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EC number: 223-296-5
CAS number: 3811-73-2
The total OH radical reaction rate
constant (kOH) is given by:
(H-atom abstraction from C-H and O-H bonds)
k (OH radical addition to aromatic rings)
k (OH radical addition to fused rings)
k (OH radical interaction with N-, S- and OH-containing groups)
For Sodium pyrithione kOHis:
kOH= k (H-atom abstraction
from C-H and O-H bonds) + k (OH radical interaction with N-, S- and
OH-containing groups) + k (OH radical addition to aromatic rings) + k
(OH radical addition to fused rings)
The hydrogen abstraction (H-atom
abstraction from C-H bonds) has a value of
= 0.0000 cm3molecule-1sec-1(no hydrogen
The OH radical interaction with N- and
OH-containing groups has a value of
= 0.0000 × 10-12cm3molecule-1sec-1(aromatic
The OH radical addition to aromatic
rings has a value of
k = 2.3854 × 10-12cm3molecule-1sec-1
The OH radical addition to fused rings
has a value of
k = 0.000 × 10-12cm3molecule-1sec-1
The overall OH rate constant is
estimated to be:
2.3854 × 10-12cm3molecule-1sec-1.
The tropospherical half life is
calculated from the overall OH radical reaction rate constant using the
t1/2 = ln2/KOH x [OH]
[OH] = the model default OH radical
concentration in the troposphere of 1.5 x 106molecule-cm3(12
hours irradiation per day).
For zinc pyrithione the calculated
tropospherical half life is:
0.693/(2.3854E-12 x 1.5E6) = 193678
seconds = 53.8 hours
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