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DIMETHOATE
ICSC: 0741
Peer-Review Status: 26.03.1998 Validated
O,O-Dimethyl S-methylcarbamoylmethyl phosphorodithioate
Phosphorodithioic acid, O,O-dimethyl S-(2-(methylamino)-2-oxoethyl)ester
O,O-Dimethyl S-(2-(methylamino)-2-oxoethyl)phosphorodithioate 
CAS #: 60-51-5 RTECS #: TE1750000
UN #: 2783
EC #: 015-051-00-4
EINECS #: 200-480-3
    Formula: C5H12NO3PS2 / CH3NHCOCH2SPS(OCH3)2
Molecular mass: 229.2

TYPES OF
HAZARD /
EXPOSURE
ACUTE HAZARDS / SYMPTOMS      PREVENTION      FIRST AID / FIRE FIGHTING
FIRE Combustible. Liquid formulations containing organic solvents may be flammable. Gives off irritating or toxic fumes (or gases) in a fire.  NO open flames.  Use water spray, powder, carbon dioxide. 
EXPLOSION      
 
EXPOSURE   PREVENT DISPERSION OF DUST! AVOID EXPOSURE OF ADOLESCENTS AND CHILDREN!   
Inhalation Pupillary constriction, muscle cramp, excessive salivation. Sweating. Nausea. Dizziness. Laboured breathing. Weakness.  Use ventilation (not if powder).  Fresh air, rest. Artificial respiration may be needed. Refer for medical attention. 
Skin MAY BE ABSORBED! Further see Inhalation.  Protective gloves. Protective clothing.  Remove contaminated clothes. Rinse skin with plenty of water or shower. Refer for medical attention . 
Eyes Redness. Pain.  Wear safety goggles or face shield.  First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then refer for medical attention. 
Ingestion Abdominal cramps. Convulsions. Diarrhoea. Unconsciousness. Vomiting. Further see Inhalation.  Do not eat, drink, or smoke during work. Wash hands before eating.  Induce vomiting (ONLY IN CONSCIOUS PERSONS!). Rest. Refer for medical attention . 

SPILLAGE DISPOSAL
PACKAGING & LABELLING
Do NOT wash away into sewer. Sweep spilled substance into covered containers. If appropriate, moisten first to prevent dusting. Carefully collect remainder. Then store and dispose of according to local regulations. Personal protection: chemical protection suit including self-contained breathing apparatus.  Do not transport with food and feedstuffs.
Severe marine pollutant. 
EC Classification
Symbol: Xn; R: 21/22; S: (2)-36/37 
UN Classification
UN Hazard Class: 6.1; UN Pack Group: III 
GHS Classification
 

EMERGENCY RESPONSE SAFE STORAGE
Transport Emergency Card: TEC (R)-61G41C.  Provision to contain effluent from fire extinguishing. Separated from food and feedstuffs. Keep in a well-ventilated room. 

IMPORTANT DATA
Physical State; Appearance
PURE: COLOURLESS CRYSTALS WITH CHARACTERISTIC ODOUR. 

Physical dangers
 

Chemical dangers
Decomposes on heating. This produces toxic fumes including nitrogen oxides, phosphorus oxides and sulfur oxides. 

Occupational exposure limits
TLV (NOT-ESTABLISHED):. 

Routes of exposure
The substance can be absorbed into the body by inhalation, through the skin and by ingestion. 

Inhalation risk
Evaporation at 20°C is negligible; a harmful concentration of airborne particles can, however, be reached quickly. 

Effects of short-term exposure
The substance may cause effects on the nervous system at high levels. Cholinesterase inhibition. Exposure could cause death. The effects may be delayed. Medical observation is indicated. 

Effects of long-term or repeated exposure
Repeated or prolonged contact with skin may cause dermatitis. Cholinesterase inhibition. Cumulative effects are possible. See Acute Hazards/Symptoms. Animal tests show that this substance possibly causes toxic effects upon human reproduction. 


PHYSICAL PROPERTIES ENVIRONMENTAL DATA
Boiling point at 0.01kPa: 117°C
Melting point: 51-52°C
Density: 1.3 g/cm³
Solubility in water, g/100ml at 21°C: 2.5
Vapour pressure, Pa at 25°C: 0.001
Flash point: 107°C c.c.
Octanol/water partition coefficient as log Pow: 0.5/0.8  
The substance is toxic to aquatic organisms. This substance may be hazardous to the environment. Special attention should be given to bees and birds. Avoid release to the environment in circumstances different to normal use. 

NOTES
Other melting points: 43-45°C (technical grade).
Depending on the degree of exposure, periodic medical examination is indicated.
Specific treatment is necessary in case of poisoning with this substance; the appropriate means with instructions must be available.
If the substance is formulated with solvent(s) also consult the card(s) (ICSC) of the solvent(s).
Carrier solvents used in commercial formulations may change physical and toxicological properties.
Cygon, Fostion MM, Perfekthion, Rogor, and Roxion are trade names. 

ADDITIONAL INFORMATION
 

IPCS
International
Programme on
Chemical Safety
WHO ILO EC Prepared in the context of cooperation between the International Programme on Chemical Safety and the European Commission
© IPCS 2004-2012
LEGAL NOTICE Neither the EC nor the IPCS nor any person acting on behalf of the EC or the IPCS is responsible for the use which might be made of this information.


    See Also:
       Toxicological Abbreviations
       Dimethoate (EHC 90, 1989)
       Dimethoate (HSG 20, 1988)
       Dimethoate (FAO Meeting Report PL/1965/10/1)
       Dimethoate (FAO/PL:CP/15)
       Dimethoate (FAO/PL:1967/M/11/1)
       Dimethoate (JMPR Evaluations 2003 Part II Toxicological)
       Dimethoate (AGP:1970/M/12/1)
       Dimethoate (Pesticide residues in food: 1983 evaluations)
       Dimethoate (Pesticide residues in food: 1984 evaluations)
       Dimethoate (Pesticide residues in food: 1984 evaluations)
       Dimethoate (Pesticide residues in food: 1987 evaluations Part II Toxicology)
       Dimethoate (Pesticide residues in food: 1996 evaluations Part II Toxicological)