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diclofop (Ref: AE F021079)
** diclofop acid ** diclofop free acid ** HOE 021079 ** 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 diclofop

Description: Post-emergence herbicide usually used as the methyl variant. Also a pesticide transformation product

Example pests controlled: Wild oats; Crowsfoot grass; Annual ryegrass; Common barbgrass

Example applications: Vegetables including brassicas, beans, carrots, peas, parsnips, onions; Sugarbeet; Cereals including barley, wheat; Oilseed rape; Potatoes

Efficacy & activity: -

Availability status: Current

Introduction & key dates: circa 1982

EC Regulation 1107/2009 (repealing 91/414):
Status Approved
Dossier rapporteur/co-rapporteur Portugal/France
Date inclusion expires 31/05/2021
EU Candidate for substitution (CfS) Yes - low ADI / ARfD / AOEL
Listed in EU database Yes

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: USA

Chemical structure: Click here for further information on the general chemical status information used on this site
Isomerism A chiral molecule. The technical material is an isomeric mixture.
Chemical formula C15H12Cl2O4
Canonical SMILES CC(C(=O)O)OC1=CC=C(C=C1)OC2=C(C=C(C=C2)Cl)Cl
Isomeric SMILES No data
International Chemical Identifier key (InChIKey) OOLBCHYXZDXLDS-UHFFFAOYSA-N
International Chemical Identifier (InChI) InChI=1S/C15H12Cl2O4/c1-9(15(18)19)20-11-3-5-12(6-4-11)21-14-7-2-10(16)8-13(14)17/h2-9H,1H3,(H,18,19)
2D structure diagram/image available? Yes

Click to access the Cambridge Crystallographic Data Centre (CCDC) website
Cambridge Crystallographic Data Centre diagrams:
Common Name Relationship Link
Diclofop-methyl Derivative Click here for the CCDC structure diagram

General status: Click here for further information on the general chemical status information used on this site
Pesticide type Herbicide, Metabolite
Metabolite Type Soil
Substance group Aryloxyphenoxypropionate
Minimum active substance purity 930 g/kg
Known relevant impurities EU dossier - None declared
Substance origin Synthetic
Mode of action Selective, absorbed by leaves and inhibits fatty acid synthesis. Inhibition of acetyl CoA carboxylase (ACCase)
CAS RN 40843-25-2
EC number -
CIPAC number 358
US EPA chemical code 110902
PubChem CID 38687
Molecular mass (g mol-1) 327.16
PIN (Preferred Identification Name) rac-(2R)-2-[4-(2,4-dichlorophenoxy)phenoxy]propanoic acid
IUPAC name (RS)-2-[4-(2,4-dichlorophenoxy)phenoxy]propionic acid
CAS name 2-[4-(2,4-dichlorophenoxy)phenoxy]propanoic acid
Other status information -
Relevant Environmental Water Quality Standards -
Herbicide Resistance Classification (HRAC) A
Herbicide Resistance Classification (WSSA) 1
Insecticide Resistance Classification (IRAC) Not applicable
Fungicide Resistance Classification (FRAC) Not applicable
Examples of recorded resistance -
Physical state Pale yellow solid
Related substances & organisms

Can be a metabolite of:
Parent Formation medium Estimated maximum occurrence fraction 1107/2009 relevancy Click here for further information on 1107/2009 relevancy
diclofop-methyl Soil   0.87   -

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
  • Bayer CropScience
  • Bayer Environmental
Example products using this active
  • Hoe-Grass
  • Hoelon 3EC
  • Illoxan
  • One-shot
UK LERAP status No UK approval for use as a pesticide under EC Regulation 1107/2009
Formulation and application details Usually supplied as an emulsion that is mixed with water and used as a spray.


ENVIRONMENTAL FATE

for diclofop

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) 122700 A5 High
Solubility - In organic solvents at 20oC (mg l-1) - - -
Melting point (oC) - - -
Boiling point (oC) - - -
Degradation point (oC) - - -
Flashpoint (oC) - - -
Octanol-water partition coefficient at pH 7, 20oC P 4.07 X 1001 Calculated -
Log P 1.61 L3 Low
Bulk density (g ml-1)/Specific gravity 1.4 L3 -
Dissociation constant (pKa) at 25oC 3.43 L3 -
Note: Weak acid
Vapour pressure at 20oC (mPa) 0.0000031 L3 Low volatility
Henry's law constant at 25oC (Pa m3 mol-1) - - -
GUS leaching potential index Click here for a note on the limitations of the GUS index 2.12 Calculated Transition state
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 7.98 X 10-02 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) - - -

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) 24 A4 Non-persistent
DT50 (lab at 20oC) 23.9 A5 Non-persistent
DT50 (field) 35.2 A5 Moderately persistent
DT90 (lab at 20oC) 84.7 A5 -
DT90 (field) - - -
DT50 modelling endpoint - - -
Note EU dossier lab studies DT50 range 5.1-74.0 days, DT90 range 23.3-246 days, Field studies DT50 range 25.7-52.2 days ; General literature DT50 range 10 days (sand) - 30 days (sandy clay)
Dissipation rate RL50 on plant matrix Value - - -
Note -
Dissipation rate RL50 on and in plant matrix Value - - -
Note -
Aqueous photolysis DT50 (days) at pH 7 Value - - -
Note -
Aqueous hydrolysis DT50 (days) at 20oC and pH 7 Value - - -
Note -
Water-sediment DT50 (days) 58.3 A5 Moderately fast
Water phase only DT50 (days) - - -

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 - - -
Koc -
Notes and range -
Freundlich Kf 6.3 A5 Moderately mobile
Kfoc 289
1/n 0.882
Notes and range EU dossier kf range 0.76-13.54 mL/g, kfoc range 148-505.5 mL/g, 1/n range 0.819-0.913, Soils=6
pH sensitivity Yes


ECOTOXICOLOGY

for diclofop

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) Low risk A5 Based on LogP < 3 Low potential
CT50 (days) - -
Mammals - Acute oral LD50 (mg kg-1) > 586 V3 Rat Moderate
Mammals - Short term dietary NOEL (mg kg-1) - - -
(ppm diet) - -
Birds - Acute LD50 (mg kg-1) > 10000 V3 Phasianidae Low
Birds - Short term dietary (LC50/LD50) - - -
Fish - Acute 96 hour LC50 (mg l-1) > 100 A5 Oncorhynchus mykiss Low
Fish - Chronic 21 day NOEC (mg l-1) 16.0 A5 Oncorhynchus mykiss Low
Aquatic invertebrates - Acute 48 hour EC50 (mg l-1) 48 A5 Daphnia magna Moderate
Aquatic invertebrates - Chronic 21 day NOEC (mg l-1) 0.0156 A5 Daphnia magna Moderate
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) 10 A5 Chironomus riparius Moderate
Sediment dwelling organisms - Chronic 28 day NOEC, sediment (mg kg-1) - - -
Aquatic plants - Acute 7 day EC50, biomass (mg l-1) - - -
Non-target plants - - -
- - -
Algae - Acute 72 hour EC50, growth (mg l-1) 10.4 F4 Pseudokirchneriella subcapitata Low
Algae - Chronic 96 hour NOEC, growth (mg l-1) - - -
Honeybees (Apis spp.) Contact acute LD50 (worst case from 24 , 48 and 72 hour values - μg bee-1) > 100 A4, as methyl variant Low
Oral acute LD50 (worst case from 24 , 48 and 72 hour values - μg bee-1) > 131 A4, as methyl variant Low
Unknown mode acute LD50 (worst case from 24 , 48 and 72 hour values - μg bee-1) - - -
Bumblebees (Bombus spp.) Contact acute LD50 (worst case from 24 , 48 and 72 hour values - μg bee-1) - - -
-
Oral acute LD50 (worst case from 24 , 48 and 72 hour values - μg bee-1) - - -
-
Mason bees (Osmia spp.) Contact acute LD50 (worst case from 24 , 48 and 72 hour values - μg bee-1) - - -
Oral acute LD50 (worst case from 24 , 48 and 72 hour values - μg bee-1) - - -
Other pollinators (1) Acute LD50 (worst case from 24 , 48 and 72 hour values - μg insect-1) - - -
Mode of exposure -
Other pollinators (2) Acute LD50 (worst case from 24 , 48 and 72 hour values - μg insect-1) - - -
Mode of exposure -
Earthworms - Acute 14 day LC50 (mg kg-1) > 500 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 diclofop

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) > 586 V3 Rat Moderate
Mammals - Dermal LD50 (mg kg-1 body weight) - - -
Mammals - Inhalation LC50 (mg l-1) - - -
Other Mammal toxicity endpoints - -
ADI - Acceptable Daily Intake (mg kg-1bw day-1) 0.001 A5 -
ARfD - Acute Reference Dose (mg kg-1bw day-1) 0.03 A5 -
AAOEL - Acute Acceptable Operator Exposure Level (mg kg-1 bw day-1) - - -
AOEL - Acceptable Operator Exposure Level - Systemic (mg kg-1bw day-1) 0.003 A5 -
Dermal penetration studies (%) - - -
Dangerous Substances Directive 76/464 - - -
Exposure Limits - - -
Exposure Routes Public -
Occupational Readily absorbed through the gastrointestinal tract
European MRLs Click here for the EU MRL pesticide database
Drinking Water Standards - - -
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 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 or oxidising
CLP classification 2013 None allocated at this time
EC Risk Classification Click here to view information omn the EU risk phrases Xn - Harmful: R22, R43
N - Dangerous for the environment: R50, R53
EC Safety Classification Click here to view information omn the EU safety phrases S2, S24, S37, S60, S61
WHO Classification III - Slightly hazardous
US EPA Classification (formulation) II - Warning - Moderately toxic
UN Number -
Waste disposal & packaging Click here for a description of UN packaging marks -


TRANSLATIONS

for diclofop

Language Name
English diclofop
French -
German -
Danish -
Italian -
Spanish -
Greek -
Slovenian diklofob
Polish dichlofop
Swedish -
Hungarian -
Dutch -

Record last updated: Wednesday 31 October 2018
Contact: aeru@herts.ac.uk