Environmental Engineering Reference
In-Depth Information
Fenitrothion
, an organophosphorus insecticide, on photodegradation in oxygenated solu-
tion by UV irradiation undergoes isomerization, oxidation, and hydrolysis to form prod-
ucts as (Derbalah et al. 2004)
CH
3
S
CH
3
O
P
O
CH
3
O
CH
3
CH
3
CH
3
O
S
O
CH
3
S
CH
3
O
CH
3
O
NO
2
O
O
NO
2
P
O
NO
2
P
P
CH
3
O
CH
3
O
CH
3
O
O
COOCH
3
CH
3
O
S
CH
3
O
NO
2
O
P
O
NO
2
P
CH
3
O
CH
3
O
O
CH
3
CH
3
O
O
CH
3
O
P
NO
2
OCH
3
NO
2
CH
3
O
HO
P
SCH
3
CH
3
O
CH
3
O
CH
3
CH
3
HO
Chlorpyrifos
, a broad-spectrum insecticide, on photolysis in the presence of UV light
undergoes oxidative desulfuration, dehalogenation, and hydrolytic reactions as
Cl
Cl
Cl
Cl
Cl
h
ν
S
S
OC
2
H
5
OC
2
H
5
Cl
Cl
Cl
O
N
O
P
N
P
N
OH
OC
2
H
5
OC
2
H
5
Cl
Cl
Cl
O
O
OC
2
H
5
OC
2
H
5
Cl
Cl
O
N
O
P
P
N
OC
2
H
5
OC
2
H
5
Phosalone
, 5-6-chloro-2,3-dihdyro-2-oxobenzoxazol-3-yl methyl O,O-diethyl phosphoro-
dithioate, a broad-spectrum nonionic insecticide, on photochemical reaction undergoes
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