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• W1973836064 abstract "Pulse radiolysis experiments published several years ago (J. Phys. Chem. A, 2002, 106, 2430) raised the possibility that the carbonate radical formed from reaction of ·OH radicals with either HCO3− or CO32− might actually exist predominantly as a dimer form, for example, ·(CO3)23−. In this work we re-examine the data upon which this suggestion was based and find that the original data analysis is flawed. A major omission of the original analysis is the recombination reaction ·OH + ·CO3− → HOOCO2−. Upon reanalysis of the published data for sodium bicarbonate solutions and analysis of new transient absorption data we are able to establish the rate constant for this reaction up to 250 °C. The mechanism for the second-order self-recombination of the carbonate radical has never been convincingly demonstrated. From a combination of literature data and new transient absorption experiments in the 1−400 ms regime, we are able to show that the mechanism involves pre-equilibrium formation of a C2O62− dimer, which dissociates to CO2 and peroxymonocarbonate anion: ·CO3−+·CO3−↔C2O62−→CO2+O2COO2− ·CO3− reacts with the product peroxymonocarbonate anion, producing a peroxymonocarbonate radical ·O2COO−, which can also recombine with the carbonate radical: ·CO3−+CO42−→·CO4−+CO32− ·CO3−+·CO4−→C2O72−" @default.
• W1973836064 created "2016-06-24" @default.
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• W1973836064 date "2010-01-15" @default.
• W1973836064 modified "2023-09-23" @default.
• W1973836064 title "Carbonate Radical Formation in Radiolysis of Sodium Carbonate and Bicarbonate Solutions up to 250 °C and the Mechanism of its Second Order Decay" @default.
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• W1973836064 doi "https://doi.org/10.1021/jp9105162" @default.
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• W1973836064 hasPublicationYear "2010" @default.
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