Ecological Assessment of Storm Impacts

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Data Collection

Dimethoate

CAS Number: 60-51-5

Basic Information

The chemical structure of Dimethoate Synonym(s): O,O-Dimethyl methylcarbamoylmethyl phosphorodithioate; O,O-dimethyl S-(2-(methylamino)-2-oxoethyl) phosphorodithioate; O,O-dimethyl S-methylcarbamoylmethyl phosphorodithioate
Formula: C5H12NO3PS2
 Molecular Weight: 229.249
 Boiling Point (°C): 107 (.05mm Hg)
 Melting Point (°C): 52 - 52.5
 Contaminant Type: Dimethoate is an insecticide.
Notes: Crystals, systemic and contact insecticide. White crystalline solid

Solubility (in water)

  • Solubility: 2.5 % g
    Temperature (°C): 21
  • Solubility: 25 g/l e
    Temperature (°C): room

Half-Life (in soil unless otherwise noted)

  • t1/2: 11-37 days f
    Environment: Based upon soil die-away test data for two soils

Toxicity Effects

  • Organism Type: Crustaceans e
    Common Name: Daphnia
     Scientific Name: Daphnia magna
     Toxicity: 210 µg/l
     Test: 16d EC10, growth
  • Organism Type: Fish e
    Common Name: Rosy barb
     Scientific Name: Barbus conchonius
     Toxicity: 434 µg/l
     Test: EC hystology
     Notes: 15d EC histology
  • Organism Type: Fish e
    Common Name: Bluegill
     Scientific Name: Lepomis macrochirus
     Toxicity: 28 mg/l
     Test: 24h LC50
  • Organism Type: Fish e
    Common Name: Rainbow trout
     Scientific Name: Oncorhynchus mykiss
    Toxicity: 20 mg/l
     Test: 24h LC50
  • Organism Type: Fish g
    Common Name: Rainbow trout
     Scientific Name: Oncorhynchus mykiss
    Toxicity: 30.2 mg/l
     Test: 96h LC50
  • Organism Type: Fish e
    Common Name: Columbia River redband trout
     Scientific Name: Salmo gairdneri
     Toxicity: 800-1600 µg/l
     Test: 56d EC, growth
  • Organism Type: Fish e
    Scientific Name: Thiara lineata
     Toxicity: 24 µg/l
     Test: 48h LC50
  • Organism Type: Fish e
    Scientific Name: Thiara scabra
     Toxicity: 36 µg/l
     Test: 48h LC50
  • Organism Type: Mammals g
    Common Name: Rat
     Scientific Name: Muridae (Family)
     Toxicity: 235 mg/kg
     Test: LD50
  • Organism Type: Molluscs e
    Scientific Name: Lymnaea acuminata
     Toxicity: 210 µg/l
     Test: 16d EC10, growth

Octanol-Water Partition Coefficients

  • Log Kow: "-0.70, 2.71" e

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

Work Cited

e Verschueren, K. 1996. Handbook of Environmental Data on Organic Chemicals, 3rd edition. John Wiley & Sons, Inc., New York.
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.