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Chemical Name: 1-Hydroxy-2-naphthoic Acid
Synonyms: β-Hydroxynaphthoic acid, 2-Carboxy-1-naphthol
Appearance: Pale yellow crystalline solid
Odor: Faint to odorless
Use Cases: Goes into dye stuffs, pigments, and sometimes as an intermediate in pharmaceutical production. This compound shows up across several labs, especially where synthetic dye chemistry takes place.
Acute Health Hazards: Skin and eye irritation pop up on first contact. Some folks experience respiratory irritation when dust hangs in the air.
Chronic Health Hazards: Prolonged exposure means more risks for the mucous membranes. There are no well-documented cancer risks from 1-hydroxy-2-naphthoic acid itself, but working with dyes means taking routine precautions.
Environmental Hazards: Not readily biodegradable, this chemical can damage aquatic ecosystems if flushed down the drain in significant amounts.
Main Component: 1-Hydroxy-2-naphthoic Acid, generally found at or above 99% purity in most laboratory settings.
Impurities: Trace naphthalene derivatives can be present, especially if the synthesis is not fully refined. Impurity profile depends on the production method.
Eye Contact: Rinse cautiously with water for several minutes. Keep eyelids open and remove contact lenses early. Persistent irritation means a trip to the medical provider.
Skin Contact: Strip off any contaminated clothing. Wash skin with soap under running water. Itching or blistering signals a need for professional care.
Inhalation: Get outside to fresh air quickly. If coughing, shortness of breath, or wheezing persists, seek attention.
Ingestion: Swallowing should be rare, but rinse mouth with water, avoid forcing vomiting, and see a healthcare professional if symptoms develop.
Symptoms to Watch: Redness, itching, cough, or signs of allergic response deserve close attention.
Suitable Extinguishing Media: Use carbon dioxide, dry chemical, or foam. Avoid direct water jet since runoff could spread the material.
Specific Hazards: Burning releases carbon oxides and possibly toxic fumes from incomplete combustion.
Protective Equipment: Wear self-contained breathing apparatus if you join the firefighting, along with heavy gloves and chemical-resistant boots.
Firefighting Advice: Stay upwind, cool neighboring containers with water spray, and avoid inhaling any smoke or vapor.
Personal Precautions: Respiratory protection, goggles, chemical-resistant gloves, and clothing stand out as must-haves. Avoid stirring up dust.
Environmental Precautions: Keep product away from drains and water sources. Never allow significant spills to hit the soil or stormwater.
Cleanup Methods: Sweep or scoop up residue while minimizing dust. Place solids into sealed containers for disposal. Clean area with damp towels, and bag used cleaning supplies for controlled disposal.
Handling: Use only in well-ventilated places. Avoid getting the powder on your skin or in your eyes. Bypass eating, smoking, or drinking until hands get washed. Always recap containers after use to reduce dust.
Storage: Store away from heat, open flame, and sunlight. Cool, dry, ventilated shelving inside locked cabinets works best. Keep containers tightly closed and avoid mixing with oxidizers or strong acids.
Engineering Controls: Laboratories handle this material in fume hoods or under extraction fans. General room air exchange keeps background exposures low.
Personal Protective Equipment: Chemical splash goggles, nitrile or neoprene gloves, and long-sleeved coats work well. N95 or higher respirators come out when airborne dust seems possible.
Hygiene Practices: Wash hands after use, remove contaminated gear before leaving the lab, and avoid touching face or mouth during handling.
Form: Crystalline solid
Color: Yellow to pale orange
Melting Point: Around 210–215°C
Solubility: Low in water, high in organic solvents like acetone
Odor: Minimal to none
Vapor Pressure: Negligible at room temperature
pH (aqueous solution): Slightly acidic
Chemical Stability: Stable at room temperature if dry. Prolonged exposure to high humidity can degrade the compound.
Incompatible Materials: Strong oxidizing agents, reducing agents, and concentrated acids
Hazardous Decomposition Products: Heating produces carbon dioxide, carbon monoxide, sometimes naphthalene-like byproducts.
Reactivity: Slow to react under ordinary storage and use, but avoid mixing with other reactive chemicals.
Acute Toxicity: Oral LD50 in rats is not widely reported, but general irritant effects on mucous membranes stand out.
Skin and Eye Effects: Causes redness, irritation, and possibly mild chemical burns if exposure lasts.
Inhalation Risks: Dust can irritate nose, throat, and lungs. Symptoms are reversible with removal from exposure.
Chronic Toxicity: There’s little evidence for long-term risks aside from ongoing irritation or sensitization.
Other Risks: No evidence for teratogenic or mutagenic effects at standard lab exposures.
Aquatic Toxicity: Not highly toxic to aquatic species, but chronic exposure can disrupt growth in sensitive organisms.
Persistence and Degradability: Slow to break down in soil and water. Tends to persist unless treated.
Bioaccumulation Potential: Not likely to accumulate significantly in food chains.
Other Environmental Concerns: Prevent large-scale release outside of controlled facilities.
Recommended Methods: Use a licensed hazardous waste handler for bulk amounts. Small amounts can sometimes go with organic solvent waste streams according to local law.
Avoid: Dumping into drains or standard trash.
Precautions: Seal in double bags or closed drums before handing over to disposal teams.
UN Number: Not classified as a hazardous transport material in most jurisdictions.
Shipping Name: Usually transported as laboratory chemicals with no special restrictions.
Precautions: Keep dry, away from incompatible chemicals, and handle packages to avoid punctures or spills.
Transport Conditions: Well-sealed, labeled, with access to spill supplies on hand.
Workplace Risk: Not usually flagged as a hazardous substance under most occupational health codes, but standard chemical hygiene plans apply.
Environmental Restrictions: Some countries require reporting if used or disposed of at large scale. Typical laboratory scale use is covered under general chemical regulations.
Labeling: Clear hazard symbols for irritant effects recommended for containers, and SDS information made available to handlers.
Other Notes: Best safety practice combines routine training, close tracking, and regular review of handling procedures. Institutions review local regulations for any updates in handling or disposal requirements.
