Terbufos

  • S-tert-Butylthiomethyl O,O-diethyl phosphorodithioate
  • S-(((1,1-Dimethylethyl)thio)methyl) O,O-diethyl phosphorodithioate
  • S-((1,1-Dimethylethyl)thio)methyl) O,O-diethyl phosporodithioate
Formula
C9H21O2PS3
Structure
Description
Technical product is a clear, colorless to pale yellow liquid.
Uses
Soil insecticide, nematicide.

Registry Numbers and Inventories.
CAS
13071-79-9
EC (EINECS/ELINCS)
235-963-8
EC Index Number
015-139-00-2
EC Class
Very toxic
RTECS
TD7200000
RTECS class
Agricultural Chemical and Pesticide
UN (DOT)
2783
Merck
12,9301
Beilstein/Gmelin
1710115
Beilstein Reference
4-01-00-03092
EPA OPP
105001
Austrailia AICS
Listed
New Zealand
Listed
Korea ECL
Listed

Properties.
Formula
C9H21O2PS3
Formula mass
288.44
Melting point, °C
-29
Boiling point, °C
320
Vapor pressure, mmHg
0.0006 (25 C)
Density
1.1125 g/cm3 (20 C)
Solubility in water
15 mg/L
Refractive index
1.5255 (20 C)
Partition coefficient, pKow
3.68
Heat of vaporization
53.9 kJ/mol

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
Wear appropriate protective gloves, clothing and goggles.
Respirators
Wear positive pressure self-contained breathing apparatus (SCBA).
Small spills/leaks
This is a liquid organophosphorus pesticide. Keep unnecessary people away; isolate hazard area and deny entry. Stay upwind; keep out of low areas. Ventilate closed spaces before entering them. Remove and isolate contaminated clothing at the site. 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. Large spills: dike far ahead of spill for later disposal.
Stability
Stable for at least two years at room temperature.

Fire.
Flash Point,°C
88
Fire fighting
This is a liquid organophosphorus pesticide. Wear positive pressure breathing apparatus and special protective clothing. 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.For small fires, use dry chemical, carbon dioxide, water spray, or foam. For large fires, use water spray, fog, or foam.
Fire potential
Moderate fire risk.
Hazards
This is a liquid organophosphorus pesticide. Hydrolyzes under alkaline conditions.
Combustion products
Fire may produce irritating, corrosive and/or toxic gases.

Health.
Exposure effects
Fever, low heart rate and abnormally low blood pressure, or rapid heart rate and elevated blood pressure may occur. Headache, dizziness, muscle spasms and profound weakness are common. Alterations of level of consciousness, anxiety, paralysis, seizures and coma may occur. Seizures may be more common in children.
   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. Remove material from skin immediately. 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
TBF