Ethion

  • Phosphorodithioic acid,s,s'-methylene-o,o,o',o'-tetraethyl
  • Ethyl methylene phosphordithioate
  • O,O,O',O'-Tetraethyl s,S'-methylenediphosphorodithioate
  • Diethion
Formula
C9H22O4P2S4
Structure
Description
A wettable powder.
Uses
Insecticide, acaricide.

Registry Numbers and Inventories.
CAS
563-12-2
EC (EINECS/ELINCS)
209-242-3
EC Index Number
015-047-00-2
EC Class
Toxic; Harmful
RTECS
TE4550000
RTECS class
Agricultural Chemical and Pesticide; Mutagen; Human Data
UN (DOT)
2783
Merck
12,3782
Beilstein/Gmelin
1804530
Beilstein Reference
4-01-00-03093
EPA OPP
58401
Swiss Giftliste 1
G-1621
Austrailia AICS
Listed
New Zealand
Listed

Properties.
Formula
C9H22O4P2S4
Formula mass
384.48
Melting point, °C
13-12
Boiling point, °C
401
Vapor pressure, mmHg
3E-6 (25 C)
Vapor density (air=1)
13.26
Odor Threshold Odor threshold Pure-odorless.
Density
1.3121 g/cm3 (20 C)
Solubility in water
1 mg/L
Refractive index
1.543 (20 C)
Partition coefficient, pKow
5.073
Heat of vaporization
62.7 kJ/mol

Hazards and Protection.
Storage
Tightly closed containers. Keep away from heat and water, and food products. Do not store emulsifiable concentrate formulation 4 ec below 0 degrees F and formulation 8 ec below 20 degrees F.
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 gloves and clothing. Face shield or eye protection in combination with breathing portection.
Respirators
Wear positive pressure self-contained breathing apparatus (SCBA).
Small spills/leaks
Keep sparks, flames, and other sources of ignition away. Keep material out of water sources and sewers. Land spill: Dig a pit, pond, lagoon, holding area to contain liquid or solid material. Cover solids with a plastic sheet to prevent dissolving in rain or fire fighting water. Water spill: Use natural deep water pockets, excavated lagoons, or sand bag barriers to trap material at bottom. If dissolved, in region of 10 ppm or greater concentration, apply activated carbon at ten times the spilled amount. Use mechanical dredges or lifts to remove immobilized masses of pollutants and precipitates.
Stability
Containers may rupture under fire conditions.
Incompatibilities
Incompatible with alkaline preparations and formulating materials. Avoid contact with acids, alkalis.
Decomposition
Ethion tends to decompose rapidly with violence above 150 C.

Fire.
Flash Point,°C
176
Fire fighting
Extinguish fire using agent suitable for type of surrounding fire. (Material itself does not burn or burns with difficulty.) Use water in flooding quantities as fog. Use foam, dry chemical, or carbon dioxide.
Fire potential
Nonflammable.
Hazards
Shock can shatter the container, releasing the contents. Decomposes above 302F. When heated to decomposition it emits highly toxic fumes of oxides of sulfur and phosphorus. Hydrolyzed by acids and alkalies. Slowly oxidized in air.
Combustion products
Dangerous when heated to decomposition. Emits highly toxic fumes of oxides of sulfur and phosphorous.

Health.
Exposure limit(s)
TLV: ppm; 0.4 mg/m3 (as TWA) (skin) (ACGIH 1997). NIOSH REL: 0.4 mg/m3 skin
Poison_Class
2
Exposure effects
Reduced body temperature or elevated body temperature may occur. Low heart rate and abnormally low blood pressure may develop after moderate to severe poisoning. Rapid heart rate, elevated blood pressure, and changes in respiratory rate may also occur. Early giddiness, anxiety headache, and restlessness followed by ataxia, drowsiness, and confusion are common with moderate to severe exposures. Sporadic reports of human birth defects related to organophosphates have not been fully verified.
   Ingestion
Vomiting, hypersalivation, diarrhea, fecal incontinence and abdominal pain may occur.
   Inhalation
Dyspnea, rales, bronchorrhea, bronchospasm, or tachypnea may be noted. Noncardiogenic pulmonary edema may occur in severe cases. Chemical pneumonitis may be seen.
   Skin
Sweating is a consistent but not universal sign.
   Eyes
Constriction of the pupil, tearing, and blurred vision are common. Prolonged dialation of the pupils may occur in severe poisonings. Opsoclonus has been reported in one case. Salivation commonly occurs.

First aid
 
   Ingestion
Seek medical assistance.
   Inhalation
Move victim to fresh air. Apply artificial respiration if victim is not breathing. Do not use mouth-to-mouth method if victim ingested or inhaled the substance; induce artificial respiration with the aid of a pocket mask equipped with a one-way valve or other proper respiratory medical device. Administer oxygen if breathing is difficult.
   Skin
Remove and isolate contaminated clothing and shoes. Immediately flush with running water for at least 20 minutes. For minor skin contact, avoid spreading material on unaffected skin.
   Eyes
Immediately flush with running water for at least 20 minutes.

Transport.
UN number
2783
Response guide
Hazard class
6.1
Packing Group
I; II; III
 
USCG CHRIS Code
ETO
 
Std. Transport #
4921568