ASTM D2340-03

Standard Test Method for Peroxides in Styrene Monomer

SIGNIFICANCE AND USE
This test method is suitable for determining the quantity of peroxides in styrene monomer both for quality control and quality assurance of the product.
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-Jan-2003
• 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

• Replaces: ASTM D2340-96 - Standard Test Method for Peroxides in Styrene Monomer
• Effective Date: 10-Jan-2003
• Replaced By: ASTM D2340-09 - Standard Test Method for Peroxides in Styrene Monomer
• Effective Date: 15-Jun-2009
• Referred By: ASTM D2827-19 - Standard Specification for Styrene Monomer
• Effective Date: 10-Jan-2003

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:D2340–03
Standard Test Method for
1
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 * tively. The liberated iodine is then titrated with sodium
thiosulfate to a colorless end point.
1.1 This test method covers the determination of the perox-
ide content of styrene monomer.
4. Significance and Use
1.2 In determining the conformance of the test results using
4.1 This test method is suitable for determining the quantity
this method to applicable specifications, results shall be
of peroxides in styrene monomer both for quality control and
rounded off in accordance with the rounding-off method of
quality assurance of the product.
Practice E 29.
1.3 This standard does not purport to address all of the
5. Apparatus
safety concerns, if any, associated with its use. It is the
5.1 Erlenmeyer Flasks, glass-stoppered, 500-mL, equipped
responsibility of the user of this standard to establish appro-
with 300-mm Liebig condensers having inner and outer stan-
priate safety and health practices and determine the applica-
dard taper joints.
bility of regulatory limitations prior to use. For specific hazard
5.2 Electric Hot Plate with totally enclosed heating unit.
statements, see Section 7.
5.3 Boiling Chips.
2. Referenced Documents
6. Reagents
2.1 ASTM Standards:
2 6.1 Purity of Reagents—Reagent grade chemicals shall be
D 1193 Specification for Reagent Water
used in all tests. Unless otherwise indicated, it is intended that
D 3437 Practice for Sampling and Handling Liquid Cyclic
3 all reagents shall conform to the specifications of the Commit-
Products
tee on Analytical Reagents of the American Chemical Society
E 29 Practice for Using Significant Digits in Test Data to
6
4 where such specifications are available. Other grades may be
Determine Conformance with Specifications
used, provided it is first ascertained that the reagent is of
2.2 Other Documents:
sufficiently high purity to permit its use without lessening the
OSHA Regulations, 29 CFR, paragraphs 1910.1000 and
accuracy of the determination.
5
1910.1200
6.2 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 III of Specification D 1193.
3.1 A specimen of styrene monomer is added to a solution
6.3 Glacial Acetic Acid.
of isopropanol and acetic acid. A saturated solution of sodium
6.4 Isopropyl Alcohol.
iodide in isopropanol is added and the solution refluxed. The
6.5 Sodium Iodide Isopropyl Alcohol Solution—Prepare a
peroxides present liberate iodine from sodium iodide quantita-
saturated solution of sodium iodide in isopropanol (approxi-
mately 200 g NaI/L).
1
This test method is under the jurisdiction of ASTM Committee D16 on
6.6 Sodium Thiosulfate, Standard Solution (0.01 N)—
Aromatic Hydrocarbons and Related Chemicals and is the direct responsibility of
Dissolve 2.5 g of sodium thiosulfate (Na S O ·5H O) and 0.1
2 2 3 2
Subcommittee D16.07 on Styrene, Ethylbenzene, and C and C Aromatic
9 10
Hydrocarbons.
Current edition approved Jan. 10, 2003. Published March 2003. Originally
6
approved in 1965. Last previous edition approved in 1996 as D 2340 – 96. 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
AvailablefromU.S.GovernmentPrintingOfficeSuperintendentofDocuments, and National Formulary, U.S. Pharmacopeial Convention, Inc. (USPC), Rockville,
732 N. Capitol St., NW, Mail Stop: SDE, Washington, DC 20401. 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.
1

---------------------- Page: 1 ----------------------
D2340–03
4
g of sodium carbonate (Na CO ) in water and dilute to 1 L.
Peroxides, mg/kg 5 @~A 2 B! 3 N 3 1.7 3 10 # / ~50 3 C!
2 3
Standardize against primary standard potassium dichromate
where:
(K Cr O ).
2 2 7
A = total millilitres of Na S O solution required for
2 2 3
7. Hazards
titration of the specimen,
B = total millilitres of Na S O solution required for
2 2 3
7.1 ConsultthelatestOSHAregulations,supplier’sMaterial
titration of the
...