ASTM D5768-02(2014)

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

SIGNIFICANCE AND USE
3.1 The iodine value of a fatty acid product is a measure of the unsaturated fatty acid content of that product and consequently a measure of the ease of oxidation or drying capacity of that fatty acid product.  
3.2 This test method measures the unsaturation as iodine value by addition of an iodine/chlorine reagent. The amount of reagent absorbed is determined by back titrating the excess reagent and comparing it to a blank determination.  
3.3 In samples containing conjugated double bonds, the iodine value obtained is empirical since the reagent does not react stoichiometrically with conjugated unsaturation. Where no conjugation is present, the iodine value obtained is a measure of the total unsaturation. By using proper specimen weights, the empirical values obtained are useful for comparative purposes.  
3.4 This test method was developed in order to replace the hazardous solvent, carbon tetrachloride, used in Test Method D1959 with the less hazardous and more available solvents, iso-octane and cyclohexane. As data on the satisfactory use of other solvents becomes available, this test method will be amended to include those solvents.  
3.5 This test method should have applicability to fatty acids and oils other than tall oil fatty acid but that possibility has not been investigated.
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 D1541.  
1.4 The test method described here is not reliable for tall oil fatty acids containing an appreciable quantity of rosin.  
1.5 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.  
1.6 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: 30-Nov-2014
• ICS: 87.060.20 - Binders
• Technical Committee: D01 - Paint and Related Coatings, Materials, and Applications
• Drafting Committee: D01.34 - Pine Chemicals and Hydrocarbon Resins

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 (Reapproved 2014)
Standard Test Method for
1
Determination of Iodine Value of Tall Oil Fatty Acids
This standard is issued under the fixed designation D5768; 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 E177 Practice for Use of the Terms Precision and Bias in
ASTM Test Methods
1.1 This test method covers the Wijs procedure for deter-
E691 Practice for Conducting an Interlaboratory Study to
mination of unsaturation (iodine value) of tall oil fatty acids.
Determine the Precision of a Test Method
1.2 Iodine value is a measure of the unsaturation of oils and
fatty acids and is expressed in terms of the number of 3. Significance and Use
centigrams of iodine per gram of sample (weight percent of
3.1 The iodine value of a fatty acid product is a measure of
absorbed iodine).
the unsaturated fatty acid content of that product and conse-
1.3 When this test method is used to determine the iodine
quently a measure of the ease of oxidation or drying capacity
value of fatty acids having conjugated systems, the result is not of that fatty acid product.
a measure of total unsaturated, but rather is an empirical value
3.2 This test method measures the unsaturation as iodine
that affords a comparison of unsaturation.Total unsaturation of
value by addition of an iodine/chlorine reagent. The amount of
conjugated systems may be measured in accordance with Test
reagent absorbed is determined by back titrating the excess
Method D1541.
reagent and comparing it to a blank determination.
1.4 The test method described here is not reliable for tall oil
3.3 In samples containing conjugated double bonds, the
fatty acids containing an appreciable quantity of rosin.
iodine value obtained is empirical since the reagent does not
1.5 The values stated in SI units are to be regarded as the
react stoichiometrically with conjugated unsaturation. Where
standard. The values given in parentheses are for information no conjugation is present, the iodine value obtained is a
only. measure of the total unsaturation. By using proper specimen
weights, the empirical values obtained are useful for compara-
1.6 This standard does not purport to address all of the
tive purposes.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
3.4 This test method was developed in order to replace the
priate safety and health practices and determine the applica-
hazardous solvent, carbon tetrachloride, used in Test Method
bility of regulatory limitations prior to use.
D1959 with the less hazardous and more available solvents,
iso-octane and cyclohexane. As data on the satisfactory use of
2. Referenced Documents
other solvents becomes available, this test method will be
2
2.1 ASTM Standards: amended to include those solvents.
D1193 Specification for Reagent Water
3.5 This test method should have applicability to fatty acids
D1541 Test Method for Total Iodine Value of Drying Oils
and oils other than tall oil fatty acid but that possibility has not
3
and Their Derivatives (Withdrawn 2006)
been investigated.
D1959 Test Method for Iodine Value of Drying Oils and
3
Fatty Acids (Withdrawn 2006)
4. Apparatus
4.1 Bottles—Glass-stopperedbottlesorErlenmeyerflasksof
1 250-mL capacity.
This test method is under the jurisdiction of ASTM Committee D01 on Paint
and Related Coatings, Materials, andApplications and is the direct responsibility of
4.2 Pipets—20 and 25-mL capacity.
Subcommittee D01.34 on Pine Chemicals and Hydrocarbon Resins.
Current edition approved Dec. 1, 2014. Published December 2014. Originally
4.3 Analytical balance
approved in 1995. Last previous edition approved in 2010 as D5768 – 02 (2010).
DOI: 10.1520/D5768-02R14.
5. Reagents
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
5.1 Purity of Reagents—Reagent grade chemicals shall be
Standards volume information, refer to the standard’s Document Summary page on
used in all tests unless otherwise specified. Unless otherwise
the ASTM website.
3
indicated, it is intended that all reagents shall conform to the
The last approved version of this historical standard is referenced on
www.astm.org. Specifications of the Committee onAnalytical Reagents of the
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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D5768 − 02 (2014)
American Chemical Society, where such specifications are N 5 A 320.39 /C
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: D5768 − 02 (Reapproved 2010) D5768 − 02 (Reapproved 2014)
Standard Test Method for
1
Determination of Iodine Value of Tall Oil Fatty Acids
This standard is issued under the fixed designation D5768; 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
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 D1541.
1.4 The test method described here is not reliable for tall oil fatty acids containing an appreciable quantity of rosin.
1.5 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.6 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.
2. Referenced Documents
2
2.1 ASTM Standards:
D1193 Specification for Reagent Water
3
D1541 Test Method for Total Iodine Value of Drying Oils and Their Derivatives (Withdrawn 2006)
3
D1959 Test Method for Iodine Value of Drying Oils and Fatty Acids (Withdrawn 2006)
E177 Practice for Use of the Terms Precision and Bias in ASTM Test Methods
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
3. Significance and Use
3.1 The iodine value of a fatty acid product is a measure of the unsaturated fatty acid content of that product and consequently
a measure of the ease of oxidation or drying capacity of that fatty acid product.
3.2 This test method measures the unsaturation as iodine value by addition of an iodine/chlorine reagent. The amount of reagent
absorbed is determined by back titrating the excess reagent and comparing it to a blank determination.
3.3 In samples containing conjugated double bonds, the iodine value obtained is empirical since the reagent does not react
stoichiometrically with conjugated unsaturation. Where no conjugation is present, the iodine value obtained is a measure of the
total unsaturation. By using proper specimen weights, the empirical values obtained are useful for comparative purposes.
3.4 This test method was developed in order to replace the hazardous solvent, carbon tetrachloride, used in Test Method D1959
with the less hazardous and more available solvents, iso-octane and cyclohexane. As data on the satisfactory use of other solvents
becomes available, this test method will be amended to include those solvents.
3.5 This test method should have applicability to fatty acids and oils other than tall oil fatty acid but that possibility has not been
investigated.
1
This test method is under the jurisdiction of ASTM Committee D01 on Paint and Related Coatings, Materials, and Applications and is the direct responsibility of
Subcommittee D01.34 on Pine Chemicals and Hydrocarbon Resins.
Current edition approved June 1, 2010Dec. 1, 2014. Published June 2010December 2014. Originally approved in 1995. Last previous edition approved in 20062010 as
D5768 – 02 (2006).(2010). DOI: 10.1520/D5768-02R10.10.1520/D5768-02R14.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’sstandard’s Document Summary page on the ASTM website.
3
The last approved version of this historical standard is referenced on www.astm.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
D5768 − 02 (2014)
4. Apparatus
4.1 Bottles—Glass-stoppered bottles or Erlenmeyer flasks of 250-mL capacity.
4.2 Pipets—20 an
...