Select Option
Home
A to Z
Search
Terms & Conditions
Support Information
Purchasing & Other Services
Video User Guides
GET ADDITIONAL DATA HERE!

MCPB (Ref: MB 3046)
** 2,4-MCPB ** L-338 ** MCPB acid ** 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 MCPB

Description: A herbicide for post-emergence control of annual and perennial broad-leaved weeds

Example pests controlled: Thistles; Docks; Buttercups; Fat hen; Shepherds purse; Nightshade; Nettles; Plantains; Ragwort; Hedge mustard; Bindweed

Example applications: Newly sown pastures; Clover seed crops; Peas; cereals undersown with ryegrass or clover

Efficacy & activity: -

Availability status: Current

Introduction & key dates: circa 1960

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

Chemical structure: Click here for further information on the general chemical status information used on this site
Isomerism -
Chemical formula C11H13ClO3
Canonical SMILES CC1=C(C=CC(=C1)Cl)OCCCC(=O)O
Isomeric SMILES No data
International Chemical Identifier key (InChIKey) LLWADFLAOKUBDR-UHFFFAOYSA-N
International Chemical Identifier (InChI) InChI=1S/C11H13ClO3/c1-8-7-9(12)4-5-10(8)15-6-2-3-11(13)14/h4-5,7H,2-3,6H2,1H3,(H,13,14)
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
Substance group Aryloxyalkanoic acid
Minimum active substance purity 840 g/kg
Known relevant impurities EU dossier - free phenols <30g/Kg as 4-chloro-2-methylphenol, triethanolamine insolubles <1g/kg
Substance origin Synthetic
Mode of action Selective, systemic, absorbed by leaves and roots with translocation. Synthetic auxin.
CAS RN 94-81-5
EC number 202-365-3
CIPAC number 50
US EPA chemical code 019201
PubChem CID 7207
Molecular mass (g mol-1) 228.67
PIN (Preferred Identification Name) -
IUPAC name 4-(4-chloro-o-tolyloxy)butyric acid
CAS name 4-(4-chloro-2-methylphenoxy)butanoic acid
Other status information -
Relevant Environmental Water Quality Standards -
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 powder
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
  • BASF
  • Headland
  • Nufarm
  • United Phosphorus
Example products using this active
  • Butoxone
  • Tropotox
  • Tropotox Plus
  • Thistrol
UK LERAP status None
Formulation and application details Often supplied as soluble concentrate or in liquid formulations.


ENVIRONMENTAL FATE

for MCPB

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) 4400 A5 High
Solubility - In organic solvents at 20oC (mg l-1) 313000 A5 - Acetone -
169000 A5 - Dichloromethane -
266 C4 - Hexane -
150000 L3 - Ethanol -
Melting point (oC) 98 A5 -
Boiling point (oC) 623 A4 - (some decomposition) -
Degradation point (oC) 623 A5 -
Flashpoint (oC) Not expected to self ignite; Not highly flammable A5 -
Octanol-water partition coefficient at pH 7, 20oC P 2.09 X 1001 Calculated -
Log P 1.32 A5 Low
Bulk density (g ml-1)/Specific gravity 1.233 A5 -
Dissociation constant (pKa) at 25oC 4.5 A5 -
Note: Weak acid
Vapour pressure at 20oC (mPa) 0.004 A5 Low volatility
Henry's law constant at 25oC (Pa m3 mol-1) 3.0 X 10-05 A5 Non-volatile
GUS leaching potential index Click here for a note on the limitations of the GUS index 1.64 Calculated Low 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 1.03 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 228nm = 9827, 278nm = 1714 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) 7 A5 Non-persistent
DT50 (lab at 20oC) 6.8 A5 Non-persistent
DT50 (field) - - -
DT90 (lab at 20oC) 22.6 A5 -
DT90 (field) - - -
DT50 modelling endpoint - - -
Note EU dossier Lab studies DT50 range 2-11 days
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 2.6 A5 Moderately fast
Note Rapid photolysis at pH 5 to pH 9 under irradiated conditions
Aqueous hydrolysis DT50 (days) at 20oC and pH 7 Value Stable A5 -
Note Stable pH 5 to pH 9, 30 days
Water-sediment DT50 (days) 17 A5 Fast
Water phase only DT50 (days) 9.7 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 - A5 Moderately mobile
Kfoc 108
1/n 0.819
Notes and range EU dossier Kfoc range 86-130 mL/g
pH sensitivity Adsorption increases as pH decreases

Key metabolites:
Metabolite Formation medium Estimated maximum occurrence fraction 1107/2009 relevancy Click here for further information on 1107/2009 relevancy
MCPA (Ref: BAS 009H) Soil   0.062   Minor fraction, Relevant
cloxyfonac Soil   0.095   Minor fraction, Not relevant


ECOTOXICOLOGY

for MCPB

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) 4300 A5 Rat Low
Mammals - Short term dietary NOEL (mg kg-1) - L2 Rat, 2 year -
(ppm diet) > 100 -
Birds - Acute LD50 (mg kg-1) 282 A5 Colinus virginianus Moderate
Birds - Short term dietary (LC50/LD50) > 5000 mg kg feed-1 A5 Colinus virginianus -
Fish - Acute 96 hour LC50 (mg l-1) 4.3 A5 Oncorhynchus mykiss Moderate
Fish - Chronic 21 day NOEC (mg l-1) 40 A5 Oncorhynchus mykiss Low
Aquatic invertebrates - Acute 48 hour EC50 (mg l-1) 55 A5 Daphnia magna Moderate
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) 37 A5 Lemna gibba Low
Non-target plants - - -
- - -
Algae - Acute 72 hour EC50, growth (mg l-1) 41.0 A5 Pseudokirchneriella subcapitata Low
Algae - Chronic 96 hour NOEC, growth (mg l-1) - - -
Honeybees Contact acute 48 hour LD50 (μg bee-1) > 100 A5 Low
Oral acute 48 hour LD50 (μg bee-1) > 81.8 A5 Moderate
Unknown mode acute 48 hour LD50 (μg bee-1) - - -
Earthworms - Acute 14 day LC50 (mg kg-1) > 252 Q3 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 4000 >
A5 Aphidius rhopalosiphi
-
% Effect - - -
Other arthropod (2) LR50 g ha-1 2000 >
A5 Typhlodromus pyri
-
% Effect - - -
Soil micro-organisms Nitrogen mineralisation: Effect noted but recovery by day 42
Carbon mineralisation: No significant adverse effect
A5
Dose: 10 kg ha-1
-
Mesocosm study data NOEAEC mg l-1 - - -
NOEAEC mg l-1 - - -


HUMAN HEALTH AND PROTECTION

for MCPB

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) 4300 A5 Rat Low
Mammals - Dermal LD50 (mg kg-1 body weight) > 2000 A5 Rat -
Mammals - Inhalation LC50 (mg l-1) > 1.14 A5 Rat, 4 hr -
Other Mammal toxicity endpoints - -
ADI - Acceptable Daily Intake (mg kg-1bw day-1) 0.01 A5 Rat, SF=100 -
ARfD - Acute Reference Dose (mg kg-1bw day-1) 0.05 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) 0.06 A5 Rat, SF=100 -
Dermal penetration studies (%) - - -
Dangerous Substances Directive 76/464 - - -
Exposure Limits - - -
Exposure Routes Public -
Occupational Occupational exposure may occur through dermal contact and inhalation of dust and sprays
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 Harmful or fatal if swallowed
Causes irreversible eye damage

: 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 Environment: H400, H410
EC Risk Classification Click here to view information omn the EU risk phrases N - Dangerous for the environment: R50, R53
EC Safety Classification Click here to view information omn the EU safety phrases S60, S61
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 MCPB

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

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