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MCPA-thioethyl
** phenolthiol ** 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-thioethyl

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

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 gras

Efficacy & activity: -

Availability status: Current

Introduction & key dates: 1973

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 C11H13ClO2S
Canonical SMILES CCSC(=O)COC1=C(C=C(C=C1)Cl)C
Isomeric SMILES No data
International Chemical Identifier key (InChIKey) AZFKQCNGMSSWDS-UHFFFAOYSA-N
International Chemical Identifier (InChI) InChI=1S/C11H13ClO2S/c1-3-15-11(13)7-14-10-5-4-9(12)6-8(10)2/h4-6H,3,7H2,1-2H3
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
MCPA 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
Substance group Aryloxyalkanoic acid
Minimum active substance purity 920 g/kg
Known relevant impurities EU dossier - None declared
Substance origin Synthetic
Mode of action Selective, systemic with translocation. Synthetic auxin.
CAS RN 25319-90-8
EC number 246-831-4
CIPAC number 8205
US EPA chemical code 431500
PubChem CID 32876
Molecular mass (g mol-1) 244.74
PIN (Preferred Identification Name) S-ethyl (4-chloro-2-methylphenoxy)ethanethioate
IUPAC name S-ethyl 4-chloro-o-tolyloxythioacetate
CAS name S-ethyl (4-chloro-2-methylphenoxy)ethanethioate
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 Solid
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 -
Example products using this active -
UK LERAP status None
Formulation and application details Often supplied as soluble concentrate that is mixed with water and used as a spray.


ENVIRONMENTAL FATE

for MCPA-thioethyl

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) 2.28 A5 Low
Solubility - In organic solvents at 20oC (mg l-1) 1000000 A5 - Acetone -
144000 A5 - Methanol -
1000000 A5 - Ethyl acetate -
1000000 A5 - Xylene -
Melting point (oC) 41 A5 -
Boiling point (oC) - - -
Degradation point (oC) - - -
Flashpoint (oC) - - -
Octanol-water partition coefficient at pH 7, 20oC P 2.82 X 1004 Calculated -
Log P 4.45 A5 High
Bulk density (g ml-1)/Specific gravity 1.291 A5 -
Dissociation constant (pKa) at 25oC Not applicable A5 -
Note: No dissociation
Vapour pressure at 20oC (mPa) 0.13 A5 Low volatility
Henry's law constant at 25oC (Pa m3 mol-1) 0.2102 A5 Moderately volatile
GUS leaching potential index Click here for a note on the limitations of the GUS index 1.37 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 3.58 X 10-03 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) 4.4 A5 Non-persistent
DT50 (lab at 20oC) 4.4 A5 Non-persistent
DT50 (field) - - -
DT90 (lab at 20oC) - - -
DT90 (field) - - -
DT50 modelling endpoint - - -
Note: -
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 1 A3 Moderately fast
Note -
Aqueous hydrolysis DT50 (days) at 20oC and pH 7 Value - - -
Note -
Water-sediment DT50 (days) - - -
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 - A3 Mobile
Koc 74
Notes and range EU dossier value for MCPA
Freundlich Kf - - -
Kfoc -
1/n -
Notes and range -
pH sensitivity -

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) This metabolite may cause environmental pollution, click here for further information Soil   0.66   Major fraction, Relevant
2-methyl-4-chlorophenol This metabolite may cause environmental pollution, click here for further information Soil   0.198   Major fraction, Relevant


ECOTOXICOLOGY

for MCPA-thioethyl

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) - - -
CT50 (days) - -
Mammals - Acute oral LD50 (mg kg-1) 450 A5 Rat Moderate
Mammals - Short term dietary NOEL (mg kg-1) - - -
(ppm diet) - -
Birds - Acute LD50 (mg kg-1) > 400 A4 Colinus virginianus Moderate
Birds - Short term dietary (LC50/LD50) > 1040 mg kg feed-1 A3 Colinus virginianus -
Fish - Acute 96 hour LC50 (mg l-1) 0.3 A5 Oncorhynchus mykiss Moderate
Fish - Chronic 21 day NOEC (mg l-1) 0.2 A5 Salmo gairneri Moderate
Aquatic invertebrates - Acute 48 hour EC50 (mg l-1) 0.58 A5 Daphnia magna Moderate
Aquatic invertebrates - Chronic 21 day NOEC (mg l-1) 0.009 A5 Daphnia magna High
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) - - -
Non-target plants - - -
- - -
Algae - Acute 72 hour EC50, growth (mg l-1) > 2.3 A5 Scenedemus subspicatus Moderate
Algae - Chronic 96 hour NOEC, growth (mg l-1) - - -
Honeybees Contact acute 48 hour LD50 (μg bee-1) - - -
Oral acute 48 hour LD50 (μg bee-1) > 100 A4, as formulation Low
Unknown mode acute 48 hour LD50 (μg bee-1) - - -
Earthworms - Acute 14 day LC50 (mg kg-1) 140.5 A5 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 Nitrogen mineralisation: No significant adverse effect
Carbon mineralisation: No significant adverse effect
A5
Dose: 1.224 kg ha-1, 28 days
-
Mesocosm study data NOEAEC mg l-1 - - -
NOEAEC mg l-1 - - -


HUMAN HEALTH AND PROTECTION

for MCPA-thioethyl

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) 450 A5 Rat Moderate
Mammals - Dermal LD50 (mg kg-1 body weight) > 5000 A5 Rat -
Mammals - Inhalation LC50 (mg l-1) 0.044 L3 Rat, 4 hr -
Other Mammal toxicity endpoints - -
ADI - Acceptable Daily Intake (mg kg-1bw day-1) 0.013 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 (%) - - -
Dangerous Substances Directive 76/464 List II as MCPA - -
Exposure Limits - - -
Exposure Routes Public -
Occupational -
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

: 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
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
EC Safety Classification Click here to view information omn the EU safety phrases S2, S26, S37, S39
WHO Classification II - Moderately hazardous
US EPA Classification (formulation) No consensus across products or no products available - -
UN Number -
Waste disposal & packaging Click here for a description of UN packaging marks -


TRANSLATIONS

for MCPA-thioethyl

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

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