
and Their Derivatives
4.2 Pipets—20 and 25-mL capacity.
D 1959 Test Method for Iodine Value of Drying Oils and
3 4.3 Analytical balance
Fatty Acids
E 177 Practice for Use of the Terms Precision and Bias in
5. Reagents
4
ASTM Test Methods
5.1 Purity of Reagents—Reagent grade chemicals shall be
E 691 Practice for Conducting an Interlaboratory Study to
4 used in all tests unless otherwise specified. Unless otherwise
Determine the Precision of a Test Method
indicated, it is intended that all reagents shall conform to the
3. Significance and Use Specifications of the Committee onAnalytical Reagents of the
American Chemical Society, where such specifications are
3.1 The iodine value of a fatty acid product is a measure of
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available. Other grades may be used provided it is first
the unsaturated fatty acid content of that product and conse-
1
This test method is under the jurisdiction of ASTM Committee D01 on Paint
and Related Coatings, Materials, andApplications and is the direct responsibility of
5
Subcommittee D01.34 on Naval Stores. Reagent Chemicals, American Chemical Society Specifications, American
Current edition approved Dec. 10, 2002. Published February 2003. Originally Chemical Society, Washington, DC. For suggestions on the testing of reagents not
approved in 1995. Last previous edition approved in 1995 as D 5768 - 95. listed by the American Chemical Society, see Analar Standards for Laboratory
2
Annual Book of ASTM Standards, Vol 11.01. Chemicals, BDH Ltd., Poole, Dorset, U.K., and the United States Pharmacopeia
3
Annual Book of ASTM Standards, Vol 06.03. and National Formulary, U.S. Pharmacopeial Convention, Inc. (USPC), Rockville,
4
Annual Book of ASTM Standards, Vol 14.02. MD.
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