Methyl demeton

  • Methyl mercaptophos
  • Demeton Methyl
  • Phosphorothioic acid o-(2-(ethylthio)ethyl) O,O-dimethyl ester (O compound) mixed with s-(2-(ethylthio)-Ethyl) O,O-dimethyl phosphorothioate (S compound)
Formula
C6H15O3PS2
Structure
Description
Oily colorless to pale yellow liquid with an unpleasant odor.
Uses
This material is used as an insecticide, acaricide.

Registry Numbers and Inventories.
CAS
8022-00-2
RTECS
TG1760000
RTECS class
Agricultural Chemical and Pesticide; Reproductive Effector
UN (DOT)
3018
Merck
12,6129
Beilstein/Gmelin
8474286
EPA OPP
58701

Properties.
Formula
C6H15O3PS2
Formula mass
230.29
Boiling point, °C
89 (0.15 torr)
Vapor pressure, mmHg
0.0004
Density
1.20 g/cm3 (20 C)
Solubility in water
22 g/L
Refractive index
1.5063 (20 C)

Hazards and Protection.
Storage
Keep in well ventilated area
Handling
All chemicals should be considered hazardous. Avoid direct physical contact. Use appropriate, approved safety equipment. Untrained individuals should not handle this chemical or its container. Handling should occur in a chemical fume hood.
Protection
Protective clothing and gloves. Face shield or eye proteciton in combination with breathing protection.
Respirators
Wear positive pressure self-contained breathing apparatus (SCBA).
Small spills/leaks
If you should spill this chemical, use absorbent paper to pick up all liquid spill material. Seal the absorbent paper, as well as any of your clothing which may be contaminated, in a vapor-tight plastic bag for eventual disposal. Wash any surfaces you may have contaminated with a soap and water solution. Do not reenter the contaminated area until the Safety Officer (or other responsible person) has verified that the area has been properly cleaned.
Stability
Stable.

Fire.
Fire fighting
Fires involving this material can be controlled with a dry chemical, carbon dioxide or Halon extinguisher.
Fire potential
This material is probably combustible.
Hazards
Containers may explode when heated.
Combustion products
Fire may produce irritating, corrosive and/or toxic gases.

Health.
Exposure limit(s)
TLV: ppm; 0.5 mg/m3 (skin) (ACGIH 1989-1990). NIOSH REL: TWA 0.5 mg/m3 skin
Exposure effects
   Ingestion
Abdominal cramps, diarrhea, vomiting. See Inhalation.
   Inhalation
Acute effects - convulsion, dizziness, labored breathing, nausea, pupillary constriction, muscle cramps, excessive salibation, sweating, unconsciousness. May cause effects on the central nervous system. Cholinesterase inhibitor. Effects may be delayed.
   Skin
See inhalation. May be absorbed through the skin.
   Eyes
Pupillary constriction, blurred vision.

First aid
 
   Ingestion
CHOLINESTERASE INHIBITORS ARE EXTREMELY TOXIC AND FAST-ACTING POISONS. IMMEDIATELY call a hospital of poison control center and transport the victim to a hospital. Atropine is an antidote for cholinesterase inhibitors but should only be administered by properly trained personnel. In the absence of this option and if the victim is conscious and not convulsing, it may be worth considering the risk of inducing vomiting, even though the induction of vomiting is not usually recommended outside of a physician's care. Ipecac syrup or salt water may be used to induce vomiting in such an emergency. If the victim is convulsing or unconscious, do not give anything by mouth, assure that the victim's airway is open and lay the victim on his/her side with the head lower than the body. DO NOT INDUCE VOMITING. IMMEDIATELY transport the victim to a hospital.
   Inhalation
IMMEDIATELY leave the contaminated area; take deep breaths of fresh air. IMMEDIATELY call a physician and be prepared to transport the victim to a hospital even if no symptoms (such as wheezing, coughing, shortness of breath, or burning in the mouth, throat, or chest) develop. Provide proper respiratory protection to rescuers entering an unknown atmosphere. Whenever possible, Self-Contained Breathing Apparatus (SCBA) should be used.
   Skin
IMMEDIATELY flood affected skin with water while removing and isolating all contaminated clothing. Gently wash all affected skin areas thoroughly with soap and water. IMMEDIATELY call a hospital or poison control center even if no symptoms (such as redness or irritation) develop. IMMEDIATELY transport the victim to a hospital for treatment after washing the affected areas.
   Eyes
First check the victim for contact lenses and remove if present. Flush victim's eyes with water or normal saline solution for 20 to 30 minutes while simultaneously calling a hospital or poison control center. Do not put any ointments, oils, or medication in the victim's eyes without specific instructions from a physician. IMMEDIATELY transport the victim after flushing eyes to a hospital even if no symptoms (such as redness or irritation) develop.

Transport.
UN number
3018
Response guide
Hazard class
6.1
Packing Group
I; II; III