Chemical Name:

4-Amino-6-tert-butyl-3-(methylthio)-1,   2,4-triazin-5(4H)-one

Molecular Formula:

C₈H₁₄N₄OS

Molecular Weight:

214.32  

Specification:

95%TC /70%WP /70%WDG / 50% WP / 75%WDG  

Packing:

25kg/Fibre drum   1kg/aluminum bag, 500g/aluminum bag

CAS Number:

21087-64-9

Structure Formula:

Mode of action

Selective systemic herbicide, absorbed   predominantly by the roots, but also by the leaves, with translocation   acropetally in the xylem.

Usage:

Pre- and post-emergence control of a large number of   grasses and broad-leaf weeds in infesting agricultural crops, such as soya   beans, potatoes, tomatoes, sugar cane, alfalfa, asparagus, maize and cereals.

Toxicological Effects:

Acute toxicity: Metribuzin is slightly toxic via the   oral route, with reported oral LD50 values of 1090 to 2300 mg/kg in rats, 700   mg/kg in mice and 245 to 274 mg/kg in guinea pigs. It is practically nontoxic   dermaly, with a dermal LD50 of 20,000 mg/kg in rabbits [6,15]. The 4-hour   inhalation LC50 for metribuzin in rats is greater than 0.65 mg/L, indicating   moderate toxicity via the inhalation route [15]. Metribuzin has been shown   not to irritate the skin or eyes of rats, rabbits, guinea pigs, or human   volunteers. Effects of high acute exposure in metribuzin poisoned rats included narcosis (stupor) and labored breathing. Deaths occurred within 24 hours, and survivors recovered slowly without permanent effects.

Organ toxicity:

In single high dose studies, metribuzin appears to depress the central nervous   system. Other studies indicate that the target organs of metribuzin are the   thyroid gland and the liver.