b-selektonon; u-5043; crotilin; decamine; dicopur; dicotox; ipaner; netagrone; pennamine; weedone-2,4-dp; helena 2,4-d

(2,4-dichlorophenoxy)acetic acid

C₈H₆Cl₂O₃

Form Colourless powder, with a slight phenolic odour.

Melting point 140.5℃.

Density 1.508 (20℃).

Solubility In water 311 (pH 1), 20 031 (pH 5), 23 180 (pH 7), 34 196 (pH 9) (all in mg/l, 25℃). In ethanol 1250, diethyl ether 243, heptane 1.1, toluene 6.7, xylene 5.8 (all in g/kg, 20℃); in octanol 120 g/l (25℃). Insoluble in petroleum oils. Mono-n-butylamine salt: In water 18 g/l (30℃).

Oral Acute oral LD50 for rats 639-764, mice 138 mg/kg.

Skin and eye Acute percutaneous LD50 for rats >1600, rabbits >2400 mg/kg.

Skin and eye irritant (rabbits). A skin sensitiser (guinea pigs). Inhalation LC50 (24 h) for rats >1.79 mg/l.

Post-emergence control of annual and perennial broad-leaved weeds in cereals, maize, sorghum, grassland, established turf, grass seed crops, orchards (pome fruit and stone fruit), cranberries, asparagus, sugar cane, rice, forestry, and on non-crop land (including areas adjacent to water). Control of broad-leaved aquatic weeds. The isopropyl ester can also be used as a plant growth regulator to prevent premature fruit fall in citrus fruit.

Description: White solid with a faint odour, free from visible extraneous matter;

Active Ingredient Content(w/w): ≥96%;

Loss on Drying(w/w): ≤1.5%;

Free Phenol Content (2.4-Dichloro phenol): ≤0.3%;

Triethanolamine Insoluble Material(w/w): ≤0.5%