Ecological Assessment of Storm Impacts

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Data Collection

Glyphosate

CAS Number: 1071-83-6

Basic Information

The chemical structure of Glyphosate Synonym(s): Bronco; (carboxymethylamino)methylphosphonic acid; Glialka; Glyphosphate; Phosphonomethylaminoacetic acid; Pondmaster; Ranger; Rattler 4AS; Roundup 2.5
Formula: C3H8NO5P
 Molecular Weight: 169.074
 Contaminant Type: Glyphosate is an herbicide.
Notes: White powder
 Additional Information: Glyphosate is practically non-toxic to fish. However, Roundup was more toxic to fish than was glyphosate. An additive used in the Roundup formulation (modified tallow amine used as a surfactant) is apparently more toxic to fish than many common surfactants. For this reason, the formulation for use in aquatic situations (Rodeo) omits this ingredient. The surfactant is used to allow the compound to readily dissolve in solution and to keep the compound from balling up on the leaf surface. m

Solubility (in water)

  • Solubility: 900,000 mg/l m
  • Solubility: 10,000 mg/l e
    Temperature (°C): 25
  • Solubility: 1.2 g/100ml d

Half-Life (in soil unless otherwise noted)

  • t1/2: 174 days a
  • t1/2: 2-174 days l

Toxicity Effects

  • Organism Type: Algae e
    Common Name: Green algae
     Scientific Name: Selenastrum capricornutum
     Toxicity: 0.0038 mg/l
     Test: EC50 growth
     Notes: In algal assay medium
  • Organism Type: Algae e
    Common Name: Green algae
     Scientific Name: Selenastrum capricornutum
     Toxicity: <25, <100 mg/l
     Test: EC50, N fixation
     Notes: In algal assay medium
  • Organism Type: Algae e
    Common Name: Green algae
     Scientific Name: Selenastrum capricornutum
     Toxicity: 0.01 mg/l
     Test: EC50, O2 evolution
     Notes: In algal assay medium
  • Organism Type: Algae e
    Common Name: Green algae
     Scientific Name: Selenastrum capricornutum
     Toxicity: 35, 44, 70 mg/l
     Test: EC50, photosynthesis
     Notes: In algal assay medium
  • Organism Type: Fish m
    Common Name: Bluegill
     Scientific Name: Lepomis macrochirus
     Toxicity: 120 mg/l
     Test: LC50
  • Organism Type: Fish m
    Common Name: Rainbow trout
     Scientific Name: Oncorhynchus mykiss
    Toxicity: 38 mg/l
     Test: 96h LC50
  • Organism Type: Mammals m
    Common Name: Rat
     Scientific Name: Muridae (Family)
     Toxicity: 5600 mg/kg
     Test: LD50
  • Organism Type: Mammals g
    Common Name: Rat
     Scientific Name: Muridae (Family)
     Toxicity: >5000 mg/kg
     Test: LD50

Soil Organic Carbon/Water Partition Coefficients

  • Koc: Log Koc: 3.43-3.69 k

Octanol-Water Partition Coefficients

  • Log Kow: -1.6 l
  • Log Kow: -1.6 k
  • Log Kow: 0.001-0.002 e
    Formulation: measured

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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.
d ChemFinder. Cambridge MA: CambridgeSoft Corporation. Retrieved November, 2003 from http://chemfinder.cambridgesoft.com
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.
k Montgomery, J. H. 1993. Agrochemicals Desk Reference: Environmental Data. Lewis Publishers, Boca Raton, FL.
l The ARS Pesticide Properties Database. Pages retrieved November, 2003 from http://www.arsusda.gov/acsl/ppdb.html. USDA, ARS, Alternate Crops & Systems Lab, Beltsville, MD.
m The University of Manchester Compound Database. Pages retrieved November 2003 from http://www.man.ac.uk/umec/extra/list.html. The University of Manchester, Manchester, England.