Agrochemicals

2,4-Dichlorophenoxyacetic Acid Sodium Salt (CAS No. 2702-72-9) 

1. Basic Information

• Chemical Name: Sodium 2,4-dichlorophenoxyacetate
• Synonyms: 2,4-D sodium salt; Sodium 2,4-D
• CAS Number: 2702-72-9
• Molecular Formula: C₈H₅Cl₂NaO₃
• Molecular Weight: 243.02 g/mol
• Appearance: White to tan crystalline powder
• Odor: Odorless

2. Physical and Chemical Properties

Property	Value/Description
Melting Point	215–218°C (dec.)
Solubility	– Water: ~600 g/L (20°C)
	– Organic solvents: Low solubility
pH (1% solution)	7.0–9.0
Density	1.48 g/cm³
Vapor Pressure	Negligible

3. Hazards (GHS Classification)

• Acute Toxicity: Harmful if swallowed (H302)
• Eye Irritation: Causes serious eye irritation (H319)
• Environmental Hazards:
  • Very toxic to aquatic life (H400)
  • Persistent in soil (H412)
• NFPA Rating: Health 2, Flammability 1, Reactivity 0

4. Storage and Handling

• Storage:
  • Tightly sealed in corrosion-resistant containers
  • Store in cool, dry place away from acids
• Handling:
  • Use nitrile gloves and safety goggles
  • Avoid dust generation

5. Applications

• Herbicide: Selective weed control in agriculture
• Plant Growth Regulator: Stimulates fruit development
• Research: Auxin analog in plant physiology studies

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