ASTM D2193-97

NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
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Designation: D 2193 – 97
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
Hydroquinone in Vinyl Acetate
This standard is issued under the fixed designation D 2193; 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 all reagents shall conform to the specifications of the Commit-
tee on Analytical Reagents of the American Chemical Society,
1.1 This test method covers the determination of hydro-
where such specifications are available. Other grades may be
quinone in the range from 1 to 20 ppm in refined, commercially
used provided it is first ascertained that the reagent is of
available, vinyl acetate.
sufficiently high purity to permit its use without lessening the
1.2 This standard does not purport to address all of the
accuracy of the determination.
safety concerns, if any, associated with its use. It is the
6.2 Purity of Water—Unless otherwise indicated, references
responsibility of the user of this standard to establish appro-
to water shall be understood to mean reagent water conforming
priate safety and health practices and determine the applica-
to Type IV of Specification D 1193.
bility of regulatory limitations prior to use.
6.3 Ceric Acid Sulfate, Standard Solution (0.002 N)—
1.3 For hazard information and guidance, see the supplier’s
Dissolve 1.096 g of ceric ammonium nitrate ((NH ) -
4 2
Material Safety Data Sheet.
Ce(NO ) ) in 28.0 mL of concentrated sulfuric acid (H SO ,sp
3 6 2 4
2. Referenced Documents
gr 1.84) contained in a 50-mL beaker. Slowly pour the ceric
solution, while stirring, into 200 mL of water contained in a
2.1 ASTM Standards:
600-mL beaker. When solution is complete, transfer this
D 1193 Specification for Reagent Water
mixture to a 1000-mL volumetric flask and dilute to the mark
3. Summary of Test Method
with water.
6.4 Diphenylamine Indicator Solution—Dissolve 0.1 g of
3.1 The vinyl acetate is evaporated at room temperature in a
diphenylamine in 100 mL of H SO (sp gr 1.84) and store this
stream of inert gas or clean air to minimize the loss of 2 4
solution in a brown glass bottle.
hydroquinone by evaporation. The hydroquinone is dissolved
6.5 Hydroquinone Standard—Dissolve 200.0 mg of hydro-
in water and titrated with dilute standardized ceric acid sulfate
quinone, weighed to the nearest 0.1 mg, in water and dilute to
using diphenylamine as indicator.
1000.0 mL in a volumetric flask. This solution is unstable and
4. Significance and Use
should be discarded after 1 week of normal use.
4.1 This test method provides a measurement of inhibitor
7. Standardization
level in vinyl acetate. The results of these measurements can be
7.1 Pipet 10-mL portions of the hydroquinone standard (see
used for specification acceptance.
6.5) into each of two 100-mL Erlenmeyer flasks. Add 3 drops
5. Apparatus
of diphenylamine indicator solution to each flask. Using a
25-mL buret, titrate the contents of each flask with ceric acid
5.1 Buret, 25-mL, graduated in 0.1-mL subdivisions.
sulfate solution to a faint blue end point that is permanent for
5.2 Beakers, 50 and 600-mL capacity.
15 s. The titrations should be approximately 20 mL and should
5.3 Volumetric Flask, 1000-mL capacity.
agree within 0.5 mL. Average the two values and use in the
5.4 Erlenmeyer Flasks, 100 and 250-mL capacity.
calculations (Section 9).
5.5 Nitrogen Cylinder, or source of clean air.
5.6 Pipets, 10 and 50-mL capacity.
8. Procedure
6. Reagents
8.1 Pipet 50 mL of the vinyl acetate sample into each of two
250-mL flasks.
6.1 Purity of Reagents—Reagent grade chemicals shall be
8.2 Evaporate the specimens at room temperature by pass-
used in all tests. Unless other
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