ASTM D2119-96

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Designation: D 2119 – 96
Standard Test Method for
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Aldehydes in Styrene Monomer
This standard is issued under the fixed designation D 2119; 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 present in the sample, is titrated with standard sodium hydrox-
ide solution. Ketones, if present, interfere by partially reacting
1.1 This test method covers the determination of aldehydes
with the reagent.
in styrene monomer. Aldehydes are calculated and reported as
benzaldehyde.
4. Significance and Use
1.2 The following applies to all specified limits in this test
4.1 This test method is suitable for determining the quantity
method: for purposes of determining conformance with this
of aldehydes, both for quality control and quality assurance of
test method, an observed value or a calculated value shall be
the product.
rounded off “to the nearest unit” in the last right-hand digit
used in expressing the specification limit, in accordance with
5. Apparatus
the rounding-off method of Practice E 29.
5.1 Erlenmeyer Flasks, glass-stoppered, 250-mL.
1.3 This standard does not purport to address all of the
5.2 Pipets, 25-mL.
safety concerns, if any, associated with its use. It is the
5.3 Volumetric Flasks, 100-mL.
responsibility of the user of this standard to establish appro-
5.4 Burets, 10-mL. (Microburets are preferred.)
priate safety and health practices and determine the applica-
5.5 Thermometers, capable of differentiating 1°C at ambi-
bility of regulatory limitations prior to use. For specific hazard
ent.
statements, see Section 7.
6. Reagents
2. Referenced Documents
6.1 Purity of Reagents—Reagent grade chemicals shall be
2.1 ASTM Standards:
2 used in all tests. Unless otherwise indicated, it is intended that
D 1193 Specification for Reagent Water
all reagents conform to the specifications of the Committee on
D 3437 Practice for Sampling and Handling Liquid Cyclic
3 Analytical Reagents of the American Chemical Society where
Products
6
such specifications are available. Other grades may be used,
E 29 Practice for Using Significant Digits in Test Data to
4 provided it is first ascertained that the reagent is of sufficiently
Determine Conformance with Specifications
high purity to permit its use without lessening the accuracy of
2.2 Other Documents:
the determination.
OSHA Regulations, 29 CFR, paragraphs 1910.1000 and
5 6.2 Purity of Water—Unless otherwise indicated, references
1910.1200
to water shall be understood to mean reagent water as defined
by Type III of Specification D 1193.
3. Summary of Test Method
6.3 Hydrochloric Acid, Standard (0.05 N)—Prepare a 0.05
3.1 An alcoholic solution of hydroxylamine hydrochloride
N solution of hydrochloric acid (HCl) by diluting 4.15 mL of
is added to a specimen of styrene monomer. Active aldehydes
concentrated HCl (density 1.19 g/mL) to 1 L with water.
present react in accordance with the following equation:
6.4 Hydroxylamine Hydrochloride Solution—Dissolve 20 g
RCHO 1 NH OH·HCl → RCHNOH 1 H O 1 HCl
2 2
of hydroxylamine hydrochloride (NH OH·HCl) in 1 L of
2
The hydrochloric acid, which is equivalent to the aldehyde
methanol and neutralize to the red-yellow end point of thymol
blue indicator.
1 6.5 Methanol.
This test method is under the jurisdiction of ASTM Committee D16 on
Aromatic Hydrocarbons and Related Chemicals and is the direct responsibility of 6.6 Sodium Hydroxide, Standard Solution (0.05 N)—
Subcommittee D16.07 on Styrene, Ethylbenzene, and C and C Aromatic
9 10 Dissolve 2.00 g of low-carbonate sodium hydroxide (NaOH) in
Hydrocarbons.
Current edition approved June 10, 1996. Published August 1996. Originally
e1 6
published as D 2119 – 62 T. Last previous edition D 2119 – 87 (1992) . Reagent Chemicals, American Chemical Society Specifications, American
2
Annual Book of ASTM Standards, Vol 11.01. Chemical Society, Washington, DC. For suggestions on the testing of reagents not
3
Annual Book of ASTM Standards, Vol 06.04. listed by the American Chemical Society, see Analar Standards for Laboratory
4
Annual Book of ASTM Standards, Vol 14.02. Chemicals, BDH Ltd., Poole, Dorset, U.K., and the United States Pharmacopeia
5
Available from Superintendent of Documents, U.S. Government Printing and National Formulary, U.S. Pharmaceutical Convention, Inc. (USPC), Rockville,
Office, Washington, DC 20402. MD.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
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