ASTM D2191-06

Designation: D2191 − 06
Standard Test Method for
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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* with a standard iodine solution, is a measure of the acetalde-
hyde present in the vinyl acetate.
1.1 This test method covers the determination of trace
quantities of acetaldehyde, in the range from 0.00 to 0.05 %,
4. Significance and Use
contained in 99 % grade vinyl acetate.
4.1 This test method provides a measurement of acetalde-
1.2 For purposes of determining conformance of an ob-
hyde content in vinyl acetate. The results of these measure-
served or a calculated value using this test method to relevant
ments can be used for specification acceptance.
specifications, test result(s) shall be rounded off “to the nearest
unit” in the last right-hand digit used in expressing the
5. Interference
specification limit, in accordance with the rounding-off method
5.1 Ketonesandotheraldehydes,ifpresent,causeapositive
of Practice E29.
interference.
1.3 The values stated in SI units are to be regarded as
6. Apparatus
standard. No other units of measurement are included in this
standard.
6.1 Buret, 50-mL capacity, graduated in 0.1-mL subdivi-
sions, with a funnel or flared top and a ground-glass stopcock.
1.4 For hazard information and guidance, see the supplier’s
Material Safety Data Sheet.
6.2 Erlenmeyer Flask, 500-mL capacity, glass-stoppered.
1.5 This standard does not purport to address all of the
6.3 Pipet, 50-mL capacity.
safety concerns, if any, associated with its use. It is the
6.4 Pipet, 100-mL capacity.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
7. Reagents
bility of regulatory limitations prior to use. For specific hazard
7.1 Purity of Reagents—Unless otherwise indicated, it is
statements see Section 8.
intended that all reagents shall conform to the specifications of
theCommitteeonAnalyticalReagentsoftheAmericanChemi-
2. Referenced Documents
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cal Society, where such specifications are available. Other
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2.1 ASTM Standards:
grades may be used provided that it is first ascertained that the
D1193 Specification for Reagent Water
reagent is of sufficiently high purity to permit its use without
E29 Practice for Using Significant Digits in Test Data to
lessening the accuracy of the determination.
Determine Conformance with Specifications
7.2 Purity of Water—Unless otherwise indicated, references
to water shall be understood to mean reagent water as defined
3. Summary of Test Method
by Type IV of Specification D1193.
3.1 The acetaldehyde present in the specimen is reacted
7.3 Iodine, Standard Solution (0.1 N)—Dissolve 35.0 g of
with a measured excess of sodium bisulfite. The amount of
potassiumiodide(KI)and13.0gofresublimediodineinwater,
sodium bisulfite consumed, determined by titrating the excess
and dilute to 1 Lwith water. Store this solution in a dark bottle
and standardize each day, as required, against a standard 0.1 N
sodium thiosulfate (Na S O ) solution. (See standardization
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2 2 3
This test method is under the jurisdiction of ASTM Committee D01 on Paint
procedure, 9.3 and 9.4.)
and Related Coatings, Materials, andApplications and is the direct responsibility of
Subcommittee D01.35 on Solvents, Plasticizers, and Chemical Intermediates .
Current edition approved April 1, 2006. Published April 2006. Originally
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approved in 1963. Last previous edition approved in 2001 as D2191 – 97 (2001). Reagent Chemicals, American Chemical Society Specifications , American
DOI: 10.1520/D2191-06. Chemical Society, Washington, DC. For suggestions on the testing of reagents not
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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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D2191 − 06
7.4 Potassium Iodate (KIO ), primary standard.
V = volumeofNa S O requiredfortitrationoftheKIO ,
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2 2 3 3
mL.
7.5 Sodium Bisulfite Solution (0.44 %) —Dissolve 4.4 g of
sodium metabisulfite (Na S O ) in 1 L of water. This solution
9.3 Fillthefunnel-topped50-mLburetwiththe0.1 Niodine
2 2 5
should be prepared
...