Clopyralid

  • 3,6-DCP
  • 3,6-Dichloropicolinic acid
  • 3,6-Dichloropyridine-2-carboxylic acid
  • Lontrel
  • 2-Pyridinecarboxylic acid, 3,6-dichloro
Formula
C6H3Cl2NO2
Structure
Description
White crystalline solid. Odorless.
Uses
Herbicide.

Registry Numbers and Inventories.
CAS
1702-17-6
EC (EINECS/ELINCS)
216-935-4
EC Index Number
607-231-00-1
EC Class
Irritant; Dangerous for the Environment
RTECS
TJ7550700
RTECS class
Agricultural Chemical and Pesticide; Reproductive Effector
UN (DOT)
1759
Merck
12,2462
Beilstein/Gmelin
473755
Beilstein Reference
5-22-02-00046
EPA OPP
117403
Swiss Giftliste 1
G-3688
Canada DSL/NDSL
NDSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed

Properties.
Formula
C6H3Cl2NO2
Formula mass
192
Melting point, °C
152 - 153
Boiling point, °C
308
Vapor pressure, mmHg
1E-5 (25 C)
Critical temperature
537
Critical pressure
45.3
Density
1.57 g/cm3 (20 C)
Solubility in water
Slightly soluble
pKa/pKb
2.3 (pKa)
Partition coefficient, pKow
1.07

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 goggles when handling concentrates.
Respirators
Wear positive pressure self-contained breathing apparatus (SCBA).
Small spills/leaks
ELIMINATE all ignition sources. Do not touch damaged containers or spilled material unless wearing appropriate protective clothing. Stop leak if you can do it without risk. Absorb or cover with dry earth, sand or other non-combustible material and transfer to containers. DO NOT GET WATER INSIDE CONTAINERS.
Stability
Stable in acidic media. Stable in UV irradiation. Storage Stability: Stable, excess of 2 yr.

Fire.
Fire fighting
Extinguish using agent most appropriate for surrounding fire.
Fire potential
Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes.
Hazards
Contact with metals may evolve flammable hydrogen gas.
Combustion products
Fire may produce irritating, corrosive and/or toxic gases.

Health.
Poison_Class
4
Exposure effects
   Ingestion
See Inhalation.
   Inhalation
Acute effects - Cough, sore throat. Irritates the eyes, skin and respiratory tract.
   Skin
Redness.
   Eyes
Redness, pain.

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 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
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.
UN number
1759
Response guide
Hazard class
8
Packing Group
I; II; III