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atrazine (Ref: G 30027)
** aneldazin ** Translations

Environmental Fate - Ecotoxicology - Human Health - A to Z Index - Home

for atrazine

Description: A triazine herbicide used pre- and post-emergence with restricted permitted uses to control broad-leaved weeds and grasses

Introduction: 1957

EC Regulation 1107/2009 (repealing 91/414):
Status Not approved
Dossier rapporteur/co-rapporteur UK
Date inclusion expires Expired

Approved for use () or known to be used () in the following European countries:




























Also registered in: Australia, USA

General status:
Pesticide type Herbicide
Substance group Triazine
Substance origin Synthetic
Mode of action Selective, systemic action with residual and foliar activity. Inhibits photosynthesis (photosystem II).
CAS RN 1912-24-9
EC number 217-617-8
CIPAC number 91
US EPA chemical code 080803
Chiral molecule No
Chemical formula C8H14ClN5
SMILES Clc1nc(nc(n1)NC(C)C)NCC
International Chemical Identifier (InChI) InChI=1/C8H14ClN5/c1-4-10-7-12-6(9)13-8(14-7)11-5(2)3/h5H,4H2,1-3H3,(H2,10,11,12,13,14)
Structure diagram/image available? Yes
Molecular mass (g mol-1) 215.68
PIN (Preferred Identification Name) 6-chloro-N2-ethyl-N4-(propan-2-yl)-1,3,5-triazine-2,4-diamine
IUPAC name 6-chloro-N2-ethyl-N4-isopropyl-1,3,5-triazine-2,4-diamine
CAS name 6-chloro-N-ethyl-N'-(1-methylethyl)-1,3,5-triazine-2,4-diamine
Other status information OSPAR soc; WFD pps; Potential groundwater contaminant
Herbicide Resistance Classification (HRAC) C1
Insecticide Resistance Classification (IRAC) Not applicable
Fungicide Resistance Classification (FRAC) Not applicable
Physical state White crystals
Related substances & organisms

Property Value
Example manufacturers of products using this active
  • Syngenta
  • Bayer CropScience
  • Monsanto
  • Scotts
Example products using this active
  • Gesaprim
  • Fenamin
  • Atrazinax
  • Weedex
  • Primaze
  • Atratol
  • Radazine
UK LERAP status LERAP Category B
Formulation and application details Available in a variety of formulations including dry flowable, flowable liquid, liquid, water dispersible granules and wettable powders.


for atrazine

Property Value Source/Quality Score/Other Information Interpretation
Solubility - In water at 20oC (mg l-1) 35 B5 Low
Solubility - In organic solvents at 20oC (mg l-1) 24000 F4 - Ethyl acetate -
28000 F4 - Dichloromethane -
4000 F4 - Toluene -
110 F4 - n-Hexane -
Melting point (oC) 175.8 L3 -
Boiling point (oC) Decomposes before boiling F4 -
Degradation point (oC) - - -
Flashpoint (oC) Not expected to self ignite; Not highly flammable F4 -
Octanol-water partition coefficient at pH 7, 20oC P 5.01 X 1002 Calculated -
Log P 2.7 B5 Moderate
Bulk density (g ml-1)/Specific gravity 1.23 F4 -
Dissociation constant (pKa) at 25oC 1.7 B5 -
Note: Very weak base
Vapour pressure at 25oC (mPa) 0.039 B5 Non-volatile
Henry's law constant at 25oC (Pa m3 mol-1) 1.50 X 10-04 L3 Non-volatile
Henry's law constant at 20oC (dimensionless) 1.20 X 10-07 K3 Non-volatile
GUS leaching potential index 3.30 Calculated High leachability
SCI-GROW groundwater index (μg l-1) for a 1 kg ha-1 or 1 l ha-1 application rate Value 4.09 X 10-01 Calculated -
Note -
Potential for particle bound transport index - Calculated Medium
Maximum UV-vis absorption L mol-1 cm-1 - - -
Surface tension (mN m-1) - - -

Property Value Source/Quality Score/Other Information Interpretation
Soil degradation (days) (aerobic) DT50 (typical) 75 B5 Laboratory Moderately persistent
DT50 (lab at 20oC) 66 B4 Moderately persistent
DT50 (field) 29 B4 Non-persistent
DT90 (lab at 20oC) - - -
DT90 (field) - - -
Note Lab studies DT50 range 28-150 days, field studies DT50 range 6-108 days (USA); Other sources: DT50 6-10 weeks (R3), 146 days at 25 DegC (R3)
Aqueous photolysis DT50 (days) at pH 7 Value 2.6 B5 Moderately fast
Note -
Aqueous hydrolysis DT50 (days) at 20oC and pH 7 Value 86 K4 Moderately persistent
Note Rapidly hydrolysed in strong acids and alkalis and at elevated temperatures
Water-sediment DT50 (days) 80 K4 Moderately fast
Water phase only DT50 (days) - - -

Soil adsorption and mobility:
Property Value Source/Quality Score/Other Information Interpretation
Linear Kd - G3 Moderately mobile
Koc 100
Notes and range Other sources: 89-513 mL/g (R3), Log Koc 2.00 at 25 DegC (R4)
Freundlich Kf 3.2 R4 Moderately mobile
Kfoc 174
1/n 1.07
Notes and range Literature data: Kf range 1.3-6.3 mL/g, kfoc range 70-429 mL/g, 1/n range 1.04=1.10, Soils = 13
pH sensitivity -

Key metabolites:
Metabolite Formation medium Estimated maximum occurrence fraction 91/414 relevancy
6-deisopropyl atrazine (Ref: G-28279) Soil   0.33   Major, Relevant
deethylatrazine (Ref: G-30033) Soil   0.21   Major, Relevant
2-hydroxyatrazine (Ref: G-34048) Soil     Non Relevant

Other known metabolites:
Metabolite name and reference Aliases Formation medium / Rate Estimated maximum occurrence fraction Metabolising enzymes
(Ref: G-17791)
- Soil 0.004 -
(Ref: G-17792)
- Soil 0.08 -
(Ref: G-17794)
- Soil 0.08 -
(Ref: G-28273)
- Soil 0.08 -


for atrazine

Property Value Source/Quality Score/Other Information Interpretation
Bio-concentration factor BCF 4.3 P4 (Other literature Log BCF range 0.98-2.5 (R3)) Low potential
CT50 (days) Not available -
Bioaccumulation potential - Calculated Low
Mammals - Acute oral LD50 (mg kg-1) 1869 B5 Rat Moderate
Mammals - Short term dietary NOEL (mg kg-1) - B3 Rat -
(ppm diet) 200 -
Birds - Acute LD50 (mg kg-1) 4237 B5 Coturnix japonica Low
Birds - Short term dietary (LC50/LD50) - - -
Fish - Acute 96 hour LC50 (mg l-1) 4.5 B5 Oncorhynchus mykiss Moderate
Fish - Chronic 21 day NOEC (mg l-1) 2 J4 Oncorhynchus mykiss -
Aquatic invertebrates - Acute 48 hour EC50 (mg l-1) 85 B3 Daphnia magna Moderate
Aquatic invertebrates - Chronic 21 day NOEC (mg l-1) 0.25 F3 Daphnia magna, LOEC -
Aquatic crustaceans - Acute 96 hour LC50 (mg l-1) 1.0 F4 Americamysis bahia Moderate
Sediment dwelling organisms - Acute 96 hour LC50 (mg l-1) 1.0 F3 Chironomus riparius, 1 day Moderate
Sediment dwelling organisms - Chronic 28 day NOEC, static, water (mg l-1) - - -
Sediment dwelling organisms - Chronic 28 day NOEC, sediment (mg kg-1) - - -
Aquatic plants - Acute 7 day EC50, biomass (mg l-1) 0.019 F3 Lemna gibba Moderate
Algae - Acute 72 hour EC50, growth (mg l-1) 0.059 B3 Raphidocelis subcapitata Moderate
Algae - Chronic 96 hour NOEC, growth (mg l-1) 0.1 F3 Green algae Moderate
Honeybees - Acute 48 hour LD50 (μg bee-1) 100 B5 Oral Moderate
Earthworms - Acute 14 day LC50 (mg kg-1) 79 B5 Moderate
Earthworms - Chronic 14 day NOEC, reproduction (mg kg-1) - - -
Other soil macro-organisms - e.g. Collembola LR50 / EC50 / NOEC / % Effect - - -
Other arthropod (1) LR50 g ha-1 - - -
% Effect Harmless AA2 Typhlodromus pyri Harmless
Other arthropod (2) LR50 g ha-1 - - -
% Effect Harmless AA2 Chrysoperla carnea Harmless
Soil micro-organisms - - -
Mesocosm study data NOEAEC mg l-1 - - -
NOEAEC mg l-1 - - -


for atrazine

Property Value Source/Quality Score/Other Information Interpretation
Mammals - Acute oral LD50 (mg kg-1) 1869 B5 Rat Moderate
Mammals - Dermal LD50 (mg kg-1 body weight) > 3100 L3 Rat -
Mammals - Inhalation LC50 (mg l-1) 5.8 L3 Rat -
Other Mammal toxicity endpoints - -
ADI - Acceptable Daily Intake (mg kg-1bw day-1) 0.02 JMPR 2007 -
ARfD - Acute Reference Dose (mg kg-1bw day-1) 0.1 JMPR 2007 -
AOEL - Acceptable Operator Exposure Level - Systemic (mg kg-1bw day-1) 0.01 BA5; EU 1998 -
Dermal penetration studies (%) 10 BA5; EU 1998 -
Dangerous Substances Directive 76/464 - - -
Exposure Limits - - -
Exposure Routes Public -
Occupational May be absorbed from the lungs or through intact skin
Examples of European MRLs (mg kg-1) Value Vegetables and fruit: 0.05: Cereal grains: 0.1
Note Current May 2007.
For the EU pesticides database click here
Drinking Water MAC (μg l-1) - - -

Health issues:
Carcinogen Mutagen Endocrine disrupter Reproduction / development effects Acetyl cholinesterase inhibitor Neurotoxicant Respiratory tract irritant Skin irritant Eye irritant

General human health issues May cause coma, circulatory collapse and gastric bleeding
May cause renal failure

: Yes, known to cause a problem
: No, known not to cause a problem
: Possibly, status not identified
- : No data

Handling issues:
Property Value Source/Quality Score/Other Information Interpretation
General Avoid the formation of dust
Powders may become explosive under certain conditions
CLP classification 2013 -
EC Risk Classification Xn - Harmful: R48/22, R43
N - Dangerous for the environment: R50, R53
EC Safety Classification S2, S36/37, S61, S60
WHO Classification III - Slightly hazardous
US EPA Classification (formulation) III - Caution - Slightly toxic
UN Number -
Waste disposal & packaging -


for atrazine

Language Name
English atrazine
French atrazine
German Atrazin
Danish atrazin
Italian atrazina
Spanish atrazina
Greek atrazine
Slovenian atrazin
Polish atrazyna
Swedish -
Hungarian atrazine
Dutch atrazine

Record last updated: Saturday 28 June 2014