Metribuzine;4-amino-6-(1,1-dimethylethyl)-3-(methylthio)-1,2,4-triazin-5(4H)-one

4-amino-6-tert-butyl-4,5-dihydro-3-methylthio-1,2,4-triazin-5-one

C₈H₁₄N₄OS

Form White crystals, with a weak characteristic odour.

Melting point 126.2℃. Density 1.13 (20℃).

Solubility In water 1.05 g/l (20℃).

In dimethylformamide 1780, cyclohexanone 1000, chloroform 850, acetone 820, methanol 450, dichloromethane 333, benzene 220, n-butanol 150, ethanol 190, toluene 87, xylene 90, isopropanol 77, hexane 0.1-1.0 (all in g/l, 20℃).

Oral Acute oral LD50 for male rats 510, female rats 322, mice c. 700, guinea pigs 250, cats >500,mg/kg.

Skin and eye Acute percutaneous LD50 for rats >20 000 mg/kg.

Not irritating to skin and eyes (rabbits).

Inhalation LC50 (4 h) for rats >0.65 mg/l air (dust).

Pre- and post-emergence control of many grasses and broad-leaved weeds in soya beans, potatoes, tomatoes, sugar cane, alfalfa, asparagus, maize and cereals.

Description: Yellowish to white powder, free from visible extraneous matter;

Active Ingredient Content (w/w): ≥95%;

Water (w/w): ≤1.0%;

Acidity (as H₂SO₄) (w/w): ≤0.5%;

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