Ecological Assessment of Storm Impacts

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Data Collection

Alachlor

CAS Number: 15972-60-8

Basic Information

The chemical structure of Alachlor Synonym(s): 2-chloro-2',6'-diethyl-N-(methoxymethyl)acetanilide; 2-Chloro-N-(2,6-diethylphenyl)-N-(methoxymethyl)acetamide; Metachlor; Alamex; Alanex; Alanox; Ala-Scept; Alazine; Alochlor
Formula: C14H20ClNO2
 Molecular Weight: 269.771
 Boiling Point (°C): 100 (.02mm Hg)
Melting Point (°C): 39.5 - 41.5
 Contaminant Type: Alachlor is an herbicide.

Solubility (in water)

  • Solubility: 242 mg/l g
    Temperature (°C): 25
  • Solubility: 148 mg/l e
    Temperature (°C): 20

Half-Life (in soil unless otherwise noted)

  • t1/2: 23 days e
    Temperature (°C): 20
     Environment: Aerobic, 0.0-0.6 meters, loamy soil
  • t1/2: 100 days e
    Temperature (°C): 20
     Environment: Anaerobic, 0.0-0.6 meters, loamy soil
  • t1/2: 73 days e
    Temperature (°C): 20
     Environment: Aerobic, 0.6-2.4 meters, vandose soil
  • t1/2: 144 days e
    Temperature (°C): 20
     Environment: Anaerobic, 0.6-2.4 meters, vandose soil
  • t1/2: 104 days e
    Temperature (°C): 20
     Environment: Aerobic, 2.4-4.3 meters, vandose soil
  • t1/2: 110 days e
    Temperature (°C): 20
     Environment: Anaerobic, 2.4-4.3 meters, vandose soil
  • t1/2: 116 days e
    Temperature (°C): 20
     Environment: Aerobic, 4.3-6.3 meters, vandose soil
  • t1/2: 53 days e
    Temperature (°C): 20
     Environment: Anaerobic, 4.3-6.3 meters, vandose soil
  • t1/2: 22 days e
    Temperature (°C): 20
     Environment: Aerobic, 6.3-8.3 meters, vandose soil
  • t1/2: 57 days e
    Temperature (°C): 20
     Environment: Anaerobic,6.3-8.3 meters, vandose soil
  • t1/2: 285 days e
    Temperature (°C): 20
     Environment: Aerobic,8.3-9.6 meters, vandose soil
  • t1/2: 148 days e
    Temperature (°C): 20
     Environment: Anaerobic,8.3-9.6 meters, vandose soil
  • t1/2: 324 days e
    Temperature (°C): 20
     Environment: Aerobic, 9.6-11.6 meters, aquifer
  • t1/2: 337 days e
    Temperature (°C): 20
     Environment: Anaerobic, 9.6-11.6 meters,aquifer
  • t1/2: 320 days e
    Temperature (°C): 20
     Environment: Aerobic, 13.1-15.2 meters, aquifer
  • t1/2: 553 days e
    Temperature (°C): 20
     Environment: anaerobic,13.1-15.2 meters,aquifer

Toxicity Effects

  • Organism Type: Birds g
    Common Name: bobwhite quail
     Scientific Name: Colinus virginianus
     Toxicity: >2510 mg/kg
     Test: LD50
     Formulation: Lasso II
  • Organism Type: Crustaceans ce
    Scientific Name: Ceriodaphnia dubia
     Toxicity: 7.9 mg/l
     Test: 48h LC50
  • Organism Type: Crustaceans g
    Common Name: Daphnia
     Scientific Name: Daphnia magna
     Toxicity: 22 mg/l
     Test: 48h EC50
     Formulation: Lasso
  • Organism Type: Crustaceans g
    Common Name: Daphnia
     Scientific Name: Daphnia magna
     Toxicity: 10 mg/l
     Test: 48h EC50
  • Organism Type: Fish g
    Common Name: Bluegill
     Scientific Name: Lepomis macrochirus
     Toxicity: 6.2 mg/l
     Test: 96h LC50
    Formulation: Lasso
  • Organism Type: Fish g
    Common Name: Rainbow trout
     Scientific Name: Oncorhynchus mykiss
    Toxicity: 3.7 mg/l
     Test: 96h LC50
    Formulation: Lasso
  • Organism Type: Mammals g
    Common Name: Rat
     Scientific Name: Muridae (Family)
     Toxicity: 930-1350 mg/kg
     Test: LD50
  • Organism Type: Mammals c
    Common Name: Rat
     Scientific Name: Muridae (Family)
     Toxicity: 2000 mg/kg
     Test: LD50
     Formulation: Lasso RU
  • Organism Type: Mammals g
    Common Name: Rat
     Scientific Name: Muridae (Family)
     Toxicity: 2000 mg/kg
     Test: LD50
     Formulation: Lasso
  • Organism Type: Mammals g
    Common Name: Rat
     Scientific Name: Muridae (Family)
     Toxicity: >5000 mg/kg
     Test: LD50
     Formulation: Lasso II
  • Organism Type: Mammals g
    Common Name: Rat
     Scientific Name: Muridae (Family)
     Toxicity: >5000 mg/kg
     Test: LD50
     Formulation: Micro-Tech

Octanol-Water Partition Coefficients

  • Log Kow: 2.8 e

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

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.
ce Oris, J.T., R.W. Winner, and M.V. Moore. 1991. A four day survival and reproduction toxicity test for Ceriodaphnia dubia. Environmental Toxicology and Chemistry 10:217-224.