DEMETON-S-METHYL (ICSC)

DEMETON-S-METHYL	ICSC: 0705

Date of Peer Review: April 1997

S-2-Ethylthioethyl O,O-dimethyl phosphorothioate
Phosphorothioic acid, S-(2-(ethylthio)ethyl)O,O-dimethyl ester

CAS #

919-86-8

C₆H₁₅O₃PS₂ / (CH₃O)₂P(O)SCH₂CH₂SCH₂CH₃

RTECS #

TG1750000

Molecular mass: 230.3

UN #

3018

EC Index #

015-031-00-5

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.	Water spray, foam, powder, carbon dioxide.
EXPLOSION	Risk of fire and explosion if formulations contain flammable/explosive solvents.

EXPOSURE		PREVENT GENERATION OF MISTS! STRICT HYGIENE! AVOID EXPOSURE OF ADOLESCENTS AND CHILDREN!	IN ALL CASES CONSULT A DOCTOR!
Inhalation	Pupillary constriction, muscle cramp, excessive salivation. Sweating. Nausea. Vomiting. Abdominal cramps. Diarrhoea. Unconsciousness. Dizziness. Laboured breathing. Weakness.	Ventilation, local exhaust, or breathing protection.	Fresh air, rest. Refer for medical attention.
Skin	MAY BE ABSORBED! (Further see Inhalation).	Protective gloves. Protective clothing.	Remove contaminated clothes. Rinse and then wash skin with water and soap. Refer for medical attention.
Eyes	Pupillary constriction. Blurred vision.	Face shield or eye protection in combination with breathing protection.	First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then take to a doctor.
Ingestion	Convulsions. (Further see Inhalation).	Do not eat, drink, or smoke during work. Wash hands before eating.	Rinse mouth. Give a slurry of activated charcoal in water to drink. Induce vomiting (ONLY IN CONSCIOUS PERSONS!). Rest. Refer for medical attention.

SPILLAGE DISPOSAL

PACKAGING & LABELLING

Personal protection: chemical protection suit including self-contained breathing apparatus. Do NOT let this chemical enter the environment. Collect leaking and spilled liquid in sealable containers as far as possible. Absorb remaining liquid in sand or inert absorbent and remove to safe place. Do NOT wash away into sewer.

Do not transport with food and feedstuffs.
EU Classification
Symbol: T, N
R: 24/25-51/53
S: (1/2-)-28-36/37-45-61
UN Classification
UN Hazard Class: 6.1
UN Pack Group: II

EMERGENCY RESPONSE

STORAGE

Transport Emergency Card: TEC (R)-61GT6-II

Provision to contain effluent from fire extinguishing. Separated from food and feedstuffs. Keep in a well-ventilated room.

IPCS
International
Programme on
Chemical Safety

Prepared in the context of cooperation between the International Programme on Chemical Safety and the Commission of the European Communities Š IPCS, CEC 2005

SEE IMPORTANT INFORMATION ON BACK

DEMETON-S-METHYL

ICSC: 0705

IMPORTANT DATA

PHYSICAL STATE; APPEARANCE:
COLOURLESS TO PALE YELLOW OILY LIQUID, WITH CHARACTERISTIC ODOUR.

CHEMICAL DANGERS:
The substance decomposes on heating and on burning producing toxic fumes including phosphorus oxides, sulfur oxides.

OCCUPATIONAL EXPOSURE LIMITS:
TLV: 0.05 mg/mł as TWA; (skin); A4 (not classifiable as a human carcinogen); BEI issued; SEN; (ACGIH 2004).

ROUTES OF EXPOSURE:
The substance can be absorbed into the body by inhalation of its aerosol, through the skin and by ingestion.

INHALATION RISK:
A harmful contamination of the air will not or will only very slowly be reached on evaporation of this substance at 20°C; on spraying or dispersing, however, much faster.

EFFECTS OF SHORT-TERM EXPOSURE:
The substance may cause effects on the nervous system, resulting in convulsions, respiratory failure and death. Cholinesterase inhibitor. The effects may be delayed. Medical observation is indicated.

EFFECTS OF LONG-TERM OR REPEATED EXPOSURE:
Cholinesterase inhibitor; cumulative effect is possible: see acute hazards/symptoms.

PHYSICAL PROPERTIES

Boiling point at 0.13 kPa: 118°C
Relative density (water = 1): 1.2
Solubility in water, g/100 ml at 20°C: 0.33
Vapour pressure, Pa at 20°C: 0.048
Relative vapour density (air = 1): 7.9

Relative density of the vapour/air-mixture at 20°C (air = 1): 1.00
Octanol/water partition coefficient as log Pow: 1.32

ENVIRONMENTAL DATA

The substance is toxic to aquatic organisms. This substance may be hazardous to the environment; special attention should be given to honey bees, mammals, birds. This substance does enter the environment under normal use. Great care, however, should be given to avoid any additional release, e.g. through inappropriate disposal.

NOTES

Depending on the degree of exposure, periodic medical examination is suggested. 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 solvents also consult the ICSCs of these materials. Carrier solvents used in commercial formulations may change physical and toxicological properties. Do NOT take working clothes home. Azotox, Demetox, Duratox, Metasystox i, Metasystox 55, Mifatox, Persyst are trade names. Also consult ICSC 0429 (Demeton-O-methyl).
Card has been partly updated in October 2004 and 2005. See sections Occupational Exposure Limits, EU classification, Emergency Response.

ADDITIONAL INFORMATION

LEGAL NOTICE

Neither the CEC nor the IPCS nor any person acting on behalf of the CEC or the IPCS is responsible for the use which might be made of this information

Š IPCS, CEC 2005

    See Also:
       Toxicological Abbreviations
       Demeton-s-methyl (EHC 197, 1997)
       Demeton-s-methyl (PDS)
       Demeton-s-methyl (Pesticide residues in food: 1979 evaluations)
       Demeton-S-methyl (Pesticide residues in food: 1984 evaluations)