Affordable Access

Publisher Website

Free Ḃr atom and free radical reactions in the radiolysis of 1,2-dibromoethane (DBE) and other bromohydrocarbons in air-free aqueous solutions

Authors
Journal
International Journal of Radiation Applications and Instrumentation Part C Radiation Physics and Chemistry
1359-0197
Publisher
Elsevier
Publication Date
Volume
32
Issue
6
Identifiers
DOI: 10.1016/1359-0197(88)90161-0

Abstract

Abstract G(Br -)-values have been evaluated in Ar- and N 2O-saturated 1,2-dibromoethane (DBE), bromobutane, propylbromide and bromopentane (BP) under a variety of experimental conditions in aqueous solutions. G(Br -) increases with increasing halogenated hydrocarbon concentration and with increasing pH. Free Ḃr atoms formed as a result of e - aq and ȮH radical reactions with bromohydrocarbons are considered to initiate a chain reaction. Another chain reaction has been invoked to explain the high G(Br -) at high pH. Ḃr radicals may form a reactive intermediate with OH - (BrOH ⨪), which decays to Br - and ȮH. The ȮH radicals have been found to interact with bromohydrocarbons and eventually yields Br - ions. The formation of Br - ions is accelerated both at acidic and alkaline pH in systems containing t-butanol. Dose rate studies in Ar- and N 2O-saturated 1,2-DBE and BP show an increase in G(Br -)-values at low dose rate and confirm the occurrence of a chain reaction initiated by Ḃr atoms. From these studies the rate constant for the reaction of Ḃr with 1,2-DBE has been calculated to be ∼ 1 × 10 6M -1s -1.

There are no comments yet on this publication. Be the first to share your thoughts.