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(a)
N
His
OClO, H
2
O
Fe(III)
HRP
HOClO
N
3
Fe(III)
N
Compound II
His
HOClO
OH
HOCl
Fe(IV)
N
1
HOCl/
-
OCl, H
+
OClO
ClO
2
Cl
-
N
OClO
HOClO
His
Compound I
O
N
Fe(IV)
(b)
7
Compound I Formation
6
5
Compound I Reduction
4
Compound 2 Reduction
3
2
1
3
4
5
6
7
8
9
pH
Figure 3.13.
(a) Scheme showing the individual reaction steps of the system HRP/
chlorite including the reactions of the reaction products chlorine dioxide and hypo-
chlorite with ferric HRP. Note that the two-electron reduction product of chlorine
dioxide (i.e., ClO) is only speculative. (b) pH dependence of apparent bimolecular rate
constants of reactions involving chlorite, that is, compound I formation and reduction
as well as compound II reduction (adapted from Jakopitsch et al. [126] with the permis-
sion of Elsevier Inc.).
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