Radiation Chemistry of Methyl tert -Butyl Ether in Aqueous Solution

Journal Article · Thu Jul 01 04:00:00 EDT 2004 · Environmental Science and Technology

DOI:https://doi.org/10.1021/es034558t· OSTI ID:1363814

Mezyk, Stephen P.; Jones, Jace; Cooper, William J.; Tobien, Thomas; Nickelsen, Michael G.; Adams, J. Wesley; O'Shea, Kevin E.; Bartels, David M.; Wishart, James F.; Tornatore, Paul M.; Newman, Kimberley S.; Gregoire, Kellie

The chemical kinetics of the free-radical-induced degradation of the gasoline oxygenate methyl tert-butyl ether (MTBE) in water have been investigated. Rate constants for the reaction of MTBE with the hydroxyl radical, hydrated electron, and hydrogen atom were determined in aqueous solution at room temperature, using electron pulse radiolysis and absorption spectroscopy (•OH and e-aq) and EPR free induction decay attenuation (•H) measurements. The rate constant for hydroxyl radical reaction of (1.71 ± 0.02) × 109 M-1 s-1 showed that the oxidative process was the dominant pathway, relative to MTBE reaction with hydrogen atoms, (3.49 ± 0.06) × 106 M-1 s-1, or hydrated electrons, <8.0 × 106 M-1 s-1. The hydroxyl radical reaction gives a transient carbon-centered radical which subsequently reacts with dissolved oxygen to form peroxyl radicals, the rate constant for this reaction was (2.17 ± 0.06) × 109 M-1 s-1. The second-order decay of the MTBE peroxyl radical was 2k = (6.0 ± 0.3) × 108 M-1 s-1. These rate constants, along with preliminary MTBE degradation product distribution measurements, were incorporated into a kinetic model that compared the predicted MTBE removal from water against experimental measure ments performed under large-scale electron beam treatment conditions

• Research Organization: Argonne National Laboratory (ANL)
• Sponsoring Organization: USDOE Office of Science - Office of Basic Energy Sciences; National Science Foundation (NSF)
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 1363814
• Journal Information: Environmental Science and Technology, Journal Name: Environmental Science and Technology Journal Issue: 14 Vol. 38; ISSN 0013-936X
• Publisher: American Chemical Society (ACS)
• Country of Publication: United States
• Language: English