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Ethyl parathion

CAS Number: 56-38-2

Basic Information

The chemical structure of Ethyl parathion Synonym(s): O,O-diethyl-O-(p-nitrophenyl)thionophosphate; O,O-diethyl-O-p-nitrophenylthiophosphate; niuif-100; Nourithion; Oleoparaphene; oleoparathion; Oleofos 20; OMS 19; PAC; Pacol; Parathion
Formula: C10H14NO5PS
 Molecular Weight: 291.258
 Boiling Point (°C): 375
Melting Point (°C): 6.1
 Contaminant Type: Ethyl parathion is an insecticide.
Notes: Pale yellow to dark brown liquid with an odor similar to garlic
 Additional Information: Ethyl parathion has little to no potential to contaminate groundwater g

Solubility (in water)

  • Solubility: 12.4 mg/l g
    Temperature (°C): 25

Toxicity Effects

  • Organism Type: Crustaceans e
    Common Name: Daphnia
     Scientific Name: Daphnia magna
     Toxicity: 0.8 µg/l
     Test: 24h LC50
  • Organism Type: Crustaceans e
    Common Name: Daphnia
     Scientific Name: Daphnia magna
     Toxicity: 0.37 µg/l
     Test: 48h LC50
  • Organism Type: Crustaceans e
    Common Name: Daphnia
     Scientific Name: Daphnia pulex
     Toxicity: 0.6 µg/l
     Test: 48h LC50
  • Organism Type: Crustaceans e
    Scientific Name: Gammarus fasciatus
     Toxicity: 1.6 µg/l
     Test: 120h LC50
  • Organism Type: Crustaceans e
    Scientific Name: Gammarus fasciatus
     Toxicity: 2.1 µg/l
     Test: 96h LC50
  • Organism Type: Crustaceans e
    Scientific Name: Gammarus lacustris
     Toxicity: 3.5 µg/l
     Test: 96h LC50
  • Organism Type: Crustaceans e
    Scientific Name: Orconectes nais
     Toxicity: 0.04 µg/l
     Test: 96h LC50
  • Organism Type: Crustaceans e
    Common Name: Mississippi grass shrimp
     Scientific Name: Palaemonetes kadiakensis
     Toxicity: 1.5 µg/l
     Test: 96h LC50
  • Organism Type: Crustaceans e
    Scientific Name: Simocephalus serrulatus
     Toxicity: 0.37 µg/l
     Test: 48h LC50
  • Organism Type: Fish e
    Common Name: Mosquitofish
     Scientific Name: Gambusia affinis
     Toxicity: 0.2 mg/l
     Test: 72h LC50,S
  • Organism Type: Fish e
    Common Name: Green sunfish
     Scientific Name: Lepomis cyanellus
     Toxicity: 0.02 mg/l
     Test: 72h LC50,S
  • Organism Type: Fish e
    Common Name: Green sunfish
     Scientific Name: Lepomis cyanellus
     Toxicity: 425 µg/l
     Test: 96h LC50
  • Organism Type: Fish e
    Common Name: Bluegill
     Scientific Name: Lepomis macrochirus
     Toxicity: 65 µg/l
     Test: 96h LC50
  • Organism Type: Fish e
    Common Name: Largemouth bass
     Scientific Name: Micropterus salmoides
     Toxicity: 190 µg/l
     Test: 96h LC50
  • Organism Type: Fish e
    Common Name: Fathead minnow
     Scientific Name: Pimephales promelas
     Toxicity: 1410 µg/l
     Test: 96h LC50
  • Organism Type: Mammals g
    Common Name: Rat
     Scientific Name: Muridae (Family)
     Toxicity: ~2 mg/kg
     Test: LD50

Octanol-Water Partition Coefficients

  • Log Kow: 3.15 c
    Formulation: Parathion 8 EC
  • Log Kow: 0.59/0.95 e
    Formulation: calculated

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Potential applications of this contaminant in the St. Johns Water River Management District

Work Cited

c C&P Press. 2002. EPR Professional Annual CD. Crop Protection Reference. Chemical and Pharmacuetical Press, Inc., New York, NY.
e Verschueren, K. 1996. Handbook of Environmental Data on Organic Chemicals, 3rd edition. John Wiley & Sons, Inc., New York.
g Meister, R. T., and C. Sine (Ed). 2003. Crop Protection Handbook, volume 89. Meister Publishing Company, Willoughby, OH.