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GET ADDITIONAL DATA HERE!
PhD Oportunity with Syngenta & the University of Hertfordshire

triclopyr
** Translations

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

GENERAL INFORMATION Click here for an explantaion of the general chemical status information
for triclopyr

Description: A herbicide for perennial broad-leaved and woody weed control mainly on uncultivated areas

Example pests controlled: Alder; Blackberry; Boxelder; Buckthorn; Cottonwood; Gorse; Hawthorn; Mulberry; Sassafras; Wild rose; Burdock; Curly dock; Canada thistle; Mustard; Lambsquarter

Example applications: Uncultivated areas; Grassland; Plantations; Rangeland; Right-of-way; Industrial sites; Ornamental turf; Rice

Efficacy & activity: -

Availability status: Current

Introduction & key dates: 1979

EC Regulation 1107/2009 (repealing 91/414):
Status Approved
Dossier rapporteur/co-rapporteur Ireland
Date inclusion expires 30/04/2018

Approved for use () or known to be used () in the following European countries: Click to access a note on the approvals information on this site

AT

BE

BG

CY

CZ

DE

DK

EE

EL

ES

FI

FR

HR

HU

IE

IT

LT

LU

LV

MT

NL

PL

PT

RO

SE

SI

SK

UK

Also used in: Australia, USA

General status: Click here for further information on the general chemical status information used on this site
Pesticide type Herbicide
Substance group Pyridine compound
Minimum active substance purity 960g/kg as butoxyethyl ester
Known relevant impurities EU dossier - None declared
Substance origin Synthetic
Mode of action Selective, systemic, absorbed through roots and foliage. Synthetic auxin.
CAS RN 55335-06-3
EC number 259-597-3
CIPAC number 376
US EPA chemical code 116001
Chiral molecule No
Chemical formula C7H4Cl3NO3
SMILES ClC1=C(OCC(O)=O)N=C(Cl)C(Cl)=C1
International Chemical Identifier key (InChIKey) REEQLXCGVXDJSQ-UHFFFAOYSA-N
International Chemical Identifier (InChI) InChI=1S/C7H4Cl3NO3/c8-3-1-4(9)7(11-6(3)10)14-2-5(12)13/h1H,2H2,(H,12,13)
Structure diagram/image available? Yes
Molecular mass (g mol-1) 256.5
PIN (Preferred Identification Name) [(3,5,6-trichloropyridin-2-yl)oxy]acetic acid
IUPAC name 3,5,6-trichloro-2-pyridyloxyacetic acid
CAS name ((3,5,6-trichloro-2-pyridinyl)oxy)acetic acid
Other status information Potential groundwater pollutant
Herbicide Resistance Classification (HRAC) O
Herbicide Resistance Classification (WSSA) 4
Insecticide Resistance Classification (IRAC) Not applicable
Fungicide Resistance Classification (FRAC) Not applicable
Examples of recorded resistance -
Physical state White solid
Related substances & organisms

Formulations:
Property Click here for information on the general product and branding information used on this site Value
Example manufacturers & suppliers of products using this active now or historically
  • AgriGuard
  • Dow AgroSciences
  • Headland
  • Nomix Environ
  • Nufarm UK
  • Scotts
Example products using this active
  • Blastor T
  • Doxstar
  • Grazon 90
  • Garlon 4
UK LERAP status Buffer probably required in UK - see product label
Formulation and application details Usually formulated as an emulsifiable concentrate.


ENVIRONMENTAL FATE

for triclopyr

Property Click here for information on the parameters used to describe environmental fate on this site Value Source/Quality Score/Other Information Click here for information on the primary data sources used to populate this database with fate data Interpretation Click here for information on the way in which we interpret environmental fate data
Solubility - In water at 20oC (mg l-1) 8100 A5 High
Solubility - In organic solvents at 20oC (mg l-1) 90 A5 - Hexane -
19000 A5 - Toluene -
665000 A5 - Methanol -
582000 A5 - Acetone -
Melting point (oC) 150 A5 -
Boiling point (oC) Decomposes before boiling A5 -
Degradation point (oC) 208 A5 -
Flashpoint (oC) Not expected to self ignite; Not highly flammable A5 -
Octanol-water partition coefficient at pH 7, 20oC P 4.17 X 1004 Calculated -
Log P 4.62 A5 High
Bulk density (g ml-1)/Specific gravity 1.3 A5 -
Dissociation constant (pKa) at 25oC 3.97 L3 -
Note: Weak acid
Vapour pressure at 25oC (mPa) 0.1 A5 Low volatility
Henry's law constant at 25oC (Pa m3 mol-1) 2.90 X 10-03 A5 Non-volatile
GUS leaching potential index Click here for a note on the limitations of the GUS index 3.69 Calculated High leachability
SCI-GROW groundwater index (μg l-1) for a 1 kg ha-1 or 1 l ha-1 application rate Click here for a note on the limitations of the SCI-GROW index Value 6.85 X 10-01 Calculated -
Note -
Potential for particle bound transport index Click here for a note on the limitations of the potential for particle bound transport index - Calculated Low
Maximum UV-vis absorption L mol-1 cm-1 - - -
Surface tension (mN m-1) 71.6 A5 at 21oC, 99.4% -

Degradation:
Property Click here for information on the parameters used to describe substance degradation Value Source/Quality Score/Other Information Click here for information on the primary data sources used to populate this database with degradation data Interpretation Click here for information on the way in which we interpret substance degradation data
General biodegradability -
Soil degradation (days) (aerobic) DT50 (typical) 39 A5 Moderately persistent
DT50 (lab at 20oC) 39 A5 Moderately persistent
DT50 (field) 30 A5 Moderately persistent
DT90 (lab at 20oC) 105 A5 -
DT90 (field) 153.9 A5 -
DT50 modelling endpoint - - -
Note EU dossier lab studies DT50 range 13-52 days, DT90 range 44-171 days; field studies DT50 range 6.9-53.9 days
Dissipation rate RL50 on plant matrix Value - - -
Note -
Dissipation rate RL50 on and in plant matrix Value 10.9 R4 -
Note Published literature RL50 range 4.0-17.8 days, 2 field grown crops, leaves, n=2
Aqueous photolysis DT50 (days) at pH 7 Value 0.1 A5 Fast
Note -
Aqueous hydrolysis DT50 (days) at 20oC and pH 7 Value 8.7 A5 Non-persistent
Note pH and temperature sensitive: DT50 84 days at pH 5 and 25 degC, 26 days at pH 5 and 35 degC, 8.7 days at pH 7 and 25 degC, 2.3 days at pH 7 and 35 degC, 0.3 days at pH 9 and 25 degC, 0.06 days at pH 9 and 35 degC
Water-sediment DT50 (days) 29.2 A5 Fast
Water phase only DT50 (days) 24.8 A5 Slow

Soil adsorption and mobility:
Property Click here for information on the parameters used to describe substance adsorption and mobility Value Source/Quality Score/Other Information Click here for information on the primary data sources used to populate this database with adsorption and mobility data Interpretation Click here for information on the way in which we interpret substance adsorption and mobility
Linear Kd - DW4 Mobile
Koc 27
Notes and range -
Freundlich Kf 2.36 A5 Mobile
Kfoc 48
1/n 0.81
Notes and range EU dossier kf range 0.683-6.40, Kfoc range 40.6-59.3 mL/g, 1/n range 0.75-0.89, Soils=5; Literature mean: Kf = 5.2 mL/g, Kfoc = 56.7 mL/g, 1/n = 0.898, Soils = 7
pH sensitivity No

Key metabolites:
Metabolite Formation medium Estimated maximum occurrence fraction 1107/2009 relevancy Click here for further information on 1107/2009 relevancy
3,5,6-trichloro-2-pyridinol This metabolite may cause environmental pollution, click here for further information Soil   0.331   Major fraction; Relevant

Other known metabolites:
Metabolite name and reference Aliases Formation medium / Rate Estimated maximum occurrence fraction Metabolising enzymes
3,6-dichloro-2-pyridinol - Water/sediment - -
6-chloro-2-pyridinol - Water/sediment - -
3,5,6-trichloro-2-methoxypyridine - Plant - -


ECOTOXICOLOGY

for triclopyr

Property Click here for information on the parameters used to describe substance ecotoxicology Value Source/Quality Score/Other Information Click here for information on the primary data sources used to populate this database with ecotoxicology data Interpretation Click here for information on the way in which we interpret substance ecotoxicology
Bio-concentration factor BCF (l kg-1) 0.77 A5 (Other literature Log BCF range -0.3-0.04 (R3)) Low potential
CT50 (days) 14 -
Mammals - Acute oral LD50 (mg kg-1) 630 A5 Rat Moderate
Mammals - Short term dietary NOEL (mg kg-1) 3 L2 Rat, 2 year High
(ppm diet) - -
Birds - Acute LD50 (mg kg-1) 1698 A5 Anas platyrhynchos Moderate
Birds - Short term dietary (LC50/LD50) > 5620 mg kg feed-1 A5 Anas platyrhynchos -
Fish - Acute 96 hour LC50 (mg l-1) 117 A5 Oncorhynchus mykiss Low
Fish - Chronic 21 day NOEC (mg l-1) 46.3 A4 Unknown species Low
Aquatic invertebrates - Acute 48 hour EC50 (mg l-1) > 131 A5 Daphnia magna Low
Aquatic invertebrates - Chronic 21 day NOEC (mg l-1) 48.5 A4 Unknown species Low
Aquatic crustaceans - Acute 96 hour LC50 (mg l-1) - - -
Sediment dwelling organisms - Acute 96 hour LC50 (mg l-1) - - -
Sediment dwelling organisms - Chronic 28 day NOEC, static, water (mg l-1) 23.0 A5 Chironomus riparius Low
Sediment dwelling organisms - Chronic 28 day NOEC, sediment (mg kg-1) - - -
Aquatic plants - Acute 7 day EC50, biomass (mg l-1) 0.8 F4 Lemna gibba Moderate
Non-target plants - - -
- - -
Algae - Acute 72 hour EC50, growth (mg l-1) 75.8 A5 Raphidocelis subcapitata Low
Algae - Chronic 96 hour NOEC, growth (mg l-1) 8 Q2 Unknown species Low
Honeybees Contact acute 48 hour LD50 (μg bee-1) > 100 A5 Low
Oral acute 48 hour LD50 (μg bee-1) - - -
Unknown mode acute 48 hour LD50 (μg bee-1) - - -
Earthworms - Acute 14 day LC50 (mg kg-1) > 521 A5 Eisenia foetida, corr 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 - - -
Other arthropod (2) LR50 g ha-1 - - -
% Effect - - -
Soil micro-organisms - - -
Mesocosm study data NOEAEC mg l-1 - - -
NOEAEC mg l-1 - - -


HUMAN HEALTH AND PROTECTION

for triclopyr

General:
Property Click here for information on the parameters used to describe human health and protection issues Value Source/Quality Score/Other Information Click here for information on the primary data sources used to populate this database with human health and protection data Interpretation Click here for information on the way in which we interpret human health and protection data
Threshold of Toxicological Concern (Cramer Class) Click here for a note on the limitations of the Cramer class High (class III) - -
Mammals - Acute oral LD50 (mg kg-1) 630 A5 Rat Moderate
Mammals - Dermal LD50 (mg kg-1 body weight) > 2000 A5 Rat -
Mammals - Inhalation LC50 (mg l-1) > 4.8 A5 Rat -
Other Mammal toxicity endpoints - -
ADI - Acceptable Daily Intake (mg kg-1bw day-1) 0.03 A5 Rat, SF=100 -
ARfD - Acute Reference Dose (mg kg-1bw day-1) 0.3 A5 Rabbit, SF=100 -
AOEL - Acceptable Operator Exposure Level - Systemic (mg kg-1bw day-1) 0.05 A5 Rat, SF=100 -
Dermal penetration studies (%) 10-18 A5 concentration dependent -
Dangerous Substances Directive 76/464 - - -
Exposure Limits - - -
Exposure Routes Public No unacceptable risks to bystanders identified
Occupational Risk to operators but acceptable under label recommendations for use for personal protection clothing and equipment
European MRLs Click here for the EU MRL pesticide database
Drinking Water MAC (μg l-1) - - -

Health issues:
Carcinogen Mutagen Endocrine disrupter Reproduction / development effects Cholinesterase inhibitor Neurotoxicant

-

-

Respiratory tract irritant Skin irritant Skin sensitiser Eye irritant Phototoxicant

-

-

General human health issues Highly toxic
Heart, kidney and liver toxicant

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

Handling issues:
Property Click here for information on the parameters used to describe substance handling issues Value Source/Quality Score/Other Information Click here for information on the primary data sources used to populate this database with data on handling issues Interpretation Click here for information on the way in which we interpret data on handling issues
General Click here for a description of the International Maritime Dangerous Goods (IMDG) codes Not explosive
IMDG Transport Code is usually 9
CLP classification 2013 None allocated at this time
EC Risk Classification Click here to view information omn the EU risk phrases Reproduction risk category 3: R63
Xn - Harmful: R22, R43
Xi - Irritant: R36
N - Dangerous for the environment: R52
EC Safety Classification Click here to view information omn the EU safety phrases -
WHO Classification II - Moderately hazardous
US EPA Classification (formulation) III - Caution - Slightly toxic
UN Number Usually 3082
Waste disposal & packaging Click here for a description of UN packaging marks Packaging Group III (minor danger)


TRANSLATIONS

for triclopyr

Language Name
English triclopyr
French triclopyr
German Triclopyr
Danish triclopyr
Italian triclopir
Spanish triclopir
Greek -
Slovenian triklopir
Polish trichlopyr
Swedish -
Hungarian triklopyr
Dutch -

Record last updated: Monday 07 August 2017
Contact: aeru@herts.ac.uk