Ecological Assessment of Storm Impacts

Data Collection

Atrazine

Basic Information

Synonym(s): Atrazine; Atrazine 4L; Atrazine 80W; Atrazine (Primatol); Atred; Atrex; Attrex; ATZ; Azinotox 500; Candex; Cekuzina-t; Chromozin; Crisamina; Crisatrina; Crisazine.
Formula: C₈H₁₄ClN₅
Molecular Weight: 215.685
Boiling Point (°C): 200
Melting Point (°C): 175
Pronounciation: Ah-trah-zeen
Contaminant Type: Atrazine is an herbicide.
Additional Information: Atrazine is moderately to highly mobile in soils, especially where soils have low clay or organic matter content. Because it does not absorb strongly to soil particles and it has a lengthy soil half-life, it is expected to have a high potential for groundwater contamination, even though it is only moderately soluble in water. ^m

Solubility (in water)

• Solubility: 33 mg/l ^g
  Temperature (°C): 25
  

• Solubility: 28 mg/l ^k
  Temperature (°C): 20
  

• Solubility: 33 mg/l ^k
  Temperature (°C): 27
  

Half-Life (in soil unless otherwise noted)

• t1/2: 30 days ^ad
  Environment: Estuarine conditions
  

• t1/2: 60 days ^l
  

• t1/2: 60-100+ days ^m
  

Toxicity Effects

• Organism Type: Algae ^e
  Scientific Name: Chlorococcum spp.
  Toxicity: 100 µg/l
  Test: 10d EC50
  Formulation: Technical acid
  

• Organism Type: Algae ^e
  Scientific Name: Dunaliella tertiolecta
  Toxicity: 300 µg/l
  Test: 10d EC50
  Formulation: Technical acid
  

• Organism Type: Algae ^e
  Scientific Name: Isochrysis galbana
  Toxicity: 100 µg/l
  Test: 10d EC50
  Formulation: Technical acid
  

• Organism Type: Algae ^e
  Scientific Name: Microcystis aeruginosa
  Toxicity: 0.003 mg/l
  Test: 8d EC0
  

• Organism Type: Algae ^e
  Scientific Name: Phaeodactylum tricornutum
  Toxicity: 100-200 µg/l
  Test: 10d EC0
  Formulation: Technical acid
  

• Organism Type: Crustaceans ^ae
  Scientific Name: Amphiascus tenuiremis
  Toxicity: 2.5 µg/l
  Test: Chronic Threshold
  

• Organism Type: Crustaceans ^ce
  Scientific Name: Ceriodaphnia dubia
  Toxicity: >30 mg/l
  Test: 48h LC50
  Notes: LC50 value greater than highest concentration tested (= approximate aqueous solubility)

• Organism Type: Crustaceans ^be
  Common Name: Daphnia
  Scientific Name: Daphnia magna
  Toxicity: >39000 µg/l
  Test: 48h EC50, immobilization
  

• Organism Type: Crustaceans ^v
  Common Name: Mysid shrimp
  Scientific Name: Mysidopsis bahia
  Toxicity: 80 µg/l
  Test: NOAEC
  

• Organism Type: Fish ^bf
  Common Name: Bluegill
  Scientific Name: Lepomis macrochirus
  Toxicity: 5.4-8.4 mg/l
  Test: Incipiant LC50
  Temperature (°C): 28 +/- 1
  

• Organism Type: Fish ^bf
  Common Name: Bluegill
  Scientific Name: Lepomis macrochirus
  Toxicity: >0.10, <0.50 mg/l
  Test: MATC
  Temperature (°C): 28 +/- 1
  

• Organism Type: Fish ^bf
  Common Name: Fathead minnow
  Scientific Name: Pimephales promelas
  Toxicity: 11-20 mg/l
  Test: Incipiant LC50
  Temperature (°C): 25 +/- 1
  

• Organism Type: Fish ^bf
  Common Name: Fathead minnow
  Scientific Name: Pimephales promelas
  Toxicity: >0.21, <0.52 mg/l
  Test: MATC
  Temperature (°C): 25 +/- 1
  

• Organism Type: Fish ^bf
  Common Name: Brook trout
  Scientific Name: Salvelinus fontinalis
  Toxicity: 4.0-6.0 mg/l
  Test: Incipiant LC50
  Temperature (°C): 9-16
  

• Organism Type: Fish ^bf
  Common Name: Brook trout
  Scientific Name: Salvelinus fontinalis
  Toxicity: >0.06, <0.12 mg/l
  Test: MATC
  Temperature (°C): 9-16
  

• Organism Type: Mammals ^m
  Common Name: Rat
  Scientific Name: Muridae (Family)
  Toxicity: 672-3000 mg/kg
  Test: LD50
  

• Organism Type: Mammals ^g
  Common Name: Rat
  Scientific Name: Muridae (Family)
  Toxicity: 1600-3800 mg/kg
  Test: LD50
  Formulation: a mixture
  

• Organism Type: Mammals ^g
  Common Name: Rat
  Scientific Name: Muridae (Family)
  Toxicity: 1780 mg/kg
  Test: LD50
  

Soil Organic Carbon/Water Partition Coefficients

• Koc: 54 m3/Mg ^bg
  Notes: Average - using the mass balance

• Koc: Log 1.95 - 2.71 ^k
  

• Koc: 100 ml/g ^m
  

• Koc: 100 ml/g ^l
  

• Koc: 45 - 63 ^e
  

Octanol-Water Partition Coefficients

• Log Kow: 2.33 - 2.8 ^k
  

• Log Kow: 2.64; 2.23; 2.35; 2.4; 2.61; 2.63; 2.68 ^e
  

Work Cited