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Issue 108, 2015
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Revisited water radiolysis at elevated pH by accounting O3˙ kinetics at low and high LET

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Abstract

Ozonide radical, O3˙, is used in this study for probing radiolytic species formed in the radiolysis of liquid water at elevated pH. Its formation allows the scavenging of O˙ whereas its disappearing is due to its reactions with HO2 and O2˙. This article focuses on the formation and the reaction of O3˙ at pH 13.2 by using pulse radiolysis technique, with 10 MeV electrons and 1 GeV C6+ ions beams for the first time. This allowed us to work with two different Linear Energy Transfer (LET) values (0.27 and 33 eV nm−1 respectively), which means with two different primary distributions of radiolytic species. Consequently the rates constant of reactions O3˙ + HO2 and O3˙ + O2˙ could be revised with acceptable accuracy thanks to deterministic simulations: (1.1 ± 0.2) × 106 M−1 s−1 and (1.5 ± 0.5) × 107 M−1 s−1 respectively. Furthermore, the primary radiolytic yields of HO˙/O˙ and H2O2/HO2 at high LET and pH 13.2 were estimated at 6.5 and 9.6 × 10−8 mol J−1 respectively which corresponds to the literature values.

Graphical abstract: Revisited water radiolysis at elevated pH by accounting O3˙− kinetics at low and high LET

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Publication details

The article was received on 20 Aug 2015, accepted on 08 Oct 2015 and first published on 08 Oct 2015


Article type: Paper
DOI: 10.1039/C5RA16858A
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Citation: RSC Adv., 2015,5, 89244-89253
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    Revisited water radiolysis at elevated pH by accounting O3˙ kinetics at low and high LET

    A. K. El Omar, G. Baldacchino, I. Monnet and P. Bouniol, RSC Adv., 2015, 5, 89244
    DOI: 10.1039/C5RA16858A

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