Ecological Assessment of Storm Impacts

Data Collection

2,4-DB

Basic Information

Synonym(s): 2,4-dichlorophenoxybutyric acid; 2,4-DB; 2,4-DB acid; 2,4-DB amine; 4-(2,4-dichlorophenoxy)butanoic acid; 4-(2,4-DB); Butyric acid, 4-(2,4-dichlorophenoxy) ; DB; Embutone; Legumex; Venceweed
Formula: C₁₀H₁₀Cl₂O₃
Molecular Weight: 249.093
Contaminant Type: 2,4-DB is an herbicide.

Solubility (in water)

• Solubility: 46 mg/l ^h
  Temperature (°C): 25
  

Half-Life (in soil unless otherwise noted)

• t1/2: 7 days ^h
  Environment: In soil, 2,4-DB is broken down by the action of soil microbes to the product 2,4-D.
  

Toxicity Effects

• Organism Type: Algae ^e
  Scientific Name: Chlorococcum spp.
  Toxicity: 75-100 mg/l
  Test: 10d EC50
  

• Organism Type: Algae ^e
  Scientific Name: Dunaliella tertiolecta
  Toxicity: 75-100 mg/l
  Test: 10d EC50
  

• Organism Type: Algae ^e
  Scientific Name: Isochrysis galbana
  Toxicity: 75-100 mg/l
  Test: 10d EC50
  

• Organism Type: Algae ^e
  Scientific Name: Phaeodactylum tricornutum
  Toxicity: 150-200 mg/l
  Test: 10d EC50
  

• Organism Type: Birds ^h
  Common Name: Bird
  Scientific Name: Aves (Class)
  Toxicity: >5000 ppm
  Test: LD50
  Notes: waterfowl and upland gamebirds

• Organism Type: Crustaceans ^e
  Scientific Name: Cypridopsis vidua
  Toxicity: 1800 µg/l
  Test: 48h LC50
  

• Organism Type: Crustaceans ^e
  Common Name: Daphnia
  Scientific Name: Daphnia magna
  Toxicity: 5600 µg/l
  Test: 48h LC50
  

• Organism Type: Crustaceans ^e
  Scientific Name: Gammarus fasciatus
  Toxicity: 5900 µg/l
  Test: 96h LC50
  

• Organism Type: Crustaceans ^e
  Scientific Name: Gammarus lacustris
  Toxicity: 440 µg/l
  Test: 96h LC50
  

• Organism Type: Crustaceans ^e
  Scientific Name: Orconectes nais
  Toxicity: 100 mg/l
  Test: 48h NOEC
  

• Organism Type: Crustaceans ^e
  Common Name: Mississippi grass shrimp
  Scientific Name: Palaemonetes kadiakensis
  Toxicity: 1400 µg/l
  Test: 48h LC50
  

• Organism Type: Fish ^h
  Common Name: Bluegill
  Scientific Name: Lepomis macrochirus
  Toxicity: 7.5-17 mg/l
  Test: 96h LC50
  

• Organism Type: Fish ^g
  Common Name: Rainbow trout
  Scientific Name: Oncorhynchus mykiss
  Toxicity: 4 mg/l
  Test: 96h LC50
  

• Organism Type: Fish ^h
  Common Name: Rainbow trout
  Scientific Name: Oncorhynchus mykiss
  Toxicity: 2-14 mg/l
  Test: 96h LC50
  

• Organism Type: Fish ^e
  Common Name: Fathead minnow
  Scientific Name: Pimephales promelas
  Life Stage: Egg
  Toxicity: 300 µg/l
  Test: 10m NOEC
  

• Organism Type: Fish ^e
  Common Name: Fathead minnow
  Scientific Name: Pimephales promelas
  Life Stage: Egg
  Toxicity: 1500 µg/l
  Test: 48h LC50
  

• Organism Type: Fish ^e
  Common Name: Fathead minnow
  Scientific Name: Pimephales promelas
  Life Stage: Egg
  Toxicity: 5600 µg/l
  Test: 96h LC50
  

• Organism Type: Fish ^h
  Common Name: Fathead minnow
  Scientific Name: Pimephales promelas
  Toxicity: 18 mg/l
  Test: 96h LC50
  

• Organism Type: Mammals ^h
  Common Name: Mouse
  Scientific Name: Muridae (Family)
  Toxicity: 400 mg/kg
  Test: LD50
  Formulation: a sodium salt
  

• Organism Type: Mammals ^h
  Common Name: Rat
  Scientific Name: Muridae (Family)
  Toxicity: 370-700 mg/kg
  Test: LD50
  

• Organism Type: Mammals ^h
  Common Name: Rat
  Scientific Name: Muridae (Family)
  Toxicity: 1500 mg/kg
  Test: LD50
  Formulation: a sodium salt
  

• Organism Type: Mammals ^ah
  Common Name: Rat
  Scientific Name: Muridae (Family)
  Toxicity: 1706 mg/kg
  Test: LD50
  Formulation: 2,4-DB 1.75
  

• Organism Type: Mammals ^g
  Common Name: Rat
  Scientific Name: Muridae (Family)
  Toxicity: >2000 mg/kg
  Test: LD50
  Formulation: Butoxone
  

• Organism Type: Mammals ^ah
  Common Name: Rat
  Scientific Name: Muridae (Family)
  Toxicity: >3583 mg/kg
  Test: LD50
  Formulation: 2,4-DB 200
  

Work Cited