Chemistry Reference
In-Depth Information
OSO
3
-
O
O
•
(11)
SO
4
•-
R
′
+
R
′
HO
R
R
O
σ
adduct
O
R
′
•
+
+H
2
O, -H
+
R
RC
HO
(12)
-SO
4
=
H
O
•
H
O
-
O
3
SO
•
R
′
+ H
2
O -H
+
-SO
4
-
HO
R
′
HO
R
(13)
R
HO
-HSO
4
-
σ
adduct
HCHD
-H
2
O
O
•
O
R
′
R
HO
PR
+
R = NH
3
R´ = O
—
NH
—
CH
2
—
COO
-
Tyr-Gly:
+
R =
—
NH
—COO—CH
2
—NH
3
R´ = O
-
Tyr-Gly:
Figure 5.19.
Scheme proposed for the reactions of Tyr-gly and gly-Tyr with sulfate
radicals. (adapted from [377] with the permission of the Royal Society of Chemistry).
the phosphate radicals are formed in sunlight irradiated natural waters con-
taining phosphate ions or during advanced oxidation treatments of contami-
nated waters. The fate of the pollutants in both cases was affected by the
presence of the phosphate radicals. The chemistry of phosphate radicals is
briefly described below.
5.4.1.1 Generation, Equilibria, and Spectral Characteristics.
The reaction
of
•
OH and
SO
•−
with phosphates results in the formation of phosphate radi-
cals (Eqs. 5.66-5.69) [347, 386]:
•
•
6
H PO
+
OH H PO H O
→
+
k
=
2 6 10
.
×
/M/s
(5.66)
3
4
2
4
2
66
H PO
−
•
•
•
−
6
(5.67)
+
OH H PO /HPO OH /H O
→
+
k
=
2 2 10
.
×
/M/s
2
4
2
4
4
2
67
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