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Product Name: 2,2-Diphenyl-1-picrylhydrazyl
Synonyms: DPPH, DPPH free radical
Chemical Formula: C18H12N5O6
Molecular Weight: 394.33 g/mol
CAS Number: 1898-66-4
Recommended Use: Lab reagent, antioxidant research, free-radical indicator
Manufacturer/Supplier: Chemical supply companies provide this substance for laboratory purposes
Emergency Contact: Use local poison control hotline or company emergency number on product label
Classification: Acute toxicity (oral, dermal), eye irritation, specific target organ toxicity
Signal Word: Warning
Hazard Statements: Harmful if swallowed, may cause irritation to skin, eyes, and respiratory tract
Pictograms: Exclamation Mark
Potential Health Effects: Causes eye, skin, or respiratory irritation, headaches, nausea if inhaled or ingested in quantity
Precautionary Statements: Wash hands after handling, avoid breathing dust, avoid contact with skin or eyes, use in ventilated area
Component: 2,2-Diphenyl-1-picrylhydrazyl
Purity: >97% (common laboratory grade)
Impurities: Lower grade may contain minor organic residues
Chemical Family: Organic radical, hydrazyl derivative
Inhalation: Move to fresh air, provide oxygen if breathing difficult, get medical attention for continued symptoms
Skin Contact: Remove contaminated clothing, wash skin thoroughly with soap and water, get medical attention if irritation develops
Eye Contact: Flush eyes gently with water for at least 15 minutes, seek medical attention if redness or pain persists
Ingestion: Do not induce vomiting, rinse mouth, provide water to drink, seek immediate medical advice
Additional Information: Symptoms can include dizziness, headache, dermatitis; medical staff should show this MSDS
Suitable Extinguishing Media: Use water spray, alcohol-resistant foam, dry chemical, or carbon dioxide
Specific Hazards: Toxic fumes, oxides of nitrogen, carbon monoxide, and carbon dioxide may form under high temperature
Fire-Fighting Instructions: Wear full protective gear and self-contained breathing apparatus; avoid inhaling smoke/dust, keep containers cool
Explosion Hazards: Fine dust may form explosive mixtures with air; avoid accumulation of dust clouds
Personal Precautions: Ventilate area, avoid dust formation, wear protective gloves, clothing, and goggles
Methods for Cleanup: Sweep up without raising dust, place material in a suitable container for hazardous waste disposal, clean area with water after material pickup
Environmental Precautions: Prevent run-off into drains, waterways, or soil, notify authorities if large spill contaminates the environment
Safe Handling: Avoid contact with skin, eyes, and clothing, avoid inhalation of dust, use local exhaust ventilation
Hygiene Practices: Wash hands and any contacted skin thoroughly after handling, remove contaminated clothing and wash before reuse
Proper Storage: Store in tightly sealed containers away from direct sunlight, moisture, acids, and incompatible substances, keep at ambient temperature in dry, well-ventilated area
Incompatibilities: Strong acids, strong bases, and strong oxidizing agents
Engineering Controls: Laboratory fume hood, local exhaust ventilation
Personal Protective Equipment: NIOSH-approved dust mask or respirator, safety goggles with side shields, chemical-resistant gloves (nitrile or neoprene), lab coat or protective clothing
Exposure Limits: No established limits for DPPH; avoid excessive exposure
General Safety: Eyewash stations and safety showers should be accessible in work area
Appearance: Deep violet, crystalline powder
Odor: Odorless
Density: 1.404 g/cm3 (approximate)
Melting Point: 169-172 °C
Solubility: Soluble in ethanol, methanol, acetone, chloroform; insoluble in water
pH: Not applicable (not water soluble)
Vapor Pressure: Negligible at room temperature
Boiling Point: Decomposes
Flash Point: Not established, material not flammable under normal operation
Partition coefficient (log Pow): Not determined
Chemical Stability: Stable under recommended storage conditions
Decomposition Products: Nitrogen oxides, carbon monoxide, carbon dioxide on thermal decomposition
Incompatible Materials: Strong acids, bases, oxidizing agents
Hazardous Reactions: Improper storage or mixing with incompatible substances may cause hazardous decomposition
Polymerization: Does not undergo hazardous polymerization under normal conditions
Acute Toxicity: Harmful if swallowed; oral LD50 in mice reported as approximately 35 mg/kg
Inhalation: Dust irritates respiratory tract; symptoms may include sore throat, coughing
Skin and Eye Irritation: Prolonged or repeated contact can cause dermatitis; causes redness and tearing in eyes
Chronic Effects: No reliable data available on chronic effects or carcinogenicity for laboratory exposure levels
Sensitization: Not described in literature, but handle as a potential allergen for sensitive individuals
Ecotoxicity: Data lacking on specific species, product considered hazardous to aquatic organisms based on related compounds
Persistence and Degradability: No specific studies, structure suggests slow degradation in natural environments
Bioaccumulative Potential: Structure could promote bioaccumulation but no direct evidence in available studies
Mobility in Soil: Limited due to poor water solubility
Other Adverse Effects: Avoid release to the environment; disposal via proper hazardous waste channels helps prevent contamination
Disposal Method: Treat as hazardous waste, transfer in sealed containers to licensed chemical waste disposal facility
Contaminated Packaging: Contain residue, do not reuse empty containers; dispose through licensed waste contractor
Environmental Precautions: Do not pour down drains, avoid release to watercourses or soil, consult local regulations for detailed requirements
UN Number: Not classified under major transport codes
Shipping Name: Laboratory chemical, not regulated for ground, air, or sea
Transport Hazard Class: Non-hazardous under current international transport regulations
Packing Group: Not assigned
Special Precautions: Keep containers tightly closed, store upright on the transport, avoid excessive shock or heat
Labeling: Ensure all containers bear correct hazard labels and signal words
Chemical Inventory Status: Check compliance with chemical inventories including TSCA, REACH, DSL/NDSL
SARA Title III: Not listed under Sections 302, 313, or 311/312 for reportable quantities
California Proposition 65: Not listed
Other Requirements: Users in workplaces must train staff in chemical safety, maintain up-to-date MSDS and emergency plans, follow local and national rules for hazardous chemical management
