Chlorfenac |
![]() Last updated: 04/01/2021 |
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(Also known as: fenac; trifene) |
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An obsolete herbicide used to control annual weeds and grasses in sugarcane and non-cropped areas | |
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Dandelion; Nightshade; Docks; Plaintains; Foxtail; Purslane; Thistles; Nettles; Crabgrass | |
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Sugarcane; Non-cropped areas such as rights-of-way, rangeland; Submerged aquatic weeds | |
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Obsolete | |
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Early 1960s, developed |
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 approved | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Not applicable | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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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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C₈H₅Cl₃O₂ | |
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C1=CC(=C(C(=C1Cl)CC(=O)O)Cl)Cl | |
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No data | |
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QZXCCPZJCKEPSA-UHFFFAOYSA-N | |
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InChI=1S/C8H5Cl3O2/c9-5-1-2-6(10)8(11)4(5)3-7(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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chlorfenac | - | ![]() |
General status |
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Herbicide | |
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Aromatic carboxylic acid | |
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Synthetic | |
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Inhibits cell wall synthesis, Systemic, absorbed predominately by plant roots, with translocation. Auxin mimic. | |
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85-34-7 | |
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201-599-3 | |
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None allocated | |
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082601 | |
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6805 | |
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239.48 | |
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(2,3,6-trichlorophenyl)acetic acid | |
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(2,3,6-trichlorophenyl)acetic acid | |
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2,3,6-trichlorobenzeneacetic acid | |
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O | |
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4 | |
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Not applicable | |
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Not applicable | |
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Colourless solid |
Formulations |
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Usually supplied as granules or as an aqueous solution |
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6.14 | 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 |
Low | ||||||||
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156 | L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source |
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Decomposes before boiling | CA3 CA = Medical and toxicological databases and information systems e.g. TOXNET (click here ) 3 = Unverified data of known source |
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Not expected to self ignite; Not highly flammable | CA3 CA = Medical and toxicological databases and information systems e.g. TOXNET (click here ) 3 = Unverified data of known source |
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1.58 X 1003 | Calculated | - | |||||||
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3.2 | V3 V = ChemID online databases / IPCS INCHEM (ChemID; IPCS INCHEM ) 3 = Unverified data of known source |
High | ||||||||
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1.57 | Q2 Q = Miscellaneous internet resources 2 = Unverified data of unknown source |
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3.7 | DW4 DW = Don Wauchope personal database for Pka data: Wauchope, R. D. and Edwards, J. Dissociation constants for pesticide active ingredients: a database and comparison with predicted values. MS in preparation 4 = Verified data |
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Weak acid | |||||||||||
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1100 | L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source |
Highly volatile | ||||||||
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Degradation |
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180 | 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 |
Persistent | |||||||
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USDA data | ||||||||||
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Stable | R4 R = Peer reviewed scientific publications 4 = Verified data |
Stable | |||||||
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Stable at pH 5, 7 and 9 | ||||||||||
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Soil adsorption and mobility |
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- | US3 US = US Dept of Agriculture National Resources Conservation Service - various datasheets, databases and online sources 3 = Unverified data of known source |
Moderately mobile | |||||||
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400 | ||||||||||
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Fate indices |
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3.15 | Calculated | High leachability | ||||||||||||||||||||||||||
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4.12 X 10-01 | Calculated | - | |||||||||||||||||||||||||
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Medium | Calculated | - | ||||||||||||||||||||||||||
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Moderately mobile | Calculated | - |
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> 576 | L3 L = Pesticide manuals and hard copy reference books / other sources Rat3 = Unverified data of known source |
Moderate | ||||||||
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> 5000 | F4 F = U.S. EPA ECOTOX database / U.S. EPA pesticide fate database / Miscellaneous WHO documents (US EPA Databases Related to Pesticide Risk Assessment ) Colinus virginianus4 = Verified data |
Low | ||||||||
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> 7.50 | 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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> 4.50 | 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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19.16 | P3 P = Other governments and regulators Chlamydomonas moewusii 7 day3 = Unverified data of known source |
Low | ||||||||
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General |
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High (class III) | - | - | ||||||||
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> 576 | L3 L = Pesticide manuals and hard copy reference books / other sources Rat3 = Unverified data of known source |
Moderate | ||||||||
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1440 | L3 L = Pesticide manuals and hard copy reference books / other sources Rat3 = Unverified data of known source |
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Health issues |
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Harmful if swallowed May disturb body temperature regulation May cause hypotension |
Handling issues |
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No information available | |||
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Health: H302 Environment: H411 |
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Xn - Harmful: R22 N - Dangerous for the environment: R50, R53 |
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S2, S36, S61 | |||
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III (Slightly hazardous) | |||
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chlorfenac | ||
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chlorfenac | ||
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Chlorfenac | ||
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clorfenac | ||
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chlorofenak | ||
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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 |