Product Identification

Product Name

4-(2,4-Dichlorophenoxy)butanoic acid

Synonyms

(2,4-Dichlorophenoxy)butyric acid
2,4-D butyric acid
2,4-DB
4-(2,4-Dichlorophenoxy)butanoic acid
Butirex
Embutone

CAS

94-82-6

Formula

C10H10Cl2O3

Molecular Weight

249.09

EINECS

202-366-9

RTECS

ES9100000

RTECS Class

Agricultural Chemical and Pesticide; Mutagen; Reproductive Effector

Merck

13,2855

Beilstein/Gmelin

1976809

Beilstein Reference

4-06-00-00927

EC Index Number

607-083-00-8

EC Class

Harmful; Dangerous for the Environment

Physical and Chemical Properties

Appearance

Colorless crystals.

Solubility in water

46 ppm at 25 C

Melting Point

118

Boiling Point

150 (0.2 torr)

Vapor Pressure

.000004

pKa/pKb

4.95 (pKa)

Partition Coefficient

3.53

Usage

Control of broad-leafed plants in row crops, defoliants, general brush control. Chlorophenoxy compounds, from table.

First Aid Measures

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 contaminated clothing and wash exposed area thoroughly with soap and water. A physician should examine the area if irritation or pain persists.

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.

Handling and Storage

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.

Hazards Identification

Ingestion

Nausea, vomiting, and diarrhea may be noted following ingestion.

Inhalation

Highly toxic, may be fatal if inhaled, swallowed or absorbed through skin. Effects of contact or inhalation may be delayed.

Skin

Cyanosis unresponsive to oxygen therapy may be noted in patients with methemoglobinemia due to absorption of excessive amounts of these agents.

Eyes

See Skin.

Hazards

Containers may explode when heated.

EC Risk Phrase

R 22 51/53

EC Safety Phrase

S 25 29 46 61

UN (DOT)

2765

Exposure Controls/Personal Protection

Personal Protection

Wear appropriate protective gloves, clothing and goggles.

Respirators

Wear positive pressure self-contained breathing apparatus (SCBA).

Poison Class

3

Fire Fighting Measures

Fire Fighting

Small Fires: Dry chemical, carbon dioxide or water spray. Large Fires: Water spray, fog or regular foam.

Fire Potential

Combustible material: may burn but does not ignite readily.

Accidental Release Measures

Small spills/leaks

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.

Stability and Reactivity

Stability

No data.

Combustion Products

Fire may produce irritating, corrosive and/or toxic gases.

Transport Information

UN Number

2765

Hazard Class

3.2