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Mass spectrum of parathion


A highly toxic organic phosphate Insecticide. Parathion was introduced in 1947. The pale yellow liquid acts as a cholinesterase inhibitor. It interrupts the function of the central nervous system and causes death by respiratory failure.



Synonyms and Related Terms

O,O-diethyl-O,p-nitrophenyl phosphorothioate; ethyl parathion; O,O-diethyl-p-nitrophenyl thiophosphate; AATP; Niran; Penncap-E


  • Highly toxic by skin contact, inhalation or ingestion.
  • Flammable. Flash point = 120-160 C.
  • NIH: Compound summary

Physical and Chemical Properties

Soluble in ester, alcohols, ketones, ethers, aromatic hydrocarbons, oils. Slightly soluble in water. Insoluble in petroleum ether, kerosene.

Composition (C2H5O)2P(S)OC6H4NO2
CAS 56-38-2
Melting Point 6 C
Density 1.26 g/ml
Molecular Weight mol. wt. = 291.27
Refractive Index 1.5367
Boiling Point 375 C

Resources and Citations

  • The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 6897

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