ASTM D2340-23 PDF
Name in English:
St ASTM D2340-23
Name in Russian:
Ст ASTM D2340-23
Original standard ASTM D2340-23 in PDF full version. Additional info + preview on request
Full title and description
ASTM D2340-23 — Standard Test Method for Peroxides in Styrene Monomer. This procedure specifies an analytical test for determining the peroxide content of styrene monomer, reported as equivalent hydrogen peroxide, for quality control and quality assurance of the product.
Abstract
ASTM D2340-23 describes an iodometric titration procedure in which peroxides present in a styrene monomer sample liberate iodine from iodide after reflux in an alcohol solvent; the liberated iodine is titrated with standardized sodium thiosulfate to determine peroxide concentration. The method is intended for routine analysis and covers a practical measurement range with defined limits of detection and quantitation.
General information
- Status: Active standard
- Publication date: January 1, 2023
- Publisher: ASTM International
- ICS / categories: 71.080.15 (Aromatic hydrocarbons)
- Edition / version: D2340-23 (current edition)
- Number of pages: 3
Scope
This test method covers the determination of peroxide content in styrene monomer and reports results as hydrogen peroxide equivalent. It applies to typical peroxide concentrations encountered in commercial styrene (method found applicable in a practical range up to about 60 mg/kg). The standard specifies units in SI, requires rounding in accordance with Practice E29 when reporting conformance, and notes that users must observe appropriate safety, health, and environmental practices when handling reactive chemicals and peroxidized materials.
Key topics and requirements
- Purpose: quantitative determination of peroxides in styrene monomer for QC and QA.
- Analytical principle: peroxide-mediated liberation of iodine from iodide followed by titration with sodium thiosulfate (iodometric titration).
- Apparatus: reflux assembly (glass-stoppered Erlenmeyer + Liebig condenser), heating plate, titration glassware, burettes.
- Reagents: reagent-grade solvents (isopropanol or specified alcohol), sodium iodide, standardized sodium thiosulfate, starch indicator, and other analytical reagents.
- Performance metrics: applicable measurement range to about 1–60 mg/kg (typical method range); reported limits of detection and quantitation appropriate to the method (users should consult the standard for LOD/LOQ values and precision data).
- Reporting: results reported as hydrogen peroxide equivalent and rounded per Practice E29.
- Safety and handling: includes warnings about working with peroxidized monomers and flammable solvents; users must establish appropriate laboratory safety measures.
Typical use and users
Used by quality control and analytical laboratories at styrene producers, polymer and resin manufacturers (polystyrene, ABS, SBR, EPS producers), independent testing laboratories, raw-material purchasers, and R&D groups monitoring inhibitor/peroxide levels. The method supports product release testing, storage-stability checks, and investigations of polymerization risk due to peroxides.
Related standards
Commonly used alongside other ASTM methods and practices for styrene and hydrocarbons, for example Practice E29 (rounding and reporting), and various compositional and impurity tests referenced in styrene specifications (other ASTM methods for inhibitors, polymer content, color, water, etc.). The standard has earlier editions (e.g., D2340-18, D2340-13, historical D2340-03) and was developed under the ASTM D16 committee (subcommittee D16.07).
Keywords
peroxides; styrene monomer; iodometric titration; hydrogen peroxide equivalent; peroxide content; quality control; LOD; LOQ; ASTM D2340-23.
FAQ
Q: What is this standard?
A: ASTM D2340-23 is the ASTM International standard test method for determining peroxide content in styrene monomer, using an iodometric titration technique and reporting results as equivalent hydrogen peroxide.
Q: What does it cover?
A: It covers the analytical procedure, required apparatus and reagents, performance characteristics (practical measurement range and precision guidance), reporting conventions (including rounding per Practice E29), and safety considerations for peroxide analysis in styrene monomer.
Q: Who typically uses it?
A: Quality control and analytical chemists in styrene and polymer manufacturing, independent test laboratories, procurement/specification teams, and researchers monitoring peroxide/inhibitor status or assessing polymerization risk.
Q: Is it current or superseded?
A: The D2340-23 edition (published January 1, 2023) is the current active edition. Earlier editions include D2340-18, D2340-13 and older historical versions.
Q: Is it part of a series?
A: D2340 is a standalone test method within ASTM’s chemical and petroleum product standards (Book of Standards volume for aromatic hydrocarbons and related analytical methods). It is developed under ASTM Committee D16 with subcommittee involvement and is often used in combination with other ASTM test methods referenced for styrene quality and impurity analyses.
Q: What are the key keywords?
A: Peroxides, styrene monomer, iodometric titration, hydrogen peroxide equivalent, peroxide content, quality control, LOD, LOQ, ASTM D2340-23.