Free Radical Chemistry of Disinfection Byproducts. 3. Degradation Mechanisms of Chloronitromethane, Bromonitromethane and Dichloronitromethane

Journal Article · Fri Jan 01 04:00:00 EST 2010 · Journal of Physical Chemistry A

DOI:https://doi.org/10.1021/jp907305g· OSTI ID:974420

Mincher, Bruce J; Mezyk, Stephen P; Cooper, William J; Cole, S Kirkham; Fox, Robert V; Gardinali, Piero R

Halonitromethanes (HNMs) are byproducts formed through ozonation and chlorine/ chloramine disinfection processes in drinking waters that contain dissolved organic matter and bromide ions. These species occur at low concentration, but have been determined to have high cytotoxicity and mutagenicity and therefore may represent a human health hazard. In this study, we have investigated the chemistry involved in the mineralization of HNMs to non-hazardous inorganic products through the application of advanced oxidation and reduction processes. We have combined measured absolute reaction rate constants for the reactions of chloronitromethane, bromonitromethane and dichloronitromethane with the hydroxyl radical and the hydrated electron with a kinetic computer model in an attempt to elucidate the reaction pathways of these HNMs. The results are compared to measurements of stable products resulting from steady-state 60Co y-irradiations of the same compounds. The model predicted the decomposition of the parent compounds and ingrowth of chloride and bromide ions with excellent accuracy, but the prediction of the total nitrate ion concentration was slightly in error, reflecting the complexity of nitrogen oxide species reactions in irradiated solution.

• Research Organization: Idaho National Laboratory (INL)
• Sponsoring Organization: DOE - SC
• DOE Contract Number: AC07-05ID14517
• OSTI ID: 974420
• Report Number(s): INL/JOU-09-16526
• Journal Information: Journal of Physical Chemistry A, Journal Name: Journal of Physical Chemistry A Journal Issue: 1 Vol. 114
• Country of Publication: United States
• Language: English

Related Subjects

99 GENERAL AND MISCELLANEOUS
BROMIDES
CHEMISTRY
CHLORAMINES
CHLORIDES
CHLORINE
COMPUTERS
DRINKING WATER
HEALTH HAZARDS
HYDRATION
HYDROXYL RADICALS
KINETICS
MINERALIZATION
NITRATES
NITROGEN OXIDES
ORGANIC MATTER
OXIDATION
RADICALS
REACTION KINETICS
SOLVATED ELECTRONS
STERILIZATION
disinfection byproducts