High-Temperature Reaction Kinetics of the eaq– and HO2• Radicals with Iron(II) Ions in Aqueous Solutions

Conrad, Jacy K.; Lisouskaya, Aliaksandra; Barr, Logan; Stuart, Craig R.; Bartels, David M.

doi:10.1021/acs.jpca.3c02436

High-Temperature Reaction Kinetics of the e_aq^– and HO₂^• Radicals with Iron(II) Ions in Aqueous Solutions

Journal Article · Tue Jun 27 00:00:00 EDT 2023 · Journal of Physical Chemistry. A, Molecules, Spectroscopy, Kinetics, Environment, and General Theory

DOI:https://doi.org/10.1021/acs.jpca.3c02436· OSTI ID:1991955

^[1]; ^[2]; ^[3]; Stuart, Craig R. ^[3]; ^[2]

Idaho National Laboratory (INL), Idaho Falls, ID (United States). Center for Radiation Chemistry Research
University of Notre Dame, IN (United States)
Canadian Nuclear Laboratories, Chalk River, ON (Canada)

Pulsed electron radiolysis was used to determine the chemical reaction kinetics and Arrhenius parameters for iron(II) reactions in aqueous solutions under irradiation. The second-order Fe²⁺ reactions with the hydrated electron (e_aq^–) and the perhydroxyl radical (HO₂^•), arising from water radiolysis, were measured to high temperatures using custom-built flow-through cells with a multichannel optical detection system. The reaction with the HO₂^• radical was found to proceed via the formation of a metal-ion adduct species, Fe²⁺–HO₂^•. Additionally, the adduct’s molar extinction coefficient and its first-order decay rate coefficients are reported.

View Accepted Manuscript (DOE)

Research Organization:: Idaho National Laboratory (INL), Idaho Falls, ID (United States)

Sponsoring Organization:: USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC07-05ID14517; FC02-04ER15533

OSTI ID:: 1991955

Report Number(s):: INL/JOU-23-71913-Rev000

Journal Information:: Journal of Physical Chemistry. A, Molecules, Spectroscopy, Kinetics, Environment, and General Theory, Journal Name: Journal of Physical Chemistry. A, Molecules, Spectroscopy, Kinetics, Environment, and General Theory Journal Issue: 27 Vol. 127; ISSN 1089-5639

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
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High-Temperature Reaction Kinetics of the eaq– and HO2• Radicals with Iron(II) Ions in Aqueous Solutions

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High-Temperature Reaction Kinetics of the e_aq^– and HO₂^• Radicals with Iron(II) Ions in Aqueous Solutions