Agent Name


CAS Number




Major Category



Chinorta; Chinorto; Diaethyl-p-nitrophenylphosphorsaeureester [German]; Diethyl 4-nitrophenyl phosphate; Diethyl p-nitrophenyl phosphate; Diethyl paraoxon; Diethyl-p-nitrofenyl ester kyseliny fosforecne [Czech]; Diethylparaoxon; E 600; E 600 (pesticide); ENT 16,087; Ester 25; Ethyl p-nitrophenyl ethylphosphate; Ethyl paraoxan; Ethyl paraoxon; Eticol; Fosfakol; HC 2072; Mintaco; Mintacol; Mintisal; Miotisal; Miotisal A; O,O'Diaethyl-p-nitrophenylphosphat [German]; O,O-Diethyl O-p-nitrophenyl phosphate; O,O-Diethyl phosphoric acid O-p-nitrophenyl ester; O,O-Dietyl-O-p-nitrofenylfosfat [Czech]; Oxyparathion; Paraoxone; Paroxan; Pestox 101; Phenol, p-nitro-, ester with diethyl phosphate; Phosphachole; Phosphacol; Phosphakol; Phosphoric acid diethyl 4-nitrophenyl ester; Phosphoric acid, diethyl p-nitrophenyl ester; Soluglacit; Soluglaucit; Ts 219; p-Nitrophenyl diethyl phosphate; p-Nitrophenyl diethylphosphate; [ChemIDplus] UN3018


Organophosphate Insecticides


Reddish-yellow odorless liquid; [Hawley] Mild fruity odor; [CAMEO]


Used as insecticide; [Merck Index] A metabolite of the pesticide parathion (formed by microbial degradation, chemical oxidation, irradiation, and conversion in air promoted by sunlight); Formerly used to treat glaucoma; [HSDB]


The oxygen analog of parathion; A cholinesterase inhibitor; [Hawley] May have detrimental effects on immune and hematopoietic systems; Mutagenic effects to Salmonella and Schizosaccharomyces pombe and sister chromatid exchanges in hamster ovary cells; No evidence of delayed neurotoxicity in study with hens; [HSDB] The average of two baseline respective cholinesterase activity determinations three days apart, with no exposures to enzyme inhibiting pesticides for at least 30 days, is recommended for each worker prior to exposure to cholinesterase inhibitors because of large inter-individual differences in published baseline values. To be established at least once a year. Removal from workplace exposures is recommended until the cholinesterase activity returns to within 20% of baseline. [TLVs and BEIs] See "Parathion."


Not registered for use as pesticide in the US; [HSDB]

Exposure Assessment

Acetylcholinesterase activity in red blood cells = 70% of individual's baseline; Butylcholinesterase activity in serum or plasma = 60% of individual's baseline; Sample at end of shift; [TLVs and BEIs]

Vapor Pressure

1.1E-6 mm Hg

Explanatory Notes

The Guide in the Emergency Response Guidebook is for "Organophosphorus pesticide, liquid, toxic."

Adverse Effects
Other Poison


Links to Other NLM Databases
Health Studies

Human Health Effects from Hazardous Substances Data Bank:

Toxicity Information


Chemical Information

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Biomedical References

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Related Information in HazMap

Occupational diseases associated with exposure to this agent:


Industrial Processes with risk of exposure: