- 2-(2,4-Dichlorophenoxy)propionic acid
Yellowish to colorless solid.
Herbicide, plant growth regulator.
Registry Numbers and Inventories.
EC Index Number
R 21/22 38 41
S 26 36/37
Agricultural Chemical and Pesticide; Tumorigen; Mutagen; Reproductive Effector
Swiss Giftliste 1
Melting point, °C
117 - 118
Boiling point, °C
1.42 g/cm3 (20 C)
Solubility in water
Partition coefficient, pKow
Hazards and Protection.
If stored below freezing, it may be necessary to warm to 40F and agitate before using.
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.
Goggles, long-sleeved shirt and pants.
Wear positive pressure self-contained breathing apparatus (SCBA).
Do not touch damaged containers or spilled material unless wearing appropriate protective clothing. Stop leak if you can do it without risk. Cover with plastic sheet to prevent spreading. Absorb or cover with dry earth, sand or other non-combustible material and transfer to containers. DO NOT GET WATER INSIDE CONTAINERS.
Stable to heat, and resistant to reduction, hydrolysis and atmospheric oxidation. The acid is very stable, and forms sparingly-soluble, slightly-active salts withheavy metals. The esters are hydrolyzed on warming with acids or alkalis.
When heated to decomposition it emits toxic fumes of hydrogen chloride.
Small Fires: Dry chemical, carbon dioxide or water spray. Large Fires: Water spray, fog or regular foam.
Combustible material: may burn but does not ignite readily.
Containers may explode when heated.
Fire may produce irritating, corrosive and/or toxic gases.
Low dose exposures - vertigo, headache, malaise, and paresthesias may occur depending on the specific compound involved. High dose exposures - muscle twitching, spasms, profound weakness, polyneuritis, and unconsciousness may occur depending on the specific compound involved. Idiosyncratic reactions - peripheral neuropathies 2,4-D and 2,4,5-T have caused adverse reproductive effects in experimental animals. Allegations of human birth defects due to these compounds have not been confirmed.
Nausea, vomiting, and diarrhea have been reported. Necrosis of the gastrointestinal mucosa has been reported.
Ingestion of large amounts may cause bradypnea, respiratory failure, hyperventilation, or pulmonary edema.
Direct contact may cause skin irritation. Chlorodioxin contamination of products may produce chloracne with heavy exposure.
Eye, nose, and mouth irritation are possible with direct contact.
Seek medical assistance.
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.
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.
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.