ASTM D2086-99

Standard Test Method for Acidity in Vinyl Acetate and Acetaldehyde

SCOPE
1.1 This test method covers the determination of total acidity as acetic acid in refined vinyl acetate and acetaldehyde.  
1.2 This standard does not purport to address all of the safety problems, 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.
1.3 For hazard information and guidance, see the supplier's Material Safety Data Sheet.

General Information

• Status: Historical
• Publication Date: 09-Jun-1999
• ICS: 71.080.80 - Aldehydes and ketones
• ICS: 71.080.99 - Other organic chemicals
• Technical Committee: D01 - Paint and Related Coatings, Materials, and Applications
• Drafting Committee: D01.35 - Solvents, Plasticizers, and Chemical Intermediates

Relations

• Replaced By: ASTM D2086-02 - Standard Test Method for Acidity in Vinyl Acetate and Acetaldehyde
• Effective Date: 10-Jul-2002

Standards Content (Sample)

Designation: D 2086 – 99
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope these as acetic acid. The actual weight percent of acidic
materials may be different.
1.1 This test method covers the determination of total
acidity as acetic acid in refined vinyl acetate and acetaldehyde.
6. Apparatus
1.2 This standard does not purport to address all of the
6.1 Buret, 10-mL, graduated in 0.05-mL subdivisions.
safety concerns, if any, associated with its use. It is the
6.2 Erlenmeyer Flask, 250-mL capacity.
responsibility of the user of this standard to establish appro-
6.3 Graduated Cylinder, 50 or 100-mL capacity.
priate safety and health practices and determine the applica-
6.4 Cold Bath, maintained at 0°C or below.
bility of regulatory limitations prior to use. For specific hazard
statements, see Section 8.
7. Reagents
1.3 For hazard information and guidance, see the supplier’s
7.1 Purity of Reagents—Reagent grade chemicals shall be
Material Safety Data Sheet.
used in all tests. Unless otherwise indicated, it is intended that
2. Referenced Documents all reagents shall conform to the specifications of the Commit-
tee on Analytical Reagents of the American Chem-ical Society,
2.1 ASTM Standards:
4
2 where such specifications are available. Other grades may be
D 1193 Specification for Reagent Water
used, provided it is first ascertained that the reagent is of
E 200 Practice for Preparation, Standardization, and Stor-
sufficiently high purity to permit its use without lessening the
age of Standard and Reagent Solutions for Chemical
3 accuracy of the determination.
Analysis
7.2 Purity of Water—Unless otherwise indicated, references
3. Summary of Test Method to water shall be understood to mean reagent water as defined
by Type IV of Specification D 1193.
3.1 The specimen is mixed with either an equal volume of
7.3 Ethyl Alcohol (Ethanol), 95 volume %, minimum.
chilled water or an equal volume of ethyl alcohol and titrated
at reduced temperature with aqueous sodium hydroxide solu-
NOTE 1—Denatured ethyl alcohol conforming to Formula No. 3A of the
tion to a phenolphthalein end point.
U.S. Treasury Department, Bureau of Industrial Alcohol, is suitable for
use as a solvent.
4. Significance and Use
7.4 Phenolphthalein Indicator Solution (10 g/L)—Dissolve
4.1 This test method provides a measurement of total acidity
1 g of phenolphthalein in 100 mL of methanol, ethanol, or
in vinyl acetate and acetaldehyde. The results of these mea-
isopropanol.
surements can be used for specification acceptance.
7.5 Sodium Hydroxide, Standard Solution (0.05 N)—
Prepare and standardize a 0.05 N sodium hydroxide (NaOH)
5. Interferences
solution (Note 2) in accordance with the Sodium Hydroxide
5.1 Any material or contaminant that will react with NaOH
Solution sections of Practice E 200.
under the test conditions will affect the results.
NOTE 2—Alternatively, potassium hydroxide (KOH) solution may be
5.2 Vinyl acetate will decompose on storage, typically by
used.
way of hydrolysis, to form acetic acid.
7.6 Bromothymol Blue Indicator (10g/L)—Dissolve1gof
5.3 Acetaldehyde will react with oxygen, either dissolved or
bromothymol blue in 100 mL of methanol, ethanol, or isopro-
in a storage container, to form acetic acid.
panol.
5.4 Various acids or other acidic materials may be present.
7.7 Sodium Hydroxide, Standard Solution (0.02 N)—
Common practice, including the method used here, calculates
1
This test method is under the jurisdiction of ASTM Committee D-1 on Paint
4
Reagent Chemicals, American Chemical Society Specifications, American
and Related Coatings, Materials, and Applications and is the direct responsibility of
Chemical Society, Washington, DC. For suggestions on the testing of reagents not
Subcommittee D 01.35 on Solvents, Plasticizers, and Chemical Intermediates.
Current edition approved June 10, 1989. Published August 1999. Originally listed by the American Chemical Society, see Analar Standards for Laboratory
{1
published as D 2086 – 62 T. Last previous edition D 2086 – 89 (1993) . Chemicals, BDH Ltd., Poole, Dorset, U.K., and the United States Pharmacopeia
2
Annual Book of ASTM Standards, Vol 11.01. and National Formulary, U.S. Pharmacopeial Convention, Inc. (USPC), Rockville,
3
Annual Book of ASTM Standards, Vol 15.05. MD.
1

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D 2086
Prepare and standardize a 0.02 N sodium hydroxide (NaOH) 5 ~VN 3 0.056 3 1000!/50 D 5 ~VN 3 1.12!/D (2)
solution (Note
...