Agrochemicals

Maleic hydrazide

Agrochemicals 2025-03-02

Maleic Hydrazide (CAS No. 123-33-1)

1. Basic Information

Chemical Name: Maleic hydrazide
Synonyms: 1,2-Dihydropyridazine-3,6-dione; MH
CAS Number: 123-33-1
Molecular Formula: C₄H₄N₂O₂
Molecular Weight: 112.09 g/mol
Appearance: White crystalline powder
Odor: Odorless

2. Physical and Chemical Properties

Property	Value
Melting Point	260–265°C (decomposes)
Solubility	– Water: 6 g/L (25°C)
	– Organic solvents: Insoluble in most (e.g., ethanol, acetone)
pH (1% solution)	5.5–7.0
Vapor Pressure	Negligible (<0.1 mPa at 20°C)
Stability	Stable under normal conditions

3. Chemical Structure

       O  
      ║  
   N---C  
  //   \\  
 N     C=O  
  \\   //  
   C---C  
      ║  
      O

4. Hazards (GHS Classification)

Acute Toxicity:
- Oral LD₅₀ (rat): >5,000 mg/kg (Category 5)
- Dermal LD₅₀ (rabbit): >2,000 mg/kg
Environmental:
- Not classified as hazardous (EC₅₀ >100 mg/L for aquatic organisms)
NFPA Rating: Health 1, Flammability 0, Reactivity 0

5. Storage and Handling

Storage:
- Keep in tightly closed containers at room temperature
- Protect from moisture and direct sunlight
Handling:
- Use standard lab PPE (gloves, goggles)
- Avoid dust formation

6. Applications

Plant Growth Regulator:
- Inhibits sprouting in potatoes, onions, and tobacco
- Applied at 10–50 ppm in agriculture
Herbicide: Controls grasses and weeds in non-crop areas
Research: Used to study cell division inhibition in plants

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