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O
O
Cl
OCH
3
OCH
3
Hydrolysis
P
OH
Cl
2
CHCHO
Dichlroacetaldehyde
C
CH
O
P
OCH
3
Cl
OCH
3
Dichlorvos
Dimethylphosphate
O
Cl
2
CHCH
2
OH
22 Dichloroethanol
Cl
OCH3
C
CH
O
P
Cl
2
CHCOOH
Dichloroacetic acid
Cl
OH
Desmethyldichlorvos
O
OCH
3
OH
P
O
OH
OCH
3
CH
3
CH
2
OH
OH
P
Cl
2
CHCHO
Dichlroacetaldehyde
OH
O
CO
2
OH
Carbondi oxide
P
HO
Phosphoric acid
OH
3.2.3  Organophosphorus Pesticides
Organophosphorus pesticides undergo oxidation by chlorine present in soil or water to
convert P=S to P=O group. Organophosphorus esters such as parathion or methidathion
undergo hydrolysis to form alcohol and phosphoric acid (Washburn 2003; Fan and Lio
2009).
S
S
C
2
H
5
O
C
2
H
5
O
H
2
O
NO
2
P
OH
HO
NO
2
P
O
C
2
H
5
O
C
2
H
5
O
Reduction
H
2
O
HO
NH
2
HO
NO
2
HO
H
2
O
HO
NH
2
HO
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