ASTM D2086-08
(Test Method)Standard Test Method for Acidity in Vinyl Acetate and Acetaldehyde
Standard Test Method for Acidity in Vinyl Acetate and Acetaldehyde
SIGNIFICANCE AND USE
This test method provides a measurement of total acidity in vinyl acetate and acetaldehyde. The results of these measurements can be used for specification acceptance.
SCOPE
1.1 This test method covers the determination of total acidity as acetic acid in refined vinyl acetate and acetaldehyde.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.3 For purposes of determining conformance of an observed value or a calculated value using this test method to relevant specifications, test result(s) shall be rounded off “to the nearest unit” in the last right-hand digit used in expressing the specification limit, in accordance with the rounding-off method of Practice E 29.
1.4 For hazard information and guidance, see the supplier's Material Safety Data Sheet.
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. For specific hazard statements, see Section 8.
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Designation: D2086 − 08
StandardTest Method for
1
Acidity in Vinyl Acetate and Acetaldehyde
This standard is issued under the fixed designation D2086; 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* at reduced temperature with aqueous sodium hydroxide solu-
tion to a phenolphthalein end point.
1.1 This test method covers the determination of total
acidity as acetic acid in refined vinyl acetate and acetaldehyde.
4. Significance and Use
1.2 The values stated in SI units are to be regarded as
4.1 Thistestmethodprovidesameasurementoftotalacidity
standard. No other units of measurement are included in this
in vinyl acetate and acetaldehyde. The results of these mea-
standard.
surements can be used for specification acceptance.
1.3 For purposes of determining conformance of an ob-
5. Interferences
served value or a calculated value using this test method to
relevant specifications, test result(s) shall be rounded off “to
5.1 Any material or contaminant that will react with NaOH
the nearest unit” in the last right-hand digit used in expressing
under the test conditions will affect the results.
the specification limit, in accordance with the rounding-off
5.2 Vinyl acetate will decompose on storage, typically by
method of Practice E29.
way of hydrolysis, to form acetic acid.
1.4 For hazard information and guidance, see the supplier’s
5.3 Acetaldehydewillreactwithoxygen,eitherdissolvedor
Material Safety Data Sheet.
in a storage container, to form acetic acid.
1.5 This standard does not purport to address all of the
5.4 Various acids or other acidic materials may be present.
safety concerns, if any, associated with its use. It is the
Common practice, including the method used here, calculates
responsibility of the user of this standard to establish appro-
these as acetic acid. The actual weight percent of acidic
priate safety and health practices and determine the applica-
materials may be different.
bility of regulatory limitations prior to use. For specific hazard
statements, see Section 8.
6. Apparatus
6.1 Buret, 10-mL, graduated in 0.05-mL subdivisions.
2. Referenced Documents
2
6.2 Erlenmeyer Flask, 250-mL capacity.
2.1 ASTM Standards:
D1193 Specification for Reagent Water
6.3 Graduated Cylinder, 50 or 100-mL capacity.
E29 Practice for Using Significant Digits in Test Data to
6.4 Cold Bath, maintained at 0°C or below.
Determine Conformance with Specifications
E200 Practice for Preparation, Standardization, and Storage
7. Reagents
of Standard and Reagent Solutions for ChemicalAnalysis
7.1 Purity of Reagents—Reagent grade chemicals shall be
used in all tests. Unless otherwise indicated, it is intended that
3. Summary of Test Method
all reagents shall conform to the specifications of the Commit-
3.1 The specimen is mixed with either an equal volume of
tee onAnalytical Reagents of theAmerican Chemical Society,
chilled water or an equal volume of ethyl alcohol and titrated
3
where such specifications are available. Other grades may be
used, provided it is first ascertained that the reagent is of
sufficiently high purity to permit its use without lessening the
1
This test method is under the jurisdiction of ASTM Committee D01 on Paint
accuracy of the determination.
and Related Coatings, Materials, andApplications and is the direct responsibility of
Subcommittee D01.35 on Solvents, Plasticizers, and Chemical Intermediates.
Current edition approved Nov. 1, 2008. Published November 2008. Originally
3
approved in 1962. Last previous edition approved in 2003 as D2086 – 03. DOI: Reagent Chemicals, American Chemical Society Specifications, American
10.1520/D2086-08. Chemical Society, Washington, DC. For suggestions on the testing of reagents not
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or listed by the American Chemical Society, see Analar Standards for Laboratory
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Chemicals, BDH Ltd., Poole, Dorset, U.K., and the United States Pharmacopeia
Standards volume information, refer to the standard’s Document Summary page on and National Formulary, U.S. Pharmacopeial Convention, Inc. (USPC), Rockville,
the ASTM website. MD.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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D2086 − 08
NOTE 4—Titration at low temperature avoids interference and is
7.2 Purity of Water—Unless otherwise indicated, references
required because of the low boil
...
This document is not anASTM standard and is intended only to provide the user of anASTM 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:D2086–03 Designation: D 2086 – 08
Standard Test Method for
1
Acidity in Vinyl Acetate and Acetaldehyde
This standard is issued under the fixed designation D 2086; 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 determination of total acidity as acetic acid in refined vinyl acetate and acetaldehyde.
1.2The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.3 For purposes of determining conformance of an observed value or a calculated value using this test method to relevant
specifications, test result(s) shall be rounded off “to the nearest unit” in the last right-hand digit used in expressing the specification
limit, in accordance with the rounding-off method of Practice E 29.
1.4 For hazard information and guidance, see the supplier’s Material Safety Data Sheet.
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. For specific hazard statements, see Section 8.
2. Referenced Documents
2
2.1 ASTM Standards:
D 1193 Specification for Reagent Water
E 29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
E 200 Practice for Preparation, Standardization, and Storage of Standard and Reagent Solutions for Chemical Analysis
3. Summary of Test Method
3.1 The specimen is mixed with either an equal volume of chilled water or an equal volume of ethyl alcohol and titrated at
reduced temperature with aqueous sodium hydroxide solution to a phenolphthalein end point.
4. Significance and Use
4.1 This test method provides a measurement of total acidity in vinyl acetate and acetaldehyde. The results of these
measurements can be used for specification acceptance.
5. Interferences
5.1 Any material or contaminant that will react with NaOH under the test conditions will affect the results.
5.2 Vinyl acetate will decompose on storage, typically by way of hydrolysis, to form acetic acid.
5.3 Acetaldehyde will react with oxygen, either dissolved or in a storage container, to form acetic acid.
5.4 Various acids or other acidic materials may be present. Common practice, including the method used here, calculates these
as acetic acid. The actual weight percent of acidic materials may be different.
6. Apparatus
6.1 Buret, 10-mL, graduated in 0.05-mL subdivisions.
6.2 Erlenmeyer Flask, 250-mL capacity.
6.3 Graduated Cylinder, 50 or 100-mL capacity.
6.4 Cold Bath, maintained at 0°C or below.
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 D01.35 on Solvents, Plasticizers, and Chemical Intermediates .
Current edition approved Oct.Nov. 1, 2003.2008. Published October 2003.November 2008. Originally approved in 1962. Last previous edition approved in 20022003 as
D 2086 – 023.
2
Annual Book of ASTM Standards, Vol 11.01.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. ForAnnualBookofASTMStandards
volume information, refer to the standard’s Document Summary page on the ASTM website.
*A Summary of Changes section appears at the end of this standard.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
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D2086–08
7. Reagents
7.1 Purity of Reagents—Reagent grade chemicals shall be used in all tests. Unless otherwise indicated, it is intended that all
reagents shall conform to the specifications of the Committee on Analytical Reagents of the American Chemical Society, where
3
such specifications are available. Other grades may be used, provided it is first ascertained that the reagent is of sufficiently high
purity to permit its use without lessening the accuracy of the determination.
7.2 Purity of Water—Unless otherwise indicated, references to
...
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