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GET ADDITIONAL DATA HERE!

MCPA (Ref: BAS 009H)
** metaxon ** BAS 101H ** BAS 141H ** MCP ** 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 MCPA

Description: A herbicide for control of annual and perennial weeds in cereals and other crops. Can also be a pesticide transformation product.

Example pests controlled: Annual and perennial broad-leaved weeds including Charlock, Wild radish, Dandylion, Capeweed, Fat hen and Hedge mustards

Example applications: Wheat; Oats; Tritical; Rye; Establish grass; Lindseed; Asparagus

Efficacy & activity: -

Availability status: Current

Introduction & key dates: circa 1950

EC Regulation 1107/2009 (repealing 91/414):
Status Approved
Dossier rapporteur/co-rapporteur Poland/Netherlands
Date inclusion expires 31/10/2019
EU Candidate for substitution (CfS) No
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: Australia, USA

Chemical structure: Click here for further information on the general chemical status information used on this site
Isomerism None
Chemical formula C9H9ClO3
Canonical SMILES CC1=C(C=CC(=C1)Cl)OCC(=O)O
Isomeric SMILES No data
International Chemical Identifier key (InChIKey) WHKUVVPPKQRRBV-UHFFFAOYSA-N
International Chemical Identifier (InChI) InChI=1S/C9H9ClO3/c1-6-4-7(10)2-3-8(6)13-5-9(11)12/h2-4H,5H2,1H3,(H,11,12)
Structure diagram/image available? Yes

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 Aryloxyalkanoic acid
Minimum active substance purity 930 mg/kg
Known relevant impurities EU dossier - None declared
Substance origin Synthetic
Mode of action Selective, systemic with translocation. Synthetic auxin.
CAS RN 94-74-6
EC number 202-360-6
CIPAC number 2
US EPA chemical code 030501
PubChem CID 7204
Molecular mass (g mol-1) 200.62
PIN (Preferred Identification Name) -
IUPAC name 4-chloro-o-tolyloxyacetic acid
CAS name (4-chloro-2-methylphenoxy)acetic acid
Other status information Potential groundwater contaminant
Relevant Environmental Water Quality Standards UK Environment Agency non-statutory standard for the protection of freshwater aquatic life pH <7: 12 ug/L, pH >7 80 ug/L as annual average; pH <7: 120 ug/L, pH >7 800 ug/L as max acceptable conc. For salt water 80 ug/L as annual average, 800 ug/L as max acceptable conc.] Non-statutory WHO drinking water guideline 0.002 mg/L
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 Raphanus raphanistrum
Sisymbrium orientale
Physical state White crystalline powder
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
MCPB Soil   0.062   Minor fraction, Relevant
MCPA-thioethyl Soil   0.66   Major fraction, Relevant

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
  • BASF
  • Bayer Environ
  • Dow AgroSciences
  • DuPont
  • Headland Agrochemicals
  • Luxan
  • Nufarm
  • Scotts
Example products using this active
  • Agritox
  • Agroxone
  • Cedar
  • Esteem
  • GoLow Power
  • Polo
  • Relay P
  • Spear
  • Tropotox Plus
UK LERAP status None
Formulation and application details Often supplied as soluble concentrate, wettable powder or emulsifiable concentrate.


ENVIRONMENTAL FATE

for MCPA

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) 29390 A5 High
Solubility - In organic solvents at 20oC (mg l-1) 323 A5 - Hexane -
289300 A5 - Ethyl acetate -
775600 A5 - Methanol -
26500 A5 - Toluene -
Melting point (oC) 116 A5 -
Boiling point (oC) Decomposes before boiling A4 -
Degradation point (oC) 290 A5 -
Flashpoint (oC) Not expected to self ignite; Not highly flammable A4 -
Octanol-water partition coefficient at pH 7, 20oC P 1.55 X 10-01 Calculated -
Log P -0.81 A5 Low
Bulk density (g ml-1)/Specific gravity 1.41 A5 -
Dissociation constant (pKa) at 25oC 3.73 A5 -
Note: Weak acid
Vapour pressure at 20oC (mPa) 0.4 A5 Low volatility
Henry's law constant at 25oC (Pa m3 mol-1) 5.50 X 10-05 A5 Non-volatile
GUS leaching potential index Click here for a note on the limitations of the GUS index 2.94 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 2.24 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 No absorption >290nm A5 -
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 A5 Non-persistent
DT50 (lab at 20oC) 24 A5 Non-persistent
DT50 (field) 25 H4 Non-persistent
DT90 (lab at 20oC) 79 A4 @25 degC -
DT90 (field) - - -
DT50 modelling endpoint - - -
Note EU dossier lab studies DT50 range 7-41 days
Dissipation rate RL50 on plant matrix Value - - -
Note -
Dissipation rate RL50 on and in plant matrix Value 4.2 R4 -
Note Published literature RL50 range 2.9-6.2 days, 5 field crops, various matrices, n=6
Aqueous photolysis DT50 (days) at pH 7 Value 0.05 A4 Fast
Note Rapid DT50 ~ 1 hour pH 5 to pH 9 at 25 degC in test conditions, DT50 25.4 days in natural sunlight pH 5
Aqueous hydrolysis DT50 (days) at 20oC and pH 7 Value Stable A5 -
Note Stable pH 5 to pH 9 at 25 degC
Water-sediment DT50 (days) 17 A5 Fast
Water phase only DT50 (days) 13.5 A5 Moderately fast

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 0.94 A5 Mobile
Kfoc 74
1/n 0.68
Notes and range (1) EU dossier Kf range 0.05-1.99 mL/g; Kfoc range 38-157 mL/g, 1/n range 0.50-0.72; Soils=8; (2) Mean of 2 Norweigan soils. Fine sandy loam - Sand 49% Silt 46% Clay 5% oc=1.4% pH=6.3 Kf=1.41 1/Soils=0.74; Loam - Sand 36% Silt 45% Clay 19% OC=2.5% pH=5.5 Kf=1.50 1/n=0.81 [R4]
pH sensitivity Less adsorption as pH increases

Key metabolites:
Metabolite Formation medium Estimated maximum occurrence fraction 1107/2009 relevancy Click here for further information on 1107/2009 relevancy
2-methyl-4-chlorophenol Soil   0.09   Minor fraction, Relevant
cloxyfonac Soil   -   -


ECOTOXICOLOGY

for MCPA

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) 1 A5 Low potential
CT50 (days) Not available -
Mammals - Acute oral LD50 (mg kg-1) 962 A5 Rat Moderate
Mammals - Short term dietary NOEL (mg kg-1) 60 A5 Rat High
(ppm diet) - -
Birds - Acute LD50 (mg kg-1) 234 A5 Colinus virginianus Moderate
Birds - Short term dietary (LC50/LD50) > 983 mg kg bw-1 day-1 A5 Colinus virginianus -
Fish - Acute 96 hour LC50 (mg l-1) > 72 F4 Oncorhynchus mykiss Moderate
Fish - Chronic 21 day NOEC (mg l-1) 15 A5 Pimephales promelas Low
Aquatic invertebrates - Acute 48 hour EC50 (mg l-1) > 190 A5 Daphnia magna Low
Aquatic invertebrates - Chronic 21 day NOEC (mg l-1) 50 A5 Daphnia magna 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) - - -
Sediment dwelling organisms - Chronic 28 day NOEC, sediment (mg kg-1) - - -
Aquatic plants - Acute 7 day EC50, biomass (mg l-1) 0.152 A4 Lemna gibba, IC50 Moderate
Non-target plants - - -
- - -
Algae - Acute 72 hour EC50, growth (mg l-1) 79.8 A5 Pseudokirchneriella subcapitata Low
Algae - Chronic 96 hour NOEC, growth (mg l-1) 60 Q2 Unknown species Low
Honeybees Contact acute 48 hour LD50 (μg bee-1) > 200 A5 Low
Oral acute 48 hour LD50 (μg bee-1) > 200 A5 Low
Unknown mode acute 48 hour LD50 (μg bee-1) - - -
Earthworms - Acute 14 day LC50 (mg kg-1) 325 A5 Eisenia foetida 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 100 Mortality
Dose: 2.1 L/ha
A5 Aphidius rhopalosiphi
-
Other arthropod (2) LR50 g ha-1 - - -
% Effect 0 Mortality
Dose: 2.0 L/ha
A5 Typhlodromus pyri
-
Soil micro-organisms Nitrogen mineralisation: No significant adverse effect
Carbon mineralisation: No significant adverse effect
A5
Dose: 10x field rate
-
Mesocosm study data NOEAEC mg l-1 - - -
NOEAEC mg l-1 - - -


HUMAN HEALTH AND PROTECTION

for MCPA

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) 962 A5 Rat Moderate
Mammals - Dermal LD50 (mg kg-1 body weight) > 4000 A5 Rat -
Mammals - Inhalation LC50 (mg l-1) > 6.36 A5 Rat, 4 hr -
Other Mammal toxicity endpoints - -
ADI - Acceptable Daily Intake (mg kg-1bw day-1) 0.05 A5 Rat, SF=100 -
ARfD - Acute Reference Dose (mg kg-1bw day-1) 0.15 A5 Rabbit, SF=100 -
AAOEL - Acute Acceptable Operator Exposure Level (mg kg-1 bw day-1) - - -
AOEL - Acceptable Operator Exposure Level - Systemic (mg kg-1bw day-1) 0.04 A5 Rat, SF=100 -
Dermal penetration studies (%) 2.2-2.5 A5 concentration dependent -
Dangerous Substances Directive 76/464 List II - -
Exposure Limits - - -
Exposure Routes Public May be absorbed through the skin
Occupational Occupational exposure may occur through inhalation and dermal contact
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 Highly toxic
May cause hypotension
Possible 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 IMDG Transport Code is usually 9
CLP classification 2013 Health: H302, H315, H318
Environment: H400, H410
EC Risk Classification Click here to view information omn the EU risk phrases Xn - Harmful: R22, R41
Xi - Irritant: R38
N - Dangerous for the environment: R50, R53
EC Safety Classification Click here to view information omn the EU safety phrases S2, S26, S37, S39, S60, S61
WHO Classification II - Moderately hazardous
US EPA Classification (formulation) III - Caution - Slightly toxic
UN Number Usually 2765 or 3082
Waste disposal & packaging Click here for a description of UN packaging marks Packaging Group III (minor danger)


TRANSLATIONS

for MCPA

Language Name
English MCPA
French MCPA
German MCPA
Danish MCPA
Italian MCPA
Spanish MCPA
Greek MCPA
Slovenian MCPA
Polish MCPA
Swedish MCPA
Hungarian MCPA
Dutch MCPA

Record last updated: Monday 05 November 2018
Contact: aeru@herts.ac.uk