TURN OUR EXPERIENCE TO YOUR EXPERTISE …Team of specialists close to you in track with your needs Chromatography Corner Overview • Diluted solutions of peroxides are used as catalysts or reaction initiators. • Peroxides can be formed through autoxidation in certain classes of • compounds including ethers, acetals, dienes, and alkyl aromatic hydrocarbons . • Peroxides present a potential safety hazard during production and storage. ASTM D5799:” Butadiene polyperoxide is a very dangerous product of the reaction between butadiene and oxygen that can occur. The peroxide has been reported to be the cause of some violent explosions in vessels that are used to store butadiene.” • Hydroperoxides in fuels have a deleterious effect on elastomers in fuel systems • Peroxides reduced the octane rating in gasoline . Current Test Methods ASTM D2340 • 50 mL sample needed, 200 mL IPA and 10 mL Acetic Acid • Reflux for 10 minutes at ~120 ºC • Cooldown step followed by I2 Titration ASTM E299 • 1 hour reaction at Room temperature • Spectrometer detection of I2 Most methods suffer from Oxygen (air) interference: • 4HI + O2 → 2H2O + 2 I2 Principle of Fast Peroxide Analyzer • Accurate monitoring is needed to determine trace amounts of reactive peroxides • Peroxide oxidizes acidified Iodide: ROOH + 2I- + 2H+ ROH + I2 + H2O • The Iodine (I2) is proportional to the concentration of Peroxide • Iodine is determined spectrophotometrically at 350 nm by UV

Chromatography Corner...ASTM D2340 • 50 mL sample needed, 200 mL IPA and 10 mL Acetic Acid • Reflux for 10 minutes at ~120 ºC • Cooldown step followed by I2 Titration ASTM E299

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Page 1: Chromatography Corner...ASTM D2340 • 50 mL sample needed, 200 mL IPA and 10 mL Acetic Acid • Reflux for 10 minutes at ~120 ºC • Cooldown step followed by I2 Titration ASTM E299

TURN OUR EXPERIENCE TO YOUR EXPERTISE

…Team of specialists close to you in track with your needs

Chromatography Corner

Overview • Diluted solutions of peroxides are used as catalysts or reaction initiators. • Peroxides can be formed through autoxidation in certain classes of • compounds including ethers, acetals, dienes, and alkyl aromatic hydrocarbons . • Peroxides present a potential safety hazard during production and storage.

ASTM D5799:” Butadiene polyperoxide is a very dangerous product of the reaction between butadiene and oxygen that can occur. The peroxide has been reported to be the cause of some violent explosions in vessels that are used to store butadiene.” • Hydroperoxides in fuels have a deleterious effect on elastomers in fuel systems • Peroxides reduced the octane rating in gasoline .

Current Test Methods ASTM D2340

• 50 mL sample needed, 200 mL IPA and 10 mL Acetic Acid • Reflux for 10 minutes at ~120 ºC • Cooldown step followed by I2 Titration

ASTM E299 • 1 hour reaction at Room temperature • Spectrometer detection of I2

Most methods suffer from Oxygen (air) interference: • 4HI + O2 → 2H2O + 2 I2

Principle of Fast Peroxide Analyzer • Accurate monitoring is needed to determine trace amounts of reactive peroxides

• Peroxide oxidizes acidified Iodide: ROOH + 2I- + 2H+ ROH + I2 + H2O

• The Iodine (I2) is proportional to the concentration of Peroxide

• Iodine is determined spectrophotometrically at 350 nm by UV