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omethoate (Ref: ENT 25776)
** dimethoate-met ** dimethoxon ** Translations

Environmental Fate - Ecotoxicology - Human Health - A to Z Index - Home

GENERAL INFORMATION
for omethoate

Description: An insecticide and acaricide to control a wide range of pests including aphids, mites, caterpillars and beetles. Also a pesticide transformation product

Introduction: circa 1960

EC Regulation 1107/2009 (repealing 91/414):
Status Not approved
Dossier rapporteur/co-rapporteur -
Date inclusion expires Expired

Approved for use () or known to be used () in the following European countries:

AT

BE

BG

CY

CZ

DE

DK

EE

EL

ES

FI

FR

HU

IE

IT

LT

LU

LV

MT

NL

PL

PT

RO

SE

SI

SK

UK

Also registered in: Australia

General status:
Pesticide type Insecticide, Acaricide, Metabolite
Metabolite Type Soil
Substance group Organophosphate
Substance origin Synthetic
Mode of action Systemic with contact and stomach action. Acetylcholinesterase (AChE) inhibitor.
CAS RN 1113-02-6
EC number 214-197-8
CIPAC number 202
US EPA chemical code -
Chiral molecule No
Chemical formula C5H12NO4PS
SMILES O=C(NC)CSP(=O)(OC)OC
International Chemical Identifier key (InChIKey) PZXOQEXFMJCDPG-UHFFFAOYSA-N
International Chemical Identifier (InChI) InChI=1S/C5H12NO4PS/c1-6-5(7)4-12-11(8,9-2)10-3/h4H2,1-3H3,(H,6,7)
Structure diagram/image available? Yes
Molecular mass (g mol-1) 213.2
PIN (Preferred Identification Name) -
IUPAC name 2-dimethoxyphosphinoylthio-N-methylacetamide
CAS name O,O-dimethyl S-[2-(methylamino)-2-oxoethyl] phosphorothioate
Other status information -
Herbicide Resistance Classification (HRAC) Not applicable
Herbicide Resistance Classification (WSSA) Not applicable
Insecticide Resistance Classification (IRAC) 1B
Fungicide Resistance Classification (FRAC) Not applicable
Physical state Colourless liquid
Related substances & organisms -

Can be a metabolite of:
Parent Formation medium Estimated maximum occurrence fraction 91/414 relevancy
dimethoate Soil   0.020   Minor fraction, Not relevant

Formulations:
Property Value
Example manufacturers & suppliers of products using this active
  • Bayer CropScience
  • King Tech Corp.
Example products using this active
  • Le-ma 290 SL
  • Atease
  • Modern
UK LERAP status No UK approval for use or outside scope
Formulation and application details Usually supplied as a soluble concentrate.


ENVIRONMENTAL FATE

for omethoate

Property Value Source/Quality Score/Other Information Interpretation
Solubility - In water at 20oC (mg l-1) 10000 K4 High
Solubility - In organic solvents at 20oC (mg l-1) Miscible L3 - Acetone -
Miscible L3 - Methanol -
Melting point (oC) -28 L3 - Solidifies -
Boiling point (oC) 135 V3 -
Degradation point (oC) - - -
Flashpoint (oC) 128 L3 -
Octanol-water partition coefficient at pH 7, 20oC P 1.82 X 10-01 Calculated -
Log P -0.74 B5 Low
Bulk density (g ml-1)/Specific gravity 1.32 B5 -
Dissociation constant (pKa) at 25oC - - -
Note:
Vapour pressure at 25oC (mPa) 3.3 B5 Intermediate state
Henry's law constant at 25oC (Pa m3 mol-1) 4.62 X 10-09 V3 Non-volatile
Henry's law constant at 20oC (dimensionless) 2.90 X 10-08 K3 Non-volatile
GUS leaching potential index 2.73 Calculated Transition state
SCI-GROW groundwater index (μg l-1) for a 1 kg ha-1 or 1 l ha-1 application rate Value 2.36 X 10-03 Calculated -
Note -
Potential for particle bound transport index - Calculated Low
Maximum UV-vis absorption L mol-1 cm-1 - - -
Surface tension (mN m-1) - - -

Degradation:
Property Value Source/Quality Score/Other Information Interpretation
Soil degradation (days) (aerobic) DT50 (typical) 14 B5 Non-persistent
DT50 (lab at 20oC) 2.8 E4 Non-persistent
DT50 (field) 14 B5 Non-persistent
DT90 (lab at 20oC) - - -
DT90 (field) - - -
Note: -
Aqueous photolysis DT50 (days) at pH 7 Value Stable B4 Stable
Note -
Aqueous hydrolysis DT50 (days) at 20oC and pH 7 Value 17 B5 Non-persistent
Note -
Water-sediment DT50 (days) 4.5 K4 Fast
Water phase only DT50 (days) - - -

Soil adsorption and mobility:
Property Value Source/Quality Score/Other Information Interpretation
Linear Kd 0.53 A5 Mobile
Koc 41.3
Notes and range EU dossier Kd range 0.20-0.99 mL/g, Koc range16-87 mL/g, Soils=3
Freundlich Kf - - -
Kfoc -
1/n -
Notes and range -
pH sensitivity -


ECOTOXICOLOGY

for omethoate

Property Value Source/Quality Score/Other Information Interpretation
Bio-concentration factor BCF 75 Q2 Estimated Low potential
CT50 (days) Not available -
Bioaccumulation potential - Calculated Low
Mammals - Acute oral LD50 (mg kg-1) 50.0 F4 Rat High
Mammals - Short term dietary NOEL (mg kg-1) - B5 Rat -
(ppm diet) 0.5 -
Birds - Acute LD50 (mg kg-1) 9.9 A5 Colinus virginianus High
Birds - Short term dietary (LC50/LD50) - - -
Fish - Acute 96 hour LC50 (mg l-1) 9.1 B5 Oncorhynchus mykiss Moderate
Fish - Chronic 21 day NOEC (mg l-1) - - -
Aquatic invertebrates - Acute 48 hour EC50 (mg l-1) 0.022 B5 Daphnia magna High
Aquatic invertebrates - Chronic 21 day NOEC (mg l-1) 0.000004 P3 Unknown species -
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) - - -
Algae - Acute 72 hour EC50, growth (mg l-1) 167.5 B5 Scenedemus subspicatus Low
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) 0.048 B5 High
Unknown mode acute 48 hour LD50 (μg bee-1) - - -
Earthworms - Acute 14 day LC50 (mg kg-1) 46 B5 Eisenia andrei 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 omethoate

General:
Property Value Source/Quality Score/Other Information Interpretation
Mammals - Acute oral LD50 (mg kg-1) 50.0 F4 Rat High
Mammals - Dermal LD50 (mg kg-1 body weight) 145.0 L3 Rat -
Mammals - Inhalation LC50 (mg l-1) 0.3 L3 Rat -
Other Mammal toxicity endpoints - -
ADI - Acceptable Daily Intake (mg kg-1bw day-1) 0.0003 BA5; EU 2006 -
ARfD - Acute Reference Dose (mg kg-1bw day-1) 0.002 BA5; EU 2006 -
AOEL - Acceptable Operator Exposure Level - Systemic (mg kg-1bw day-1) 0.0003 BA5; EU 2006 -
Dermal penetration studies (%) - - -
Dangerous Substances Directive 76/464 List I; List II - -
Exposure Limits - - -
Exposure Routes Public -
Occupational Occupational exposure may occur through inhalation and dermal contact
Examples of European MRLs (mg kg-1) Value Cherries: 0.4; Onions, root vegetables, tuber vegetables, bush fruit, cane fruit, grapes and strawberries: 0.1; Other vegetables and other fruit: 0.2
Note Current May 2007.
For the EU pesticides database click here
Drinking Water MAC (μg l-1) - - -

Health issues:
Carcinogen Mutagen Endocrine disrupter Reproduction / development effects Cholinesterase inhibitor Neurotoxicant Respiratory tract irritant Skin irritant Eye irritant

-

-

-

General human health issues Toxic if swallowed
May cause cyanosis
Skin sensitiser

: Yes, known to cause a problem
: No, known not to cause a problem
: Possibly, status not identified
- : No data

Handling issues:
Property Value Source/Quality Score/Other Information Interpretation
General Flammable
CLP classification 2013 -
EC Risk Classification T - Toxic: R25
Xn - Harmful: R21
N - Dangerous for the environment: R50
EC Safety Classification S1/2, S23, S36/37, S45, S61
WHO Classification Ib - Highly hazardous
US EPA Classification (formulation) I - Danger - Highly toxic
UN Number 3018
Waste disposal & packaging -


TRANSLATIONS

for omethoate

Language Name
English omethoate
French omethoate
German Omethoat
Danish omethoate
Italian ometoato
Spanish ometoato
Greek -
Slovenian ometoat
Polish ometoat
Swedish -
Hungarian -
Dutch -

Record last updated: Wednesday 31 August 2011
Contact: aeru@herts.ac.uk