ASTM D2340-96

Standard Test Method for Peroxides in Styrene Monomer

SCOPE
1.1 This test method covers the determination of the peroxide content of styrene monomer.
1.2 The following applies to all specified limits in this test method: for purposes of determining conformance with this test method, an observed value or a calculated value shall be rounded off "to the nearest unit" in the last right-hand digit used in expressing the specification limit, in accordance with the rounding-off method of Practice E29.  
1.3 This standard does not purport to address all of the safety concerns, 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 7.

General Information

• Status: Historical
• Publication Date: 09-Jun-1996
• ICS: 71.080.15 - Aromatic hydrocarbons
• Technical Committee: D16 - Aromatic, Industrial, Specialty and Related Chemicals
• Drafting Committee: D16.07 - Styrene, Ethylbenzene and C9 and C10 Aromatic Hydrocarbons

Relations

• Replaced By: ASTM D2340-03 - Standard Test Method for Peroxides in Styrene Monomer
• Effective Date: 10-Jan-2003
• Referred By: ASTM D2827-19 - Standard Specification for Styrene Monomer
• Effective Date: 10-Jun-1996

Standards Content (Sample)

NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: D 2340 – 96
Standard Test Method for
Peroxides in Styrene Monomer
This standard is issued under the fixed designation D 2340; 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 thiosulfate to a colorless end point.
1.1 This test method covers the determination of the perox-
4. Significance and Use
ide content of styrene monomer.
4.1 This test method is suitable for determining the quantity
1.2 The following applies to all specified limits in this test
of peroxides in styrene monomer both for quality control and
method: for purposes of determining conformance with this
quality assurance of the product.
test method, an observed value or a calculated value shall be
rounded off “to the nearest unit” in the last right-hand digit
5. Apparatus
used in expressing the specification limit, in accordance with
5.1 Erlenmeyer Flasks, glass-stoppered, 500-mL, equipped
the rounding-off method of Practice E 29.
with 300-mm Liebig condensers having inner and outer stan-
1.3 This standard does not purport to address all of the
dard taper joints.
safety concerns, if any, associated with its use. It is the
5.2 Electric Hot Plate with totally enclosed heating unit.
responsibility of the user of this standard to establish appro-
5.3 Boiling Chips.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. For specific hazard
6. Reagents
statements, see Section 7.
6.1 Purity of Reagents—Reagent grade chemicals shall be
used in all tests. Unless otherwise indicated, it is intended that
2. Referenced Documents
all reagents shall conform to the specifications of the Commit-
2.1 ASTM Standards:
2 tee on Analytical Reagents of the American Chemical Society
D 1193 Specification for Reagent Water
where such specifications are available. Other grades may be
D 3437 Practice for Sampling and Handling Liquid Cyclic
3 used, provided it is first ascertained that the reagent is of
Products
sufficiently high purity to permit its use without lessening the
E 29 Practice for Using Significant Digits in Test Data to
4 accuracy of the determination.
Determine Conformance with Specifications
6.2 Purity of Water—Unless otherwise indicated, references
2.2 Other Documents:
to water shall be understood to mean reagent water as defined
OSHA Regulations, 29 CFR, paragraphs 1910.1000 and
5 by Type III of Specification D 1193.
1910.1200
6.3 Glacial Acetic Acid.
3. Summary of Test Method 6.4 Isopropyl Alcohol.
6.5 Sodium Iodide Isopropyl Alcohol Solution—Prepare a
3.1 A specimen of styrene monomer is added to a solution
saturated solution of sodium iodide in isopropanol (approxi-
of isopropanol and acetic acid. A saturated solution of sodium
mately 200 g NaI/L).
iodide in isopropanol is added and the solution refluxed. The
6.6 Sodium Thiosulfate, Standard Solution (0.01 N)—
peroxides present liberate iodine from sodium iodide quantita-
Dissolve 2.5 g of sodium thiosulfate (Na S O ·5H O) and 0.1
2 2 3 2
tively. The liberated iodine is then titrated with sodium
g of sodium carbonate (Na CO ) in water and dilute to 1 L.
2 3
Standardize against primary standard potassium dichromate
(K Cr O ).
This test method is under the jurisdiction of ASTM Committee D16 on 2 2 7
Aromatic Hydrocarbons and Related Chemicals and is the direct responsibility of
Subcommittee D16.07 on Styrene, Ethylbenzene, and C and C Aromatic
9 10
Hydrocarbons.
Current edition approved June 10, 1996. Published August 1996. Originally
e1 6
published as D 2340 – 65 T. Last previous edition D 2340 – 82 (1992) . Reagent Chemicals, American Chemical Society Specifications, American
Annual Book of ASTM Standards, Vol 11.01. Chemical Society, Washington, DC. For suggestions on the testing of reagents not
Annual Book of ASTM Standards, Vol 06.04. listed by the American Chemical Society, see Analar Standards for Laboratory
Annual Book of ASTM Standards, Vol 14.02. Chemicals, BDH Ltd., Poole, Dorset, U.K., and the United States Pharmacopeia
Available from Superintendent of Documents, U.S. Government Printing an
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