Ecological Assessment of Storm Impacts

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Methyl parathion

CAS Number: 298-00-0

Basic Information

The chemical structure of Methyl parathion Synonym(s): Dimethyl O-p-nitrophenyl thiophosphate; Dimethyl p-nitrophenyl monothiophosphate; Dimethyl 4-nitrophenyl phosphorothionate; Dimethyl p-nitrophenyl thionophosphate; Dimethyl parathion
Formula: C8H10NO5PS
 Molecular Weight: 263.204
 Boiling Point (°C): 143 (1.0mm Hg)
 Melting Point (°C): 36
 Contaminant Type: Methyl parathion is an insecticide.
Notes: White solid
Additional Information: Believed to have little or no potential to contaminate groundwater. g

Solubility (in water)

  • Solubility: 55 mg/l g
    Temperature (°C): 20
  • Solubility: 55 - 60 mg/l ak

Half-Life (in soil unless otherwise noted)

  • t1/2: 10-365 days f
    Notes: Scientific judgement based upon unacclimated aerobic soil grab sample data. Declines rapidly at concentration <100 ppm. Persistant at high application rates
  • t1/2: 17 days ak
    Environment: Nonadapted aerobic subsoil
  • t1/2: >20 days ak
    Environment: Loam and sand
  • t1/2: 17; >20 days ak
    Environment: biodegradation in nonadapted aerobic subsoil - loam and sand
  • t1/2: h
  • t1/2: 10-365 days f
    Environment: Scientific judgement based upon unacclimated aerobic soil grab sample data. Degrades rapidly at concentration <100 ppm. Persistant at high application rates (high t1/2)

Toxicity Effects

  • Organism Type: Crustaceans ak
    Scientific Name: Branchiopoda (Class)
     Toxicity: 2.4 µg/l
     Test: EC50
     Formulation: per species
  • Organism Type: Crustaceans ak
    Common Name: Sand shrimp, sevenspine bay shrimp
     Scientific Name: Crangon septemspinosa
     Toxicity: 2 µg/l
     Test: 96h LC50,S
  • Organism Type: Crustaceans ak
    Common Name: Daphnia
     Scientific Name: Daphnia magna
     Toxicity: 12 µg/l
     Test: 2d LC50
  • Organism Type: Crustaceans ak
    Common Name: Daphnia
     Scientific Name: Daphnia magna
     Toxicity: 5 µg/l
     Test: 48h IC50
  • Organism Type: Crustaceans ak
    Common Name: Long-armed hermit crab
     Scientific Name: Pagurus longicarpus
     Toxicity: 7 µg/l
     Test: 96h LC50,S
  • Organism Type: Crustaceans ak
    Common Name: Common grass shrimp
     Scientific Name: Palaemonetes vulgaris
     Toxicity: 3 µg/l
     Test: 96h LC50,S
  • Organism Type: Fish ak
    Common Name: American eel
     Scientific Name: Anguilla rostrata
    Toxicity: 17 mg/l
     Test: 96h LC50,S
  • Organism Type: Fish ak
    Common Name: American eel
     Scientific Name: Anguilla rostrata
    Toxicity: 6.3 mg/l
     Test: 96h LC50,S
  • Organism Type: Fish ak
    Common Name: Zebra danio
     Scientific Name: Brachydanio rerio
     Toxicity: 5.4 mg/l
     Test: 96h LC50
  • Organism Type: Fish ak
    Common Name: Carp
     Scientific Name: Cyprinus carpio
     Toxicity: 15 mg/l
     Test: 96h LC50,S
  • Organism Type: Fish ak
    Common Name: Banded killifish
     Scientific Name: Fundulus diaphanus
    Toxicity: 15 mg/l
     Test: 96h LC50,S
  • Organism Type: Fish ak
    Common Name: Mummichog
     Scientific Name: Fundulus heteroclitus
    Toxicity: 8; 58 mg/l
     Test: 96h LC50,S
  • Organism Type: Fish ak
    Common Name: Striped killifish
     Scientific Name: Fundulus majalis
     Toxicity: 14 mg/l
     Test: 96h LC50,S
  • Organism Type: Fish ak
    Common Name: Black bullhead
     Scientific Name: Ictalurus melas
     Toxicity: 6.6 mg/l
     Test: 96h LC50
  • Organism Type: Fish ak
    Common Name: Channel catfish
     Scientific Name: Ictalurus punctatus
     Toxicity: 5.7 mg/l
     Test: 96h LC50
  • Organism Type: Fish ak
    Common Name: Pumpkinseed
     Scientific Name: Lepomis gibbosus
     Toxicity: 3.6 mg/l
     Test: 96h LC50,S
  • Organism Type: Fish ak
    Common Name: Bluegill
     Scientific Name: Lepomis macrochirus
     Toxicity: 5.7 mg/l
     Test: 24h LC50
  • Organism Type: Fish ak
    Common Name: Bluegill
     Scientific Name: Lepomis macrochirus
     Toxicity: 5.7 ppm
     Test: 24h LC50
  • Organism Type: Fish ak
    Common Name: Bluegill
     Scientific Name: Lepomis macrochirus
     Toxicity: 5.2; 5.7 mg/l
     Test: 96h LC50
  • Organism Type: Fish ak
    Common Name: Inland silverside, tidewater silverside
     Scientific Name: Menidia beryllina
     Toxicity: 0.77 µg/l
     Test: 96h LC50
  • Organism Type: Fish ak
    Common Name: Inland silverside, tidewater silverside
     Scientific Name: Menidia beryllina
     Toxicity: 0.77 µg/l
     Test: 96h LC50
  • Organism Type: Fish ak
    Common Name: Atlantic silverside
     Scientific Name: Menidia menidia
     Toxicity: 0.77 µg/l
     Test: 96h LC50
  • Organism Type: Fish ak
    Common Name: Atlantic silverside
     Scientific Name: Menidia menidia
     Toxicity: 5.7 ppm
     Test: 96h LC50,S
  • Organism Type: Fish ak
    Common Name: Atlantic silverside
     Scientific Name: Menidia menidia
     Toxicity: 5.7 mg/l
     Test: 96h LC50,S
  • Organism Type: Fish ak
    Common Name: Largemouth bass
     Scientific Name: Micropterus salmoides
     Toxicity: 5.2 mg/l
     Test: 96h LC50
  • Organism Type: Fish ak
    Common Name: White perch
     Scientific Name: Morone americana
     Toxicity: 14 mg/l
     Test: 96h LC50,S
  • Organism Type: Fish ak
    Common Name: Striped bass
     Scientific Name: Morone saxatilis
    Toxicity: 14 mg/l
     Test: 96h LC50,S
  • Organism Type: Fish ak
    Common Name: Striped mullet
     Scientific Name: Mugil cephalus
     Toxicity: 5.2 ppm
     Test: 96h LC50,S
  • Organism Type: Fish ak
    Common Name: Coho salmon or silver salmon
     Scientific Name: Oncorhynchus kisutch
     Toxicity: 5.3 mg/l
     Test: 96h LC50
  • Organism Type: Fish ak
    Common Name: Rainbow trout
     Scientific Name: Oncorhynchus mykiss
    Toxicity: 2.7 ppm
     Test: 24h LC50
  • Organism Type: Fish ak
    Common Name: Yellow perch
     Scientific Name: Perca flavescens
     Toxicity: 3.1 mg/l
     Test: 96h LC50
  • Organism Type: Fish ak
    Common Name: Fathead minnow
     Scientific Name: Pimephales promelas
     Toxicity: 8.9 mg/l
     Test: 96h LC50
  • Organism Type: Fish ak
    Common Name: Guppy
     Scientific Name: Poecilia reticulata
    Toxicity: 6.2 mg/l
     Test: 96h LC50,S
  • Organism Type: Fish ak
    Common Name: Columbia River redband trout
     Scientific Name: Salmo gairdneri
     Toxicity: 2.8 mg/l
     Test: 96h LC50
  • Organism Type: Fish ak
    Common Name: Brown trout
     Scientific Name: Salmo trutta
     Toxicity: 4.7 mg/l
     Test: 96h LC50
  • Organism Type: Fish ak
    Common Name: Northern puffer
     Scientific Name: Sphaeroides maculatus
     Toxicity: 76 ppm
     Test: 96h LC50,S
  • Organism Type: Fish ak
    Common Name: Bluehead
     Scientific Name: Thalassoma bifasciatum
     Toxicity: 12 mg/l
     Test: 96h LC50,S
  • Organism Type: Fish ak
    Common Name: Bluehead
     Scientific Name: Thalassoma bifasciatum
     Toxicity: 12 ppm
     Test: 96h LC50,S
  • Organism Type: Mammals g
    Common Name: Rat
     Scientific Name: Muridae (Family)
     Toxicity: 6 mg/kg
     Test: LD50

Octanol-Water Partition Coefficients

  • Log Kow: 2.04 ak

Resource Map: Click below to open in a new window to view or print.
Potential applications of this contaminant in the St. Johns Water River Management District

Work Cited

f Howard, P. H., R. S. Boethling, W. F. Jarvis, W. M. Meylan, and E. M. Michalenko. 1991. Handbook of Environmental Degradation Rates. Lewis Publishers., Chelsea, MI.
g Meister, R. T., and C. Sine (Ed). 2003. Crop Protection Handbook, volume 89. Meister Publishing Company, Willoughby, OH.
h Extension Toxicology Network. Pages retrieved November, 2003 from http://ace.orst.edu/info/extoxnet/. Oregon State University, Corvallis, OR.
ak Verschueren, K. 2001. Handbook of Environmental Data on Organic Chemicals, 4th edition. John Wiley & Sons, Inc., New York.