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Title: Kinetics of the Temperature-Dependent eaq- and ·OH Radical Reactions with Cr(III) Ions in Aqueous Solutions

Journal Article · · ChemPhysChem

Abstract The reactivity of chromium(III) species with the major oxidizing and reducing radiolysis products of water was investigated in aqueous solutions at temperatures up to 150 °C. The reaction between the hydrated electron (e aq ) and Cr(III) species showed a positive temperature dependence over this temperature range. The reaction was also studied in pH 2.5 and 3.5 solutions for the first time. This work also studied the reaction between acidic Cr(III) species and the hydroxyl radical (⋅OH). It was found that Cr 3+ did not react significantly with the ⋅OH radical, but the first hydrolysis species, Cr(OH) 2+ , did with a rate coefficient of k = (7.2±0.3)×10 8  M −1  s −1 at 25 °C. The oxidation of Cr(OH) 2+ by the ⋅OH radical formed an absorbing product species that ultimately oxidized to give Cr(VI). These newly measured reaction rates allow for the development of improved models of aqueous chromium speciation for the effective remediation of liquid high‐level nuclear waste via vitrification processes.

Research Organization:
Idaho National Laboratory (INL), Idaho Falls, ID (United States); University of Notre Dame, IN (United States). Notre Dame Radiation Laboratory (NDRL)
Sponsoring Organization:
USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB)
Grant/Contract Number:
AC07-05ID14517; FC02-04ER15533
OSTI ID:
2228293
Alternate ID(s):
OSTI ID: 2234331
Report Number(s):
INL/JOU-23-72230-Rev001; TRN: US2407351
Journal Information:
ChemPhysChem, Vol. 24, Issue 24; ISSN 1439-4235
Publisher:
ChemPubSoc EuropeCopyright Statement
Country of Publication:
United States
Language:
English

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