ACETOCHLOR

Common name: Acetochlor

Chemical name: 2-chloro- N -(ethoxymethyl)- N -(2-ethyl-6-methylphenyl)acetamide

Structural formula:

Chemical class: Anilide herbicide

CAS No.: 34256-82-1

Properties: Technical product is yellow to purple transparent liquid; M.p. ﹤ 0 ℃ ; B.p. 162 ℃ / 7 mmHg; V.p. 4.5 × 10 -3 mPa (25 ℃ ); Soluble in water 223mg/L (25 ℃ ). Soluble in diethyl ether, acetone, benzene, chloroform, ethanol, ethyl acetate, and toluene; Stable for over 2 years at 20 ℃ . F.p. ﹥ 100 ℃ (Tag closed up).

Toxicity: Acute oral LD 50 for rats 2148mg/kg. Acute percutaneous LD 50 for rabbits 4166 mg/kg. Contact sensitization reactions observed in guinea pigs. Practically non-irritating to eyes and skin (rabbits). Inhalational LC 50 (4 h) for rats ﹥ 3.0 mg/L air.

Ecotoxicology: Birds, acute oral LD 50 for bobwhite quail 1260 mg/kg. LC 50 (5 d) for quail and mallard ducks ﹥ 5620 mg/kg. Fish, LC 50 (96 h) for rainbow trout 0.45, bluegill sunfish 1.3 mg/L. Bees, LD 50 (96 h) 1.715 mg/bee. Daphnia, LC 50 (48 h) 16 mg/L.

Environmental fate: Animals, the primary routes of metabolism are glutathione conjugation and metabolism by cytochrome P450. Plants, in maize and soya beans, rapidly absorbed and metabolized in the germinating plant. In maize, the first metabolite is glutathione, and in soya beans homoglutathione. Soil/Environment, strongly absorbed by soil, with little leaching. Microbial degradation accounts for most loss from soil; DT 50 8-18 d.

Treatment: Varies by formulation. Get medical aid. Eyes, rinse with abundant amount of water for at least 15 minutes; Skin, wash thoroughly with soap, water; Inhalation, relocate to fresh air; Ingestion, do NOT induce vomiting. Never give anything by mouth to an unconscious person.

Mode of action: Selective herbicide, absorbed mainly by the shoots of germinating plants.

Usage: Used pre-emergence or pre-plant to control annual grasses, certain annual broad-leaved weeds and yellow nutsedge in maize, peanuts, soya beans, cotton, potatoes and sugar cane. It is absorbed mainly by the shoots and secondarily by the roots of germinating plants.