Ecological Assessment of Storm Impacts

Data Collection

Tebuthiuron

Basic Information

Synonym(s): 1-(5-tert-Butyl-1,3,4-thiadiazol-2-yl)-1,3-dimethylurea; Graslan; Graslan 40P; N-[5-(1,1-dimethylethyl)-1,3,4-thiadiazol-2-yl]-N,N'-dimethylurea; Perflan; Spike 20P; Spike 40P; Spike 40W; Spike 5G; Spike 80W; Spike DF; Spike
Formula: C₉H₁₆N₄OS
Molecular Weight: 228.31
Melting Point (°C): 161.5 - 164
Contaminant Type: Tebuthiuron is an herbicide.

Solubility (in water)

• Solubility: dispersible ^g
  Formulation: dry flowable and wettable powder

• Solubility: insoluble but disintegrate ^g
  Formulation: pellets

• Solubility: insoluble ^g
  Formulation: granules

• Solubility: 2500 mg/l ^h
  Temperature (°C): 25
  

• Solubility: 2.3-2.5 g/l ^k
  Temperature (°C): 25
  

Half-Life (in soil unless otherwise noted)

• t1/2: 12-15 months ^h
  Environment: in areas with over 40 inches annual rainfall - longer half-lives expected in drier areas or in soils with high organic matter content
  

• t1/2: 12-15 months ^k
  Environment: in areas with over 60 inches annual rainfall
  

Toxicity Effects

• Organism Type: Birds ^h
  Common Name: Mallard
  Scientific Name: Anas platyrhynchos
  Toxicity: >2500 mg/kg
  Test: LD50
  

• Organism Type: Crustaceans ^h
  Common Name: Daphnia
  Scientific Name: Daphnia magna
  Toxicity: 225 mg/l
  Test: 48h LC50
  

• Organism Type: Crustaceans ^h
  Common Name: Pink shrimp
  Scientific Name: Panaeus duorarum
  Toxicity: >48 mg/l
  Test: LD50
  

• Organism Type: Crustaceans ^h
  Common Name: Fiddler crab
  Scientific Name: Uca sp.
  Toxicity: >320 mg/l
  Test: LC50
  

• Organism Type: Fish ^h
  Common Name: Goldfish
  Scientific Name: Carassius auratus
  Toxicity: >160 mg/l
  Test: 96h LC50
  

• Organism Type: Fish ^g
  Common Name: Bluegill
  Scientific Name: Lepomis macrochirus
  Toxicity: 112 mg/l
  Test: 96h LC50
  

• Organism Type: Fish ^g
  Common Name: Rainbow trout
  Scientific Name: Oncorhynchus mykiss
  Toxicity: 144 mg/l
  Test: 96h LC50
  

• Organism Type: Fish ^h
  Common Name: Fathead minnow
  Scientific Name: Pimephales promelas
  Toxicity: >160 mg/l
  Test: 96h LC50
  

• Organism Type: Mammals ^h
  Common Name: Dog
  Scientific Name: Canis (Genus)
  Toxicity: >500 mg/kg
  Test: LD50
  

• Organism Type: Mammals ^h
  Common Name: Cats
  Scientific Name: Felidae (Family)
  Toxicity: >200 mg/kg
  Test: LD50
  

• Organism Type: Mammals ^h
  Common Name: Rabbits
  Scientific Name: Lagomorpha (order)
  Toxicity: 286 mg/kg
  Test: LD50
  

• Organism Type: Mammals ^h
  Common Name: Mouse
  Scientific Name: Muridae (Family)
  Toxicity: 579 mg/kg
  Test: LD50
  

• Organism Type: Mammals ^g
  Common Name: Rat
  Scientific Name: Muridae (Family)
  Toxicity: 644 mg/kg
  Test: LD50
  

Soil Organic Carbon/Water Partition Coefficients

• Koc: 2.79 ^k
  Formulation: log
  

Octanol-Water Partition Coefficients

• Log Kow: 1.7853 ^h
  Formulation: at 25C pH 7
  Notes: Source did not specify type of partition coeffecient or if value was the log

• Log Kow: 1.79 ^k
  

Work Cited