Ecological Assessment of Storm Impacts

Data Collection

Terbacil

Basic Information

Synonym(s): 3-tert-Butyl-5-chloro-6-methyluracil; 5-Chloro-3-(1,1-dimethylethyl)-6-methyl-2,4(1H,3H)-pyrimidinedione; 5-Chloro-3-tert-butyl-6-methyluracil; DPX-D732; Geonter; Herbicide 732; Pyrimidinedione, 5-chloro-3-(1,1-dimethylethyl)-6-methyl-; Sinbar; Sinbar 80W
Formula: C₉H₁₃ClN₂O₂
Molecular Weight: 216.65
Melting Point (°C): 175 - 177
Contaminant Type: Terbacil is an herbicide.

Solubility (in water)

• Solubility: 710 ppm ^g
  Temperature (°C): 25
  

Half-Life (in soil unless otherwise noted)

• t1/2: 120 days ^al
  

• t1/2: 2-5 months ^al
  Environment: aerobically incubated soils
  

• t1/2: 5-7 months ^al
  Environment: in top soil after applying 4.5 kg/hectare
  

• t1/2: 50-180 days ^h
  

Toxicity Effects

• Organism Type: Birds ^h
  Common Name: Quail
  Scientific Name: Phasianidae (Family)
  Toxicity: >2250 mg/kg
  Test: LD50
  

• Organism Type: Crustaceans ^h
  Common Name: Shrimp
  Toxicity: 49 mg/l
  Test: LC50
  

• Organism Type: Crustaceans ^h
  Common Name: Daphnia
  Scientific Name: Daphnia magna
  Toxicity: 65 mg/l
  Test: LC50
  

• Organism Type: Crustaceans ^h
  Common Name: Fiddler crab
  Scientific Name: Uca sp.
  Toxicity: 1000 mg/l
  Test: 48h LC50
  

• Organism Type: Fish ^h
  Common Name: Pumpkinseed
  Scientific Name: Lepomis gibbosus
  Toxicity: 86 mg/l
  Test: 48h LC50
  

• Organism Type: Fish ^h
  Common Name: Bluegill
  Scientific Name: Lepomis macrochirus
  Toxicity: 102.9 mg/l
  Test: 96h LC50
  

• Organism Type: Fish ^h
  Common Name: Rainbow trout
  Scientific Name: Oncorhynchus mykiss
  Toxicity: 46.2 mg/l
  Test: 96h LC50
  

• Organism Type: Mammals ^g
  Common Name: Rat
  Scientific Name: Muridae (Family)
  Toxicity: >5000 - <7500 mg/kg
  Test: LD50
  

• Organism Type: Molluscs ^h
  Common Name: Marine oysters
  Toxicity: >4.9 mg/l
  Test: LC50
  

Soil Organic Carbon/Water Partition Coefficients

• Koc: "41, 51" ^al
  Formulation: measured
  

• Koc: 38 ml/g ^k
  Formulation: Cecil sandy loam
  pH Value: 5.8
  

• Koc: 42 ml/g ^k
  Formulation: Cecil sandy loam
  pH Value: 5.6
  

• Koc: 21 ml/g ^k
  Formulation: Eustis fine sand
  pH Value: 5.6
  

• Koc: 76 ml/g ^k
  Formulation: Glendale sandy clay loam
  pH Value: 7.4
  

• Koc: 140 ml/g ^k
  Formulation: Keyport silt loam
  pH Value: 5.4
  

• Koc: 64 ml/g ^k
  Formulation: Webster silty clay loam
  pH Value: 7.3
  

• Koc: ~1.74 ^k
  Formulation: log
  

Octanol-Water Partition Coefficients

• Log Kow: 1.8921 ^h
  Notes: Source did not specify type of partition coeffecient or if value was the log

• Log Kow: "1.89, 1.90" ^k
  

Work Cited