Environmental Engineering Reference
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oxidation readily to form disulfide as a major product and a number of minor products
due to N-CH
2
or S-CH
2
cleavage in addition to dehalogenation.
S
S
CH
2
CH
2
N
N
hν
Phosalone
O = C
O
Cl
O
C = O
Cl
H
2
N
HO
Cl
Coumaphos
, in the presence of oxygen and UV light, undergoes rearrangement to form
degraded products as:
S
O
P
P
H
3
CH
2
CO
H
3
CH
2
CO
H
3
CH
2
CO
S
O
O
O
UV/Nitrogen
atmosphere
O
O
H
3
CH
2
CO
Cl
Cl
CH
3
CH
3
S
P
H
3
CH
2
CO
O
O
H
3
CH
2
CO
Cl
S
CH
3
P
OH
O
OH
H
3
CH
2
CO
H
3
CH
2
CO
Cl
CH
3
Methidathion
, S-2,3-dihydro-5-methoxy-2-oxo-1,3,4-thiadiazol-3yl methyl O,O dimethyl
phosphorodithioate, an insecticide, on photochemical degradation in water and soil
undergoes hydrolysis as
O
C
O
H
3
CO
CH
2
N
S
Hydrolysis
P
S
CH
2
N
S
H
3
CO
SH
S
N
N
OCH
3
OCH
3
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