ASTM D2191-22

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: D2191 − 22
Standard Test Method for
Acetaldehyde Content of Vinyl Acetate
This standard is issued under the fixed designation D2191; 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 Determine Conformance with Specifications
1.1 This test method covers the determination of trace
3. Summary of Test Method
quantities of acetaldehyde, in the range from 0.00 to 0.05 %,
3.1 The acetaldehyde present in the specimen is reacted
contained in 99 % grade vinyl acetate.
with a measured excess of sodium bisulfite. The amount of
1.2 For purposes of determining conformance of an ob-
sodium bisulfite consumed, determined by titrating the excess
served or a calculated value using this test method to relevant
with a standard iodine solution, is a measure of the acetalde-
specifications, test result(s) shall be rounded off “to the nearest
hyde present in the vinyl acetate.
unit” in the last right-hand digit used in expressing the
4. Significance and Use
specification limit, in accordance with the rounding-off method
of Practice E29.
4.1 This test method provides a measurement of acetalde-
hyde content in vinyl acetate. The results of these measure-
1.3 The values stated in SI units are to be regarded as
ments can be used for specification acceptance.
standard. No other units of measurement are included in this
standard.
5. Interference
1.4 For hazard information and guidance, see the supplier’s
5.1 Ketonesandotheraldehydes,ifpresent,causeapositive
Material Safety Data Sheet.
interference.
1.5 This standard does not purport to address all of the
6. Apparatus
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
6.1 Buret, 50-mL capacity, graduated in 0.1-mL
priate safety, health, and environmental practices and deter-
subdivisions, with a funnel or flared top and a ground-glass
mine the applicability of regulatory limitations prior to use.
stopcock.
For specific hazard statements see Section 8.
6.2 Erlenmeyer Flask, 500-mL capacity, glass-stoppered.
1.6 This international standard was developed in accor-
6.3 Pipet, 50-mL capacity.
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
6.4 Pipet, 100-mL capacity.
Development of International Standards, Guides and Recom-
7. Reagents
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
7.1 Purity of Reagents—Unless otherwise indicated, it is
intended that all reagents shall conform to the specifications of
2. Referenced Documents
theCommitteeonAnalyticalReagentsoftheAmericanChemi-
2.1 ASTM Standards: cal Society, where such specifications are available. Other
D1193 Specification for Reagent Water
grades may be used provided that it is first ascertained that the
E29 Practice for Using Significant Digits in Test Data to 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
This test method is under the jurisdiction of ASTM Committee D01 on Paint
and Related Coatings, Materials, andApplications and is the direct responsibility of to water shall be understood to mean reagent water as defined
Subcommittee D01.35 on Solvents, Plasticizers, and Chemical Intermediates.
by Type IV of Specification D1193.
Current edition approved Jan. 1, 2022. Published January 2022. Originally
approved in 1963. Last previous edition approved in 2012 as D2191 – 06 (2012)
which was withdrawn January 2021 and reinstated in January 2022. DOI: 10.1520/ ACS Reagent Chemicals, Specifications and Procedures for Reagents and
D2191-22. Standard-Grade Reference Materials, American Chemical Society, Washington,
For referenced ASTM standards, visit the ASTM website, www.astm.org, or DC. For suggestions on the testing of reagents not listed by theAmerican Chemical
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Society, see Analar Standards for Laboratory Chemicals, BDH Ltd., Poole, Dorset,
Standards volume information, refer to the standard’s Document Summary page on U.K., and the United States Pharmacopeia and National Formulary, U.S. Pharma-
the ASTM website. copeial Convention, Inc. (USPC), Rockville, MD.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D2191 − 22
7.3 Iodine, Standard Solution (0.1 N)—Dissolve 35.0 g of 9.2 Calculate the normality N of the Na S O solution as
2 2 3
potassiumiodide(KI)and13.0gofresublimediodineinwater, follows:
and dilute to 1 Lwith water. Store this solution in a dark bottle
N 5 ~W 3 P!/~V 30.035669!
and standardize each day, as required, against a standard 0.1 N
where:
sodium thiosulfate (Na S O ) solution. (See standardization
2 2 3
procedure, 9.3 and 9.4.)
W = weight of KIO used, g
P = correction for purity of KIO standard, and
7.4 Potassium Iodate (KIO ), primary standard.
V = volume of Na S O required for titration of the KIO ,
2 2 3 3
7.5 Sodium Bisulfite Solution (0.44 %)—Dissolve 4.4 g of
mL.
sodium metabisulfite (Na S O ) in 1 L of water. This solution
2 2 5
9.3 Fillthefunnel-topped50-mLburetwiththe0.1 Niodine
should be prepared fresh daily or just before using.
solution to be standardized. Measure approximately 40 mL of
7.6 Sodium Thiosulfate, Standard Solution (0.1 N)—Weigh
the iodine solution into a 250-mL Erlenmeyer flask, and read
to 0.1 g 24.8 g of sodium thiosulfate (Na S O ·5H O) crystals
2 2 3 2
the buret to the nearest 0.1 mL. Add approximately 50 mL of
and dissolve in 500 mL of water. Dilute this solution to 1 L
water to the flask containing the iodine solution, and titrate
with water. Add 0.5 mL of chloroform per litre of solution as
with the standardized 0.1 N Na S O solution as described in
2 2 3
a preservative, and store in a clean
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