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Chemical Name: 2-Mercaptopropionic Acid
Synonyms: Thiolactic acid
CAS Number: 79-42-5
Molecular Formula: C3H6O2S
Physical State: Liquid, sharp odor
Uses: Found in labs as a chelating agent; used in pharmaceuticals and as an intermediate for various syntheses.
Hazard Statements: Corrosive to skin and eyes, inhalation can cause irritation in respiratory tract. Prolonged exposure often brings headaches and dizziness.
GHS Classification: Skin Corrosive, Acute Toxicity (Oral), Acute Toxicity (Inhalation)
Symbol: Exclamation mark, corrosive pictogram
Routes of Entry: Skin contact, eye contact, inhalation, ingestion
Most Serious Effects: Immediate tissue damage if spilled on skin, high risk of eye injury, especially for those careless about PPE.
Chemical Identity: 2-Mercaptopropionic Acid
Concentration: Typically used in near-pure form above 95% in industrial settings.
Impurities: Rarely any, but leftover bit of acrylic acid or propionic acid possible if synthetic process isn’t watched closely.
Inhalation: Move away from the source, seek fresh air immediately. Unchecked, inhalation of vapors causes sore throat, sneezing, shortness of breath.
Skin Contact: Remove contaminated clothing, wash with lots of water using a safety shower, always keep eyes wide for signs of burns or redness.
Eye Contact: Rinse eyes for at least 15 minutes, let water flush away the chemical, get medical help quickly.
Ingestion: Rinse mouth, avoid vomiting, rush to medical support—lucky break if only a small amount swallowed, high doses mean quick professional intervention.
Suitable Extinguishing Media: Carbon dioxide, dry chemical powder, alcohol-resistant foam work best in a pinch.
Unusual Fire Hazards: Pungent sulfur dioxide fumes gush out if it fires up, eyes and airways sting even after small fires.
Protective Equipment: Self-contained breathing apparatus and chemical-protective clothing, firefighters need to know the risk of toxic gases.
Decomposition Products: Releases sulfur oxides, carbon oxides, choking fumes.
Personal Precautions: Protective gloves, goggles, solid ventilation top the priority list for anyone cleaning up so accidents don’t trigger larger health crises.
Environmental Precautions: Every drop should stay out of drains or waterways—no one wants contaminated ecosystems spiraling on their watch.
Cleanup Methods: Absorb liquid in sand or inert absorbent, sweep into sealable containers, hustle it out for safe disposal.
Safe Handling: Wear chemical-resistant gloves, good lab coats; avoid splashes, don’t gamble with bare skin. Care with decanting and pipetting goes far.
Ventilation: Fume hoods, not just regular fans, box in the fumes—sulfurous compounds cling and linger.
Storage Conditions: Keep tightly sealed in cool, dry, well-ventilated storage, shielded from acids, bases, oxidizers.
Incompatible Materials: Strong oxidizers, metals—nobody likes surprise exothermic reactions.
Exposure Limits: No clear OSHA or ACGIH thresholds, but prudent practice means treating exposure like a threat even at low levels.
Engineering Controls: Fume hoods, local exhaust ventilation, constant airflow to pull vapors far from breathing zones.
Personal Protective Equipment: Chemical-splash goggles, impervious gloves (nitrile, butyl, or neoprene), sturdy lab coats, closed shoes, face shield for handling larger volumes.
Hygiene: Never touch face, eat, or drink in the workspace; thorough handwashing rounds out any lab session.
Appearance: Clear to pale yellow liquid, thick and oily, catches nostrils with a rotten egg, sulfur odor.
Boiling Point: Around 190-195°C
Melting Point: Roughly -20°C
Density: About 1.21 g/cm3 at 20°C
Solubility: Fully miscible in water, alcohols.
Vapor Pressure: Low but not negligible, some escapes into the air at room temperature.
Chemical Stability: Stable under recommended handling; neglect the rules, it goes sideways in the presence of strong oxidizers.
Conditions to Avoid: Heat, sunlight, moisture bump up volatility and corrosion.
Hazardous Reactions: Reacts with metals, strong acids, peroxides—brings risks most only realize after the fact.
Decomposition: Churning out nasty gases—hydrogen sulfide, sulfur dioxide—when broken down.
Acute Toxicity: Toxic by ingestion, inhalation, and skin; rodents studies show low-to-moderate oral toxicity.
Skin and Eye Contact: Burns, ulceration, skin turns red and blisters, eyes especially vulnerable.
Chronic Effects: Long exposures set up for dermatitis or airway damage.
Sensitization: High potential for causing allergic skin reactions after repeated exposure.
Aquatic Toxicity: Harms aquatic life—fish struggle, invertibrates wilt fast in contaminated water.
Persistence and Degradability: Breaks down in soil and water but too slowly to risk careless releases.
Bioaccumulation: Low estimated risk of build-up in food chains, but it’s always best to keep it out of natural habitats.
Mobility: Moves quickly through water, so spills spread fast in waterways.
Waste Handling: Treat as hazardous waste, send only to approved chemical waste disposal centers, never mix with regular trash or pour down drains.
Container Disposal: Empty containers should be triple-rinsed and processed for hazardous recycling.
Incineration: Proper incineration under controlled temperature and scrubbers to catch sulfur vapor is a must.
UN Number: UN 3265
Transport Hazard Class: 8 (Corrosive substances)
Packing Group: II (Medium danger)
Shipping: Always in tightly sealed, corrosion-resistant drums, labeled clearly for corrosive content, never near food or personal items.
Special Precautions: Emergency response information pinned with shipment, handlers trained, vehicles ventilated and sheltered from heat.
Labeling: GHS signal word “Danger,” hazard statements set firmly on every bottle.
Regulations: Covered under chemical safety acts in many countries; workplace safety laws require proper control measures.
Notification: Reporting spills or environmental releases mandatory in most regions for this chemical.
Worker Protections: Training must emphasize personal safety, rigorous labeling, secure storage, and quick response measures.
