Ecological Assessment of Storm Impacts

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Data Collection

Benefin

CAS Number: 1861-40-1

Basic Information

The chemical structure of Benefin Synonym(s): Benfluralin; Balan; Benefin
Formula: C13H16F3N3O4
 Molecular Weight: 335.282
 Boiling Point (°C): 121 - 148
 Melting Point (°C): 65-66
 Contaminant Type: Benefin is an herbicide.
Notes: Yellow-orange crystalline solid

Solubility (in water)

  • Solubility: 0.1 mg/l g
    Temperature (°C): 25
     pH Value: 7
  • Solubility: < 1 mg/l e
    Temperature (°C): 25

Half-Life (in soil unless otherwise noted)

  • t1/2: 21-120 days f
    Environment: Based upon aerobic soil die-away test data for two different soils

Toxicity Effects

  • Organism Type: Crustaceans e
    Scientific Name: Gammarus fasciatus
     Toxicity: 1100 µg/l
     Test: 96h LC50
  • Organism Type: Fish e
    Common Name: Bluegill
     Scientific Name: Lepomis macrochirus
     Life Stage: Fingerlings
     Toxicity: 0.37 mg/l
     Test: LC50
  • Organism Type: Fish e
    Common Name: Harlequin fish
     Scientific Name: Rasbora heteromorpha
     Toxicity: 1.0 mg/l
     Test: 24h LC10,F
  • Organism Type: Fish e
    Common Name: Harlequin fish
     Scientific Name: Rasbora heteromorpha
     Toxicity: 1.4 mg/l
     Test: 24h LC50,F
  • Organism Type: Fish e
    Common Name: Harlequin fish
     Scientific Name: Rasbora heteromorpha
     Toxicity: 1.0 mg/l
     Test: 3m LC50,F extrap
  • Organism Type: Fish e
    Common Name: Harlequin fish
     Scientific Name: Rasbora heteromorpha
     Toxicity: 0.95 mg/l
     Test: 48h LC10,F
  • Organism Type: Fish e
    Common Name: Harlequin fish
     Scientific Name: Rasbora heteromorpha
     Toxicity: 1.3 mg/l
     Test: 48h LC50,F
  • Organism Type: Fish e
    Common Name: Harlequin fish
     Scientific Name: Rasbora heteromorpha
     Toxicity: 1.2 mg/l
     Test: 96h LC50,F
  • Organism Type: Mammals g
    Common Name: Rat
     Scientific Name: Muridae (Family)
     Toxicity: >7000 mg/kg
     Test: LD50
  • Organism Type: Mammals c
    Common Name: Rat
     Scientific Name: Muridae (Family)
     Toxicity: 500 mg/kg
     Test: LD50

Octanol-Water Partition Coefficients

  • Log Kow: 5.3 e
    Formulation: at 20C pH 7

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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.
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.