Ecological Assessment of Storm Impacts

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Data Collection

Diflubenzuron

CAS Number: 35367-38-5

Basic Information

The chemical structure of Diflubenzuron Synonym(s): 1-(4-chlorophenyl)-3-(2,6-difluorobenzoyl)urea; Difluron; Dimilin; DU 112307; Largon; Micromite; N-(((4-chlorophenyl)amino)carbonyl)-2,6-difluorobenzamide; PDD 6040-I
Formula: C14H9ClF2N2O2
 Molecular Weight: 310.687
 Melting Point (°C): 230 - 232
 Contaminant Type: Diflubenzuron is an insecticide.

Solubility (in water)

  • Solubility: 0.08 mg/l g
    Temperature (°C): 20
  • Solubility: 0.2 mg/l e
    Temperature (°C): 20

Half-Life (in soil unless otherwise noted)

  • t1/2: 0.5-2 weeks e
    Environment: Depending upon soil type, moisture content, and organic matter content
  • t1/2: 3-4 days g
    Environment: Soil WP (ave. particle size 2-3 micron)
  • t1/2: 4-120 days a
    Environment: Depending upon particle size

Toxicity Effects

  • Organism Type: Birds g
    Common Name: Mallard
     Scientific Name: Anas platyrhynchos
     Toxicity: >4640 mg/kg
     Test: 8d LC50
  • Organism Type: Birds g
    Common Name: bobwhite quail
     Scientific Name: Colinus virginianus
     Toxicity: >4640 mg/kg
     Test: 8d LC50
  • Organism Type: Crustaceans e
    Common Name: Clam shrimp
     Toxicity: <0.01 µg/l
     Test: EC50
     Notes: mortality in 24-48 hours
  • Organism Type: Crustaceans e
    Common Name: Tadpole shrimp
     Toxicity: <0.01 µg/l
     Test: EC50
     Notes: mortality in 24-48 hours
  • Organism Type: Crustaceans e
    Scientific Name: Artemia salina
     Toxicity: 2 µg/l
     Test: EC50
     Notes: rapid decline
  • Organism Type: Crustaceans a
    Common Name: Daphnia
     Scientific Name: Daphnia magna
     Toxicity: 1.5 µg/l
     Test: 96h LC50
  • Organism Type: Crustaceans e
    Common Name: Mysid shrimp
     Scientific Name: Mysidopsis bahia
     Toxicity: 1.2 µg/l
     Test: 21d LC50
  • Organism Type: Crustaceans e
    Common Name: Mysid shrimp
     Scientific Name: Mysidopsis bahia
     Toxicity: 2.1 µg/l
     Test: 96h LC50
  • Organism Type: Crustaceans e
    Common Name: Mysid shrimp
     Scientific Name: Mysidopsis bahia
     Toxicity: 0.075 mg/l
     Test: EC50
     Notes: sig. rep. decl.
  • Organism Type: Fish e
    Common Name: Channel catfish
     Scientific Name: Ictalurus punctatus
     Toxicity: 1.19 mmol/l
     Test: 96h LC50
  • Organism Type: Fish e
    Common Name: Channel catfish
     Scientific Name: Ictalurus punctatus
     Toxicity: 370 mg/l
     Test: 96h LC50,S
  • Organism Type: Fish e
    Common Name: Bluegill
     Scientific Name: Lepomis macrochirus
     Toxicity: 2.12 mmol/l
     Test: 96h LC50
  • Organism Type: Fish g
    Common Name: Bluegill
     Scientific Name: Lepomis macrochirus
     Toxicity: 135 mg/l
     Test: 96h LC50
  • Organism Type: Fish e
    Common Name: Bluegill
     Scientific Name: Lepomis macrochirus
     Toxicity: 660 mg/l
     Test: 96h LC50,S
  • Organism Type: Fish e
    Common Name: Inland silverside, tidewater silverside
     Scientific Name: Menidia beryllina
     Toxicity: 2.1 µg/l
     Test: 96h LC50
  • Organism Type: Fish e
    Common Name: Inland silverside, tidewater silverside
     Scientific Name: Menidia beryllina
     Toxicity: 0.27-1.77 µg/l
     Test: MATC
     Notes: early life stage
  • Organism Type: Fish e
    Common Name: Coho salmon or silver salmon
     Scientific Name: Oncorhynchus kisutch
     Life Stage: Juvenile
     Toxicity: 1000 mg/l
     Test: 15min LC0
  • Organism Type: Fish e
    Common Name: Coho salmon or silver salmon
     Scientific Name: Oncorhynchus kisutch
     Life Stage: Juvenile
     Toxicity: >150 mg/l
     Test: 96h LC50
  • Organism Type: Fish g
    Common Name: Rainbow trout
     Scientific Name: Oncorhynchus mykiss
    Toxicity: 140 mg/l
     Test: 96h LC50
  • Organism Type: Fish e
    Common Name: Rainbow trout
     Scientific Name: Oncorhynchus mykiss
    Toxicity: 250 mg/l
     Test: 96h LC50,S
  • Organism Type: Fish e
    Common Name: Mozambique tilapia
     Scientific Name: Oreochromis mossambicus
     Toxicity: 800 mg/l
     Test: LC50
  • Organism Type: Fish e
    Common Name: Fathead minnow
     Scientific Name: Pimephales promelas
     Toxicity: 1.38 mmol/l
     Test: 96h LC50
  • Organism Type: Fish e
    Common Name: Fathead minnow
     Scientific Name: Pimephales promelas
     Toxicity: 430 mg/l
     Test: 96h LC50,S
  • Organism Type: Fish e
    Common Name: Columbia River redband trout
     Scientific Name: Salmo gairdneri
     Toxicity: 0.77 mmol/l
     Test: 96h LC50
  • Organism Type: Mammals g
    Common Name: Rat
     Scientific Name: Muridae (Family)
     Toxicity: >4640 mg/kg
     Test: LD50

Octanol-Water Partition Coefficients

  • Log Kow: 3.1 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

a Beyond pesticides fact sheets. Pages retrieved November, 2003 from http://www.beyondpesticides.org. Beyond Pesticides, Washington, DC.
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.