2,4,5-trichlorophenoxyacetic acid |
![]() Last updated: 04/01/2021 |
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(Also known as: 2,4,5-T; trioxone; 2,4,5-T acid) |
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An obsolete herbicide used as a foliar spray to defoliate broad-leaved plants | |
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Deciduous brush; Total vegetation; Scrub control | |
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Non-crop areas including rough grass pastures, farmyards, ditchbanks, industrial sites, rights of way, roadways; railways | |
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Obsolete | |
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circa 1947 |
UK regulatory status |
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Not approved | ||
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Not applicable | ||
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No UK approval for use |
EC Regulation 1107/2009 (repealing 91/414) |
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Not applicable | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Not applicable | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Also used in |
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Chemical structure |
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C₈H₅Cl₃O₃ | |
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C1=C(C(=CC(=C1Cl)Cl)Cl)OCC(=O)O | |
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No data | |
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SMYMJHWAQXWPDB-UHFFFAOYSA-N | |
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InChI=1S/C8H5Cl3O3/c9-4-1-6(11)7(2-5(4)10)14-3-8(12)13/h1-2H,3H2,(H,12,13) | |
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Yes |
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Common Name | Relationship | Link |
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2,4,5-trichlorophenoxyacetic acid | - | ![]() |
General status |
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Herbicide, Plant growth regulator | |
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Chlorophenoxy acid | |
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Synthetic | |
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Synthetic auxin, readily absorbed by foliage and roots and translocated throughout the plant. | |
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93-76-5 | |
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202-273-3 | |
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082001 | |
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1480 | |
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255.48 | |
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(2,4,5-trichlorophenoxy)acetic acid | |
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2,4,5-trichlorophenoxyacetic acid | |
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Chemical subject to PIC regulations; POP; PAN Dirty Dozen; OSPAR soc; Potential marine pollutant | |
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Not known | |
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Not known | |
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Not applicable | |
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Not applicable | |
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Pale yellow crystalline solid | |
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Formulations |
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Usually formulated as an emulsifiable concentrate or ULV |
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268 | CA3 CA = Medical and toxicological databases and information systems e.g. TOXNET (click here ) 3 = Unverified data of known source |
Moderate | ||||||||
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400 | F3 F = U.S. EPA ECOTOX database / U.S. EPA pesticide fate database / Miscellaneous WHO documents (US EPA Databases Related to Pesticide Risk Assessment ) Heptane3 = Unverified data of known source |
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5000 | F3 F = U.S. EPA ECOTOX database / U.S. EPA pesticide fate database / Miscellaneous WHO documents (US EPA Databases Related to Pesticide Risk Assessment ) Ethanol3 = Unverified data of known source |
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5000 | F3 F = U.S. EPA ECOTOX database / U.S. EPA pesticide fate database / Miscellaneous WHO documents (US EPA Databases Related to Pesticide Risk Assessment ) Methanol3 = Unverified data of known source |
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5000 | F3 F = U.S. EPA ECOTOX database / U.S. EPA pesticide fate database / Miscellaneous WHO documents (US EPA Databases Related to Pesticide Risk Assessment ) Toluene3 = Unverified data of known source |
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156 | Q3 Q = Miscellaneous internet resources 3 = Unverified data of known source |
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Decomposes before boiling | E3 E = Manufacturers safety data sheets 3 = Unverified data of known source |
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1.00 X 1004 | Calculated | - | |||||||
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4.0 | CA3 CA = Medical and toxicological databases and information systems e.g. TOXNET (click here ) Other data Log P=0.60-3.46 (USDA)3 = Unverified data of known source |
High | ||||||||
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1.8 | Q3 Q = Miscellaneous internet resources 3 = Unverified data of known source |
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2.88 | V3 V = ChemID online databases / IPCS INCHEM (ChemID; IPCS INCHEM ) 3 = Unverified data of known source |
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Strong acid | |||||||||||
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0.01 | CA3 CA = Medical and toxicological databases and information systems e.g. TOXNET (click here ) 3 = Unverified data of known source |
Low volatility | ||||||||
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1.2 X 10-06 | F3 F = U.S. EPA ECOTOX database / U.S. EPA pesticide fate database / Miscellaneous WHO documents (US EPA Databases Related to Pesticide Risk Assessment ) 3 = Unverified data of known source |
Non-volatile | ||||||||
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Degradation |
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350 | Q3 Q = Miscellaneous internet resources 3 = Unverified data of known source |
Persistent | |||||||
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350 | Q5 Q = Miscellaneous internet resources 5 = Verified data used for regulatory purposes |
Persistent | ||||||||
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General literature gives DT₅₀ around 48 weeks | ||||||||||
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Soil adsorption and mobility |
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2.48 | F4 F = U.S. EPA ECOTOX database / U.S. EPA pesticide fate database / Miscellaneous WHO documents (US EPA Databases Related to Pesticide Risk Assessment ) 4 = Verified data |
Very mobile | |||||||
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10 | ||||||||||
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USDA database Kd range 0.30-6.20 mL g⁻¹; Kioc range 39-186 mL g⁻¹, n=5; Other data Koc range 39-92,123 mL g⁻¹ | ||||||||||
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Fate indices |
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7.63 | Calculated | High leachability | ||||||||||||||||||||||||||
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1.21 X 1002 | Calculated | - | |||||||||||||||||||||||||
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Medium | Calculated | - | ||||||||||||||||||||||||||
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Very mobile | Calculated | - |
Key metabolites |
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Water | - | - |
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500 | Q3 Q = Miscellaneous internet resources Rat3 = Unverified data of known source |
Moderate | ||||||||
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1.3 | F4 F = U.S. EPA ECOTOX database / U.S. EPA pesticide fate database / Miscellaneous WHO documents (US EPA Databases Related to Pesticide Risk Assessment ) Oncorhynchus mykiss4 = Verified data |
Moderate | ||||||||
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5.0 | F4 F = U.S. EPA ECOTOX database / U.S. EPA pesticide fate database / Miscellaneous WHO documents (US EPA Databases Related to Pesticide Risk Assessment ) Daphnia magna4 = Verified data |
Moderate | ||||||||
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2.0 | F3 F = U.S. EPA ECOTOX database / U.S. EPA pesticide fate database / Miscellaneous WHO documents (US EPA Databases Related to Pesticide Risk Assessment ) Green algae3 = Unverified data of known source |
Moderate | ||||||||
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General |
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High (class III) | - | - | ||||||||
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500 | Q3 Q = Miscellaneous internet resources Rat3 = Unverified data of known source |
Moderate | ||||||||
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The most probable route of exposure is via inhalation and dermal exposure | ||||||||||
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Non-statutory WHO drinking water guideline 0.009 mg l⁻¹ | B5 B = UK CRD and ACP evaluation documents / and other Defra (UK) documents (click here ) UK EA QS database 20185 = Verified data used for regulatory purposes |
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Health issues |
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Toxic by ingestion and inhalation May cause contact dermatitis |
Handling issues |
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No information available | |||
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Xn - Harmful: R22 Xi - Irritant: R36/37/38 N - Dangerous for the environment: R50/53 |
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S24, S60, S61 | |||
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O (Obsolete substance) | |||
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2,4,5-trichlorophenoxyacetic acid | ||
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acide 2,4,5-trichloro phenoxyacetique | ||
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(2,4,5-Trichlor-phenoxy)-essigsaeure | ||
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acido (2,4,5-tricloro-fenossi)-acetico | ||
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kwas 2,4,5-trojchlorofenoksyoctowy | ||
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2,4,5-trichloor-fenoxy)-azijnzuur |
Record last updated: | 04/01/2021 |
Contact: | aeru@herts.ac.uk |
Please cite as: | Lewis, K.A., Tzilivakis, J., Warner, D. and Green, A. (2016) An international database for pesticide risk assessments and management. Human and Ecological Risk Assessment: An International Journal, 22(4), 1050-1064. DOI: 10.1080/10807039.2015.1133242 |