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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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