ASTM E299 Trace Peroxides in Organic Solvents

Scope

ASTM E299-08 applies to organic solvents that are known or suspected to form peroxides under normal storage and handling conditions. The method detects trace peroxide concentrations typically in the range of a few parts per million, expressed as hydrogen peroxide equivalents. It is a wet chemical, colorimetric procedure suitable for use in standard analytical laboratory environments.

Solvents commonly evaluated using this method include:

• Ethers – diethyl ether, tetrahydrofuran (THF), 1,4-dioxane, diisopropyl ether, and related compounds known for high peroxide-forming tendency
• Alcohols and glycols – isopropanol, 2-butanol, and certain polyols that can accumulate peroxides on prolonged storage
• Hydrocarbons and cyclic compounds – cyclohexane, decalin, and other aliphatic or alicyclic hydrocarbons susceptible to autoxidation
• Halogenated solvents – chloroform and methylene chloride, which can form peroxidic impurities under certain conditions
• Ketones and aldehydes – compounds that may generate peroxide species as secondary oxidation products

The method does not distinguish among individual peroxide species; it measures total peroxide content as a composite value relative to a hydrogen peroxide standard.

Applications

• Laboratory safety programs – routine screening of stored solvents to identify peroxide accumulation before distillation, concentration, or other operations that elevate explosion risk
• Solvent quality control – incoming inspection of received solvents to verify that peroxide levels are within acceptable limits before use or storage
• Chemical manufacturing and processing – monitoring of process solvents where peroxide buildup could compromise reaction selectivity, product quality, or personnel safety
• Academic and research institutions – periodic testing of long-stored solvents, particularly ethers, as part of chemical hygiene and laboratory safety protocols
• Solvent recycling and reclamation operations – assessment of recovered solvents before redistillation or reuse

Benefits

• Direct safety risk reduction: identifies peroxide-contaminated solvents before they are subjected to distillation, evaporation, or other concentration operations, where shock-sensitive residues can form.
• Simple, accessible procedure – the colorimetric method does not require specialized instrumentation and can be performed in any standard analytical laboratory
• Quantitative output – results are expressed as hydrogen peroxide equivalents in parts per million, providing a numerical basis for comparison against safety thresholds and acceptance criteria
• Low detection limits – the method is sensitive to trace-level peroxide concentrations, allowing action to be taken well before hazardous levels are reached
• Standardized and defensible – compliance with an ASTM-published method provides a documented, reproducible basis for quality records, safety audits, and regulatory review.
• Cost-effective screening – reagent and equipment costs are minimal relative to the safety and quality risk of undetected peroxide contamination