Ja. Laverne et Sm. Pimblott, DIFFUSION-KINETIC MODELING OF THE COOPERATIVE EFFECT OF SCAVENGERS ONTHE SCAVENGED YIELD OF THE HYDROXYL RADICAL, Journal of the Chemical Society. Faraday transactions, 89(19), 1993, pp. 3527-3532
Citations number
34
Categorie Soggetti
Chemistry Physical","Physics, Atomic, Molecular & Chemical
The scavenger concentration dependence of the scavenged yield of the h
ydroxyl radical produced by the high-energy electron radiolysis of dea
erated, and of nitrous oxide saturated, aqueous solutions is modelled
using deterministic diffusion-kinetic methods. These calculations prov
ide a simple, but valuable, method for estimating the scavenged yield
of the hydroxyl radical in a variety of systems containing both hydrox
yl radical and hydrated electron scavengers. The scavenging of hydroxy
l radicals in an aqueous solution usually can be divided into two comp
onents: the yield that would be scavenged by the hydroxyl radical scav
engers in the absence of any hydrated electron scavenger and an additi
onal contribution arising from the cooperative effect of the hydrated
electron scavenger. Hydrated electron scavengers reduce the amount of
intraspur e(aq)- + OH reaction and so increase the amount of hydroxyl
radical scavenged by a given concentration of hydroxyl radical scaveng
er. The yield of scavenged hydroxyl radicals in nitrous oxide solution
is not well represented by the sum of the yield of oxide radical anio
ns produced by the nitrous oxide scavenging of the hydrated electron a
nd the radiation-induced yield of hydroxyl radicals that would be scav
enged if the hydrated electron scavenging reaction did not produced hy
droxyl radicals. In nitrous oxide solutions a small modification to re
flect the increase in intraspur reactions of hydroxyl radicals is nece
ssary.