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| CHEMICAL
NAME: |
2,4-dichlorophenoxyacetic
acid. |
| CAS NO.: |
94-11-1 (isopropyl ester); 94-75-7 |
| CLASS: |
Chlorinated phenoxy. |
| PROPERTIES: |
White powder. Melting point 140.5ˇăC. Vapor
pressure < 10-7 mbar. Acid not used customarily by
itself; usually as an amine, salt, or ester. Only slightly
soluble in petroleum distillate. Soluble in alcohols.
Esters are soluble in oils. Aqua-Kleen*: Gray to tan granules
with mild phenolic odor. |
| ACTION: |
Herbicide. |
| USE: |
For asparagus, cereal grains, corn, grasses,
hay, rice, sorghum, soybeans (preplant),
sugarcane, fallow land, pasture, rangeland, turf, and
noncrop areas for control of annual mustard, Canada thistle,
dandelion, lambsquarters, ragweed, etc. Many broadleaf
crops (cotton, grapevines) are extremely sensitive. Aqua-Kleen*
for control of aquatic weeds in lakes and ponds. Citrus
Fix* in lemon packinghouses to keep buttons alive and
healthy; prevents preharvest drop of mature citrus. |
| FORMULATIONS: |
Emulsion form (esters),
aqueous solution (salts), emulsifiable concentrate, wettable
powder. The amine in largest production is the dimethylamine
salt, others being the diethanolamine, trimethylamine,
etc. As with amines which form salts with the 2,4-D acid,
esters are made with a wide variety of alcohols. |
| SOLUBILITY (IN WATER): |
Slightly soluble. Amine salts are soluble
in water; isopropyl
ester is insoluble. Esters are essentially insoluble,
but available formulations are usually emulsifiable. |
| TOXICITY: |
(Rat): Oral LD50 699
mg/kg. Isopropyl: 700 mg/kg. Sodium Salt: 500-805 mg/kg.
Dimethylamine salt: 949 mg/kg. Isooctyl ester: 896 mg/kg.
Usual application
rates have no adverse effect on soil microorganisms. |
| TOXICITY CLASS: |
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| HANDLING/STORAGE
CAUTIONS: |
Handle carefully. Do
not contaminate water, food, or feed by product storage
or disposal. Do not store near food, feed, fertilizers,
seeds, insecticides, or fungicides. Do not use spray equipment
contaminated with this product for any other purposes
unless thoroughly cleaned with a suitable cleaner. The
greatest danger to susceptible crops is spray drift and
volatilization. Highly volatile esters
may result in vapor damage to such crops, while low volatile
esters such as butoxyethyland isooctyl esters are less
likely to cause damage, and salt formations are essentially
non-volatile. Do not apply where irrigation water may
be contaminated. Citrus
Fix* may crystallize if stored at cold temperatures; if
this occurs, call Amvac Chemical Corp. before using. Store
in closed, original container in secure, dry, temperate
area. Avoid contact with water. |
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