Fonofos

  • O-Ethyl S-phenylethylphosphonodithioate
  • Fonophos
  • Dyphonate
Formula
C10H15OPS2
Structure
Description
Light-yellow liquid with a pungent mercaptan-like odor.
Uses
Dyfonate is soil insecticide useful in controlling soil insects such as corn rootworms (diabrotica species), wireworms (elateridae), garden symphylan (scutigerella immaculata), root maggots (hylemya species), crickets (gryllidae) & others.

Registry Numbers and Inventories.
CAS
944-22-9
EC (EINECS/ELINCS)
213-408-0
EC Index Number
015-091-00-2
EC Class
Very toxic; Dangerous for the Environment
RTECS
TA5950000
RTECS class
Agricultural Chemical and Pesticide; Mutagen
UN (DOT)
3018
Merck
12,4261
Beilstein/Gmelin
1958949
EPA OPP
41701
Swiss Giftliste 1
G-5091
Korea ECL
Listed

Properties.
Formula
C10H15OPS2
Formula mass
246.33
Melting point, °C
30
Boiling point, °C
324
Vapor pressure, mmHg
0.0005 (25 C)
Density
1.16 g/cm3 (20 C)
Solubility in water
10 mg/L
Refractive index
1.5883 (20 C)
Partition coefficient, pKow
3.94
Heat of vaporization
54.3

Hazards and Protection.
Storage
Stable under normal conditions.
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 compound is a liquid organophosphorus insecticide. 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 < 100 C hydrolyzed in acidic and alkaline media.
Incompatibilities
Keep away from substance is hydrolyzed in contact with strong acids and alkalis.
Decomposition
When heated to decomposition it emits very toxic fumes of phosphorus oxides and sulfur oxides.

Fire.
Flash Point,°C
94
Fire fighting
This compound is a liquid organophosphorus insecticide. 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. 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.Extinguish with dry chemical, carbon dioxide, water spray, fog, or foam.
Fire potential
Liquid formulations may be flammable if a flammable solvent is used. The solid may burn but is difficult to ignite.
Hazards
When this material is heated to decomposition, it can emit highly toxic fumes of phosphorus oxides.
Combustion products
Emits oxides of phosphorus fumes when burned.

Health.
Exposure limit(s)
TLV: ppm; 0.1 mg/m3 (as TWA) (skin) (ACGIH 1996). NIOSH REL: TWA 0.1 mg/m3 skin
Poison_Class
2
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. 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
3018
Response guide
Hazard class
6.1
Packing Group
I; II; III
 
USCG CHRIS Code
FNF