Pendimethalin

  • Dirimal
  • AC 92553
  • Southern Weed Grass Control
  • N-(1-Ethylpropyl)-3,4-dimethyl-2,6-dinitroaniline
  • N-(1-Ethylpropyl)-3,4-dimethyl-2,6-dinitrobenzenamine
  • N-(1-Ethylpropyl)2,6-dinitro-3,4-xylidine
Formula
C13H19N3O4
Structure
Description
Orange-yellow crystals.
Uses
Selective herbicide. Preemergence or postemergence in field corn, preemergence or postemergence incorporated use in potatoes, early postemergence use in rice, postemergence incorporated use in sorghum and preplant incorporated use in cotton, soybeans, tobacco, peanuts and sunflowers, controls most annual grasses and certain broadleaf weeds.

Registry Numbers and Inventories.
CAS
40487-42-1
EC (EINECS/ELINCS)
254-938-2
EC Index Number
609-042-00-X
EC Class
Sensitising; Dangerous for the Environment
RTECS
BX5470000
RTECS class
Agricultural Chemical and Pesticide; Tumorigen
Merck
12,7211
Beilstein/Gmelin
2157711
EPA OPP
454300
Swiss Giftliste 1
G-5407
Austrailia AICS
Listed
New Zealand
Listed
Korea ECL
Listed

Properties.
Formula
C13H19N3O4
Formula mass
281.31
Melting point, °C
56 - 57
Boiling point, °C
421
Vapor pressure, mmHg
3E-7 (25 C)
Density
1.19 g/cm3 (25 C)
Solubility in water
Insoluble
Partition coefficient, pKow
5.56
Heat of vaporization
67.5 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
Goggles or face shield and rubber gloves.
Respirators
Use NIOSH/MSHA approved respirator appropriate for exposure of concern.
Small spills/leaks
Evacuate area and ventilate. Wear protective equipment. If required, use an inert absrobent. Sweep up and place in an appropriate container for disposal. Wash contaminated surfaces.
Stability
Very stable in storage. Stable to acids and alkalis. Slowly decomposed by light.
Incompatibilities
Strong oxidizing agents.

Fire.
Flash Point,°C
208
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. Use agent most appropriate to extinguish fire.

Health.
Poison_Class
4
Exposure effects
The toxicological properties of this material have not been investigated.

First aid
 
   Ingestion
The possible benefit of early removal of some ingested material by cautious gastric lavage must be weighed against potential complications of bleeding or perforation. Activated charcoal activated charcoal binds most toxic agents and can decrease their systemic absorption if administered soon after ingestion. Activated charcoal: administer charcoal as a slurry (240 ml water/30 g charcoal). Usual dose: 25 to 100 g in adults/adolescents.
   Inhalation
Move patient to fresh air. Monitor for respiratory distress. If cough or difficulty breathing develops, evaluate for respiratory tract irritation, bronchitis, or pneumonitis. Administer oxygen and assist ventilation as required. Treat bronchospasm with beta2 agonist and corticosteroid aerosols.
   Skin
Remove contaminated clothing. Wash exposed area with soap and water. If symptoms persist, seek medical attention. Launder clothing before reuse.
   Eyes
Irrigate exposed eyes with copious amounts of tepid water for at least 15 minutes. If irritation, pain, swelling, lacrimation, or photophobia persist, the patient should be seen in a health care facility.

Transport.