Abstract
From the effects of nitrous oxide on the radiation chemistry of aqueous solutions containing either (i) acrylamide, or (ii) potassium ferrocyanide and ferricyanide, the following conclusions are drawn. (1)
G
H
2
and
G
H
2
O
2
diminish only slightly as pH is increased from pH 0 to 13.5. (2) At 4.5 ⩽ pH ⩽ 12,
G
e-
= 2.8 and
G
HO
= 2.3, but as the pH is increased to 13.5 both these quantities increase by about 1 unit, an effect which is attributed to the reaction of OH
-
with
either
radical pairs (H + OH)
or
excited water molecules H
2
O*, i.e. (H + OH) or H
2
O* + OH
-
→ e
aq
. + OH. (3) Solutes are divisible into three categories according as they (a) react with e
aq
. only,
or
(b) quench H
2
O*, or provide an alternative route for H + OH recombination, or (c) react with
e
aq
and H atoms to give distinguishable stable products. (4)
k
(
e
-
aq
. +ferricyanide)/
k
(e
aq
._ + N
2
O) = 0.60 + 0.15 at [i = 0.013 but increases with u in a way which indicates that e
aq
. has unit negative charge and survives long enough for the establishment of its ionic atmosphere. (5)
k
(e
aq
. +H
+
aq.
)/
k
(e
aq
._ + N
2
O) = 0.65 + 0.35, +acrylamide)/
k
(e
aq
. + N
2
O) = 1.2 + 0.2 and
k
(H + ferrieyanide)/
k
(H + N
2
O) = 625+100. The passage of a fast charged particle through aqueous systems causes ionizati
Reference4 articles.
1. Decomposition of Water and Aqueous Solutions under Mixed Fast Neutron and γ-Radiation
2. Trans;Collinson E .;Faraday,1959
3. Baxendale J . H . & H ughes G. 1958 Z. phys. Chem.
4. Proc. Roy;Bedford T. G.;Soc. A,1909
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