Dicambia

  • 3,6-Dichloro-o-anisic acid
  • 3,6-Dichloro-2-methoxybenzoic acid
Formula
C8H6Cl2O3
Structure
Description
A white solid.
Uses
Selective pre- & postemergence herbicide, plant growth regulator.

Registry Numbers and Inventories.
CAS
1918-00-9
EC (EINECS/ELINCS)
217-635-6
EC Index Number
607-043-00-X
EC Class
Harmful; Irritant; Dangerous for the Environment
RTECS
DG7525000
RTECS class
Agricultural Chemical and Pesticide; Mutagen
UN (DOT)
2769
Merck
12,3090
Beilstein/Gmelin
2453039
EPA OPP
29801
Swiss Giftliste 1
G-1514
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C8H6Cl2O3
Formula mass
221.04
Melting point, °C
114-116
Boiling point, °C
329
Decomposition point, °C
200
Vapor pressure, mmHg
0.06 (25 C)
Vapor density (air=1)
1.57
Odor Threshold Odor threshold 250 ppm
Critical temperature
541
Critical pressure
34.1
Density
1.57 g/cm3 (25 C)
Solubility in water
7.9 g/L
pKa/pKb
1.87 (pKa)
Partition coefficient, pKow
2.21

Hazards and Protection.
Storage
Keep containers tightly closed in a well ventilated area away from food products. Keep away from heat and water. Store at in area away from seed fertilizers, insecticides or fungicides.
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 chemical protective gloves, boots and goggles.
Respirators
Wear positive pressure self-contained breathing apparatus (SCBA).
Small spills/leaks
Keep material out of water sources and sewers. Build dikes to contain flow as necessary. Land spill: Dig a pit, pond, lagoon, holding area to contain liquid or solid material. Cover solids with a plastic sheet to prevent dissolving in rain or fire fighting water. Water spill: If dissolved, in region of 10 ppm or greater concentration, apply activated carbon at ten times the spilled amount. Use mechanical dredges or lifts to remove immobilized masses of pollutants and precipitates.
Stability
It is resistant to oxidation and hydrolysis under normal conditions. Resistant to acid and strong alkali.
Incompatibilities
Reacts as a weak acid to neutralize bases, both organic (for example, the amines) and inorganic Reacts with cyanide salts in the presence of moisture to generate gaseous hydrogen cyanide May react if moist with sulfites, nitrites, thiosulfates (to give H2S and SO3), dithionites (SO2), to generate flammable and/or toxic gases and heat.

Fire.
Fire fighting
Extinguish fire using agent suitable for type of surrounding fire. (Material itself does not burn or burns with difficulty.)
Fire potential
Combustible solid.
Combustion products
Fire may produce irritating, corrosive and/or toxic gases.

Health.
Poison_Class
4
Exposure effects
Dicamba was shown not to be teratogenic in rabbits and rats tested. When tested in rats over 3 generations, no reduction in reproduction capacity was noted. <br>Lactating cows exposed to dicamba excreted about 0.02% in milk.
   Ingestion
Vomiting, anorexia, and weight loss have been reported with human exposure to the dimethylamine salt.
   Inhalation
Cyanosis and dyspnea were noted in experimental animals poisoned by dicamba.
   Skin
Dicamba is irritating to the skin. It was shown to be a moderate skin sensitizer in guinea pigs. When injected subcutaneously in animals, necrosis or fluid filled abscesses were noted.
   Eyes
See Inhalation.

First aid
 
   Ingestion
Induce vomiting.
   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
Wash with ample water.
   Eyes
Flush with water; obtain medical attention.

Transport.
UN number
2769
Response guide
Hazard class
6.1
USCG CHRIS Code
DIC
 
Std. Transport #
4963337