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Chemical Name: 1-(2-Pyridylazo)-2-naphthol
Common Synonyms: PAN, Pyridylazonaphthol
Formula: C15H11N3O
Appearance: Reddish-orange powder, distinct characteristic odor
Uses: Complexometric reagent, often showing up in analytical chemistry labs for detecting metal ions
Hazard Class: Not classified as hazardous under many global standards, but that shouldn’t lull anyone into carelessness
Main Risks: Eye irritation, mild skin irritation on direct contact, possible respiratory irritation when inhaled in powder form
Routes of Exposure: Inhalation of dust, skin or eye contact, accidental ingestion
Chronic Effects: Data on long-term exposure in humans remains thin; animal studies suggest caution
Precautionary Statements: Exposure controls always reduce risk, respect proper lab habits even if official hazard status seems low
Main Component: 1-(2-Pyridylazo)-2-naphthol typically makes up the entirety of material sold under this name
Impurities: Commercial batches may carry minor traces from synthesis such as residual solvents, but don’t expect significant contaminants
Concentration: Purity usually ranges 97-99.5% in reagent grade material, details should come from reputable supplier analyses
Eye Contact: Rinse carefully with lots of water, lift eyelids, seek medical attention for irritation or if discomfort lingers
Skin Contact: Wash with soap and water, remove contaminated clothing, persistent redness or rash may require physician advice
Inhalation: Get to fresh air, support breathing as needed, persistent cough or difficulty should lead to medical review
Ingestion: Rinse mouth, avoid inducing vomiting, medical support advised if significant quantity swallowed
Additional Advice: Always report exposure incidents within a lab to ensure ongoing safety for yourself and others
Extinguishing Media: Use dry chemical, CO2, or foam for small fires; water spray for larger events to cool containers
Fire Hazards: Organic compounds like PAN may decompose under fire into toxic gases including nitrogen oxides and carbon monoxide
Protection: Fire responders need self-contained breathing apparatus and full protective gear
Combustibility: Spend time securing sources of ignition in storage and handling zones to blunt fire risk
Spill Clean-Up: Sweep or scoop up solid product, avoiding clouding dusty residue into air
Personal Protection: Gloves, lab coat, dust mask, and good ventilation mean fewer regrets, especially where spills scatter
Environmental Consideration: Prevent direct entry into drains, running water, or soils, since even trace contaminants add up over time
Waste Collection: Store cleanup material in sealed containers labelled for chemical waste
Storage Conditions: Cool, dry, well-ventilated areas out of direct sunlight keep this powder in good shape and reduce accidental release
Handling: Minimize dust, avoid eating, drinking, or smoking in handling zones, train staff on local policies
Compatibility: Store away from oxidizers or acids to avoid unwanted reactivity
Long-Term Stability: Containers kept closed and away from excess heat help prevent decomposition or moisture uptake
Controls: Work under ventilated hoods for mixing and weighing; catch tiny particles before they become an inhalation concern
Personal Protective Equipment: Chemical-resistant gloves, eye protection, long sleeves or lab coat, optional dust mask for weighing large quantities
Exposure Limits: No explicit standards exist for this compound, but treat with the same caution as for similar aromatic azo compounds
Hygiene: Wash hands after handling, keep workspaces clean to cut down residue build-up
Appearance: Red to orange crystalline powder
Odor: Faint, chemical
Solubility: Low in water, more soluble in organic solvents like ethanol or acetone
Melting Point: 142-144°C reported in literature
Molecular Weight: 249.27 g/mol
Vapor Pressure: Negligible at room temperature
Other Notables: Light-sensitive, store in amber glass or opaque containers where practical
Chemical Stability: Stable under regular storage if moisture and light are kept away
Reactivity: Shows expected stability for an azo dye, but avoid strong oxidizing agents
Hazardous Decomposition: Burning releases toxic gases, pay special mind in case of fire or extreme heat
Polymerization: Not susceptible to hazardous polymerization
Keep Away From: Acids, oxidizers, and strong bases, storing with compatible materials keeps risk low
Acute Effects: Reports of significant acute oral, dermal, or inhalation toxicity remain rare; treat with respect as irritant all the same
Chronic Effects: Gaps in long-term study mean users should avoid exposure wherever possible
Carcinogenicity: No robust evidence in humans, but keep in mind that many structurally similar organic dyes carry concerns about mutagenicity
Other Concerns: Animal studies sometimes note kidney and liver impact with large doses, so routine lab exposure without controls poses a risk
Allergic Reactions: Sensitization has not been widely documented for PAN, but skin and airway irritation call for caution
Aquatic Toxicity: Environmental data lags far behind industrial use; best to treat as potentially toxic to aquatic life by analogy with other azo dyes
Persistence: Stable aromatic structure makes breakdown slow in soil and water, raising concern about accumulation
Bioaccumulation: No systematic studies—exercise caution for disposal, don’t assume harmlessness
Environmental Fate: Because azo bonds sometimes split into potentially harmful amines, spilled reagent never belongs down the sink
Methods: Gather waste in sealed, clearly labelled containers and deliver to certified hazardous waste handlers
Do Not: Pour down drain, flush into water systems, or dispose with general trash
Contaminated Packaging: Treat empty bottles or wrappers as chemical waste, never as regular plastic or paper recycling
Land Transport: Ship in sturdy, securely closed containers, protect from spills or leaks, independent packaging keeps accidental exposures at bay
Shipping Class: Typically not classified as dangerous for transport, but consult up-to-date dangerous goods lists, especially for bulk logistics
Handling Advice: Keep material upright, labeled, and shielded from extreme temperatures during shipping
GHS Classification: Not always classified as hazardous, but still requires honest assessment in local workplace safety plans
Labeling: Should include chemical identity and basic hazard language, even for non-hazardous status
Workplace Monitoring: Even absent formal exposure limits, prudent companies monitor air and surfaces for lingering contamination
Legislation: Check regional and national rules on dyes, laboratory chemicals, and environmental release—many places now press for more responsible handling and disposal, especially with concern over long-term, low-level exposure accumulating in the environment
