Diazinon

  • Dimpylate
  • Basudin
  • Dianon
  • Spectracide
  • O,O-diethyl-o-(2-isopropyl-6-methylpyrimidin-4-yl)phosphorothioate
  • Phosphorothioic acid O,O-diethyl o-(6-methyl-2-(1-methylethyl)-4-pyrimidinyl) ester
Formula C12H21N2O3PS
Structure
Description Colorless liquid with a faint ester-like odor. Technical grade is pale to dark brown.
Uses This material is used as an insecticide, acaricide, bird repellent.

Registry Numbers and Inventories.
CAS 333-41-5
EC (EINECS/ELINCS) 206-373-8
EC Index Number 015-040-00-4
EC Class Harmful; Dangerous for the Environment
RTECS TF3325000
RTECS class Agricultural Chemical and Pesticide; Tumorigen; Mutagen; Reproductive Effector; Human Data; Primary Irritant
UN (DOT) 2783
Merck 12,3043
Beilstein/Gmelin 273790
Beilstein Reference 5-23-11-00187
EPA OPP 57801
Swiss Giftliste 1 G-1504
Canada DSL/NDSL DSL
US TSCA Listed
Austrailia AICS Listed
New Zealand Listed
Japan ENCS (MITI) Listed
Korea ECL Listed

Properties.
Formula C12H21N2O3PS
Formula mass 304.35
Boiling point, °C 306
Decomposition point, °C 120
Vapor pressure, mmHg 7.1E-5 (25 C)
Density 1.116 g/cm3 (20 C)
Solubility in water 40 mg/L
Surface tension 35 g/s2
Refractive index 1.4978 (20 C)
pKa/pKb 11.78 (pKb)
Partition coefficient, pKow 3.81
Heat of vaporization 57.5 kJ/mol
Heat of combustion -8400 kJ/mol

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 Wear appropriate protective gloves, clothing and goggles.
Respirators Wear positive pressure self-contained breathing apparatus (SCBA).
Small spills/leaks Stop discharge if possible. Keep people away. Isolate and remove discharged material. Notify local health and pollution control agencies.
Stability Stable.
Incompatibilities Incompatible with the following: Strong acids & alkalis, copper-containing compounds.
Decomposition When heated to decomposition it emits very toxic fumes of phosphorus oxides, sulfur oxides and nitrogen oxides.

Fire.
Flash Point,°C 82.2
Fire fighting SMALL FIRES: Dry chemical, carbon dioxide or water spray. LARGE FIRES: Water spray, fog or regular foam. Move containers from fire area if you can do it without risk. Dike fire control water for later disposal; do not scatter the material. Use water spray or fog; do not use straight streams. FIRE INVOLVING TANKS OR CAR/TRAILER LOADS: Fight fire from maximum distance or use unmanned hose holders or monitor nozzles. Do not get water inside containers. Cool containers with flooding quantities of water until well after fire is out. Withdraw immediately in case of rising sound from venting safety devices or discoloration of tank. ALWAYS stay away from tanks engulfed in fire. For massive fire, use unmanned hose holders or monitor nozzles; if this is impossible, withdraw from area and let fire burn.
Fire potential Nonflammable.
Hazards Containers may explode when heated.
Combustion products Fire may produce irritating, corrosive and/or toxic gases.

Health.
Exposure limit(s) TLV: ppm; 0.1 mg/m3 (as TWA) (skin) (ACGIH 1993-1994). NIOSH REL: TWA 0.1 mg/m3 skin
Poison_Class 3
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 Nausea, vomiting, abdominal cramps, and diarrhea are common muscarinic effects. Both painless and frank clinical pancreatitis have been reported.
   Inhalation Highly toxic, may be fatal if inhaled, swallowed or absorbed through skin. Effects of contact or inhalation may be delayed.
   Skin Profuse sweating is common. Pallor may be noted. Dermal sensitization has been reported.
   Eyes Constriction of the pupil, tearing, and blurred vision are common. Prolonged dialation of the pupils may occur. Salivation commonly occurs.

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 2783
Response guide 152
Hazard class 6.1
Packing Group I; II; III  
USCG CHRIS Code DZN