Ecological Assessment of Storm Impacts

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Endothall

CAS Number: 145-73-3

Basic Information

The chemical structure of Endothall Synonym(s): 7-oxabicyclo[2.2.1]heptane-2,3-Dicarboxylic acid; Aquathol; Aquathol G; Endo-3,5-epoxy-1,2-cyclohexanedicarboxylic acid; Endothal; Endothall; Endothall ; Endoxohexahydrophthalic acid; Herbicide; Hydrothal; Hydrothol
Formula: C8H10O5
 Molecular Weight: 186.164
 Boiling Point (°C): 200
 Melting Point (°C): 144
 Contaminant Type: Endothall is a contaminant with other or multiple types of use.

Solubility (in water)

  • Solubility: 100 g/l e
    Temperature (°C): 20
  • Solubility: 100 g/kg h
    Temperature (°C): 20

Half-Life (in soil unless otherwise noted)

  • t1/2: 4-5 days al
    Environment: clay soils
  • t1/2: 9 days al
    Environment: soils with high organic content

Toxicity Effects

  • Organism Type: Crustaceans e
    Scientific Name: Gammarus lacustris
     Toxicity: 100 mg/l
     Test: 96h NOEC
     Formulation: dipotassium salt
  • Organism Type: Fish e
    Common Name: Bluegill
     Scientific Name: Lepomis macrochirus
     Toxicity: 160 mg/l
     Test: 96h LC50
    Formulation: dipotassium salt
  • Organism Type: Fish e
    Common Name: Largemouth bass
     Scientific Name: Micropterus salmoides
     Toxicity: 200 mg/l
     Test: 96h LC50
    Formulation: disodium salt
  • Organism Type: Fish e
    Common Name: Largemouth bass
     Scientific Name: Micropterus salmoides
     Toxicity: 200 mg/l
     Test: 96h LC50
    Formulation: disodium salt
  • Organism Type: Fish e
    Common Name: Largemouth bass
     Scientific Name: Micropterus salmoides
     Toxicity: 120 mg/l
     Test: 96h LC50
    Formulation: disodium salt
  • Organism Type: Fish e
    Common Name: Redfin Shiner
     Scientific Name: Notropis umbratilus
     Toxicity: 95 mg/l
     Test: 96h LC50
    Formulation: disodium salt
  • Organism Type: Fish e
    Common Name: Chinook salmon or king salmon
     Scientific Name: Oncorhynchus tshawytscha
     Toxicity: 136 mg/l
     Test: 96h LC50
    Formulation: disodium salt
  • Organism Type: Fish e
    Common Name: Bluntnose minnow
     Scientific Name: Pimephales notatus
     Toxicity: 110 mg/l
     Test: 96h LC50
    Formulation: disodium salt
  • Organism Type: Fish e
    Common Name: Fathead minnow
     Scientific Name: Pimephales promelas
     Toxicity: 320 mg/l
     Test: 96h LC50
    Formulation: dipotassium salt
  • Organism Type: Mammals h
    Common Name: Guinea pig
     Toxicity: 250 mg/kg
     Test: LD50
     Formulation: disodium endothall
  • Organism Type: Mammals e
    Common Name: Rat
     Scientific Name: Muridae (Family)
     Life Stage: 0.6 g
     Toxicity: 35-51 mg/kg bw
     Test: LD50
  • Organism Type: Mammals h
    Common Name: Rat
     Scientific Name: Muridae (Family)
     Toxicity: 38 mg/kg
     Test: LD50
     Formulation: technical endothall
  • Organism Type: Mammals g
    Common Name: Rat
     Scientific Name: Muridae (Family)
     Toxicity: 51 mg/kg
     Test: LD50
  • Organism Type: Mammals g
    Common Name: Rat
     Scientific Name: Muridae (Family)
     Toxicity: 51 mg/kg
     Test: LD50
  • Organism Type: Mammals h
    Common Name: Rat
     Scientific Name: Muridae (Family)
     Toxicity: 51 mg/kg
     Test: LD50
     Formulation: disodium endothall

Octanol-Water Partition Coefficients

  • Log Kow: 1.91 ak

Work Cited

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.
h Extension Toxicology Network. Pages retrieved November, 2003 from http://ace.orst.edu/info/extoxnet/. Oregon State University, Corvallis, OR.
ak Verschueren, K. 2001. Handbook of Environmental Data on Organic Chemicals, 4th edition. John Wiley & Sons, Inc., New York.
al Speclab.com. 2003. Spectrum chemcial fact sheet. Pages retrieved April 2005 from http://www.speclab.com/compound/. Spectrum Laboratory Inc, Ft. Lauderdale, FL and Savannah, GA.