Metribuzin
Agrochemicals 2025-03-02
Metribuzin (CAS No. 21087-64-9)
1. Basic Information
- IUPAC Name: 4-Amino-6-(1,1-dimethylethyl)-3-(methylthio)-1,2,4-triazin-5(4H)-one
- Synonyms:
- Sencor® (Bayer trade name)
- Lexone® (DuPont trade name)
- CAS Number: 21087-64-9
- Molecular Formula: C₈H₁₄N₄OS
- Molecular Weight: 214.29 g/mol
- Appearance: White to off-white crystalline powder
- Odor: Slight sulfurous odor
2. Physical and Chemical Properties
| Property | Value |
|---|---|
| Melting Point | 125–126.5°C (257–260°F) |
| Vapor Pressure | 0.058 mPa (25°C) |
| Solubility (25°C) | – Water: 1,050 mg/L (pH 7) |
| – Acetone: 820 g/kg | |
| Log Pow | 1.65 (octanol/water) |
| Stability | Hydrolytically stable (pH 5–9) |
3. Chemical Structure
O
║
CH₃-S-C-NH
| ║
(CH₃)₃C-N=N
4. Hazards (GHS Classification)
- Acute Toxicity:
- Oral LD₅₀ (rat): 1,100–2,300 mg/kg (Category 4)
- Dermal LD₅₀ (rabbit): >20,000 mg/kg
- Environmental:
- Toxic to aquatic life (H411)
- Very toxic to terrestrial plants (H411)
- NFPA Rating: Health 2, Flammability 1, Reactivity 0
5. Storage and Handling
- Storage:
- Keep in original containers at <30°C
- Protect from moisture and direct sunlight
- Handling:
- Use chemical-resistant gloves (nitrile/Viton®)
- Avoid dust generation (use local exhaust)
6. Applications
- Herbicide:
- Selective control of broadleaf weeds in soybeans, potatoes, and cereals
- Applied pre- and post-emergence (0.25–1.0 kg a.i./ha)
- Mode of Action: Photosystem II inhibitor (triazine group)
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