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Agent Name EPN
Alternative Name O-Ethyl-O-(4-nitrophenyl)phenylthiophosphonate
CAS Number 2104-64-5
Formula C14-H14-N-O4-P-S
Major Category Pesticides
Synonyms O-Ethyl O-(4-nitrophenyl) benzenephosphonothioate; Ethyl p-nitrophenyl benzenethionophosphonate; O-Ethyl-O-(4-nitrophenyl)phenylthiophosphonate;
Category Organophosphates
Description Yellow solid with an aromatic odor. [pesticide] [Note: A brown liquid above 97 degrees F.] [NIOSH]
Comments A small number of the organophosphates (OPs) can Induce Delayed Neuropathy (OPIDN). OPIDN usually occurs after ingestion and is usually nonoccupational. [Levy, p. 572]
Restricted "No ACTIVE registrants found for selected chemical." [NPIRS] Use as mosquito larvacide cancelled in 1983; All registrations voluntarily cancelled in 1987; [EPA: Status of Chemicals in Special Review]
Exposure Assessment
BEI Cholinesterase activity in red cells = 70% of individual's baseline, sample time discretionary; [ACGIH]
Skin Designation (ACGIH) Yes
TLV (ACGIH) 0.1 mg/m3, inhalable fraction
PEL (OSHA) 0.5 mg/m3
MAK 0.5 mg/m3, inhalable fraction
IDLH (NIOSH) 5 mg/m3
Vapor Pressure 9.5 x 10 -07 mm Hg
Adverse Effects
Neurotoxin Motor Neuropathy
Other Poison Organophosphate
Links to Other NLM Databases
Health Studies Human Health Effects from Hazardous Substances Data Bank: EPN  
Toxicity Information Search TOXNET
Chemical Information Search ChemIDplus
Related Information in Haz-Map
Diseases Occupational diseases associated with exposure to this agent:





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Last updated: January, 2009