Demephion-S

  • Phosphorothioic acid, O,O-dimethyl S-(2-(methylthio)ethyl) ester
Formula
C5H13O3PS2
Structure
Description
A straw-colored liquid.
Uses
Insecticide.

Registry Numbers and Inventories.
CAS
2587-90-8
EC (EINECS/ELINCS)
219-971-9
EC Index Number
015-117-00-2
EC Class
Very toxic; Toxic
RTECS
TF9450000
RTECS class
Agricultural Chemical and Pesticide; Mutagen
Beilstein/Gmelin
1707090
Beilstein Reference
4-01-00-02460
EPA OPP
369200
Swiss Giftliste 1
G-185648

Properties.
Formula
C5H13O3PS2
Formula mass
216.27
Boiling point, °C
65 (0.1 torr)
Density
1.245 g/cm3 (20 C)

Hazards and Protection.
Storage
Keep in a cool, dry, dark location in a tightly sealed container or cylinder. Keep away from incompatible materials, ignition sources and untrained individuals. Secure and label area. Protect containers/cylinders from physical damage.
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
Chemical splash goggles in compliance with OSHA regulations are advised; however, OSHA regulations also permit other type safety glasses. Whre chemical resistant gloves. To prevent repeated or prolonged skin contact, wear impervious clothing and boots.
Respirators
Use NIOSH/MSHA approved respirator appropriate for exposure of concern.
Small spills/leaks
(Non-Specific -- Organophosphorus pesticide, liquid) Do not touch spilled material; stop leak if you can do so without risk. Use water spray to reduce vapors. Small spills: absorb with sand or other noncombustible absorbent material and place into containers for later disposal. Small dry spills: with clean shovel place material into clean, dry container and cover; move containers from spill area. Large spills: dike far ahead of spill for later disposal.
Stability
No data.
Incompatibilities
May react with strong reducing agents such as hydrides to give highly toxic and flammable phosphine gas.

Fire.
Fire fighting
(Non-Specific -- Organophosphorus pesticide, liquid, n.o.s.) Keep unnecessary people away; isolate hazard area and deny entry. Stay upwind; keep out of low areas. Ventilate closed spaces before entering them. Wear positive pressure breathing apparatus and special protective clothing. Remove and isolate contaminated clothing at the site.(Non-Specific -- Organophosphorus pesticide, liquid, n.o.s.) Small fires: dry chemical, carbon dioxide, water spray, or foam. Large fires: water spray, fog, or foam. Move container from fire area if you can do so without risk. Fight fire from maximum distance. Dike fire control water for later disposal; do not scatter the material.
Fire potential
This material may burn but does not ignite readily.

Health.
Poison_Class
1
Exposure effects
   Ingestion
See inhalation.
   Inhalation
(Non-specific -- Organophosphorus pesticide, liquid) May be fatal if inhaled, swallowed or absorbed through the skin. Contact may cause burns to skin and eyes. (Non-specific -- Organophosphate insecticide) May cause respiratory failure.
   Skin
See inhalation.
   Eyes
See inhalation

First aid
 
   Ingestion
Seek medical attention. If individual is drowsy or unconscious, do not give anything by mouth; place individual on the left side with the head down. Contact a physician, medical facility, or poison control center for advice about whether to induce vomiting. If possible, do not leave individual unattended.
   Inhalation
If symptoms develop, move individual away from exposure and into fresh air. If symptoms persist, seek medical attention. If breathing is difficult, administer oxygen. Keep person warm and quiet; seek immediate medical attention.
   Skin
Remove contaminated clothing. Wash exposed area with soap and water. If symptoms persist, seek medical attention. Launder clothing before reuse.
   Eyes
If symptoms develop, immediately move individual away from exposure and into fresh air. Flush eyes gently with water for at least 15 minutes while holding eyelids apart; seek immediate medical attention.

Transport.