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Product Name: Nitrosylsulfuric Acid
Chemical Formula: NOHSO4
Other Names: Nitrosulfuric Acid, Nitrosulphuric Acid
Manufacturer/Supplier: Major chemical suppliers, distributed globally by specialist chemical providers
Recommended Use: Laboratory reagent, used in explosive manufacture, nitro compound synthesis
Contact Information: Provided by supplier on their shipping documents
CAS Number: 7782-78-7
Emergency Contact: Chemtrec or local Poison Control, numbers supplied with shipment paperwork
GHS Classification: Corrosive to metals, acute toxicity (oral, dermal, inhalation), severe skin burns and eye damage, environmental hazard for aquatic life
Hazard Statements: Causes severe skin burns and eye damage. Harmful if inhaled, ingested or absorbed through the skin. Reacts violently with water. Toxic gas emission risk.
Signal Word: Danger
Pictograms: Corrosive, Skull and Crossbones, Environment
Precautionary Statements: Use only outdoors or in a well-ventilated area. Wear acid-resistant gloves, protective clothing, face shield with goggles. Avoid all contact. Store under dry, tightly-closed conditions.
Chemical: Nitrosylsulfuric Acid (NOHSO4)
Concentration: Typically ranges from 60% to 70% active equivalent by weight
Impurities: Small amounts of sulfuric acid, dissolved nitrogen oxides, possibly traces of water depending on storage
Synonyms: Nitrosulfuric Acid, Oxyamino sulfuric acid
Inhalation: Move to fresh air. Oxygen or artificial respiration as needed. Immediate medical attention due to risk from nitrogen oxide gassing.
Skin Contact: Remove all contaminated clothing. Flood affected area with copious amounts of running water for at least 20 minutes. Do not attempt neutralization on the skin at the scene. Medical evaluation required.
Eye Contact: Immediate and prolonged irrigation with water or sterile saline for at least 30 minutes, lifting eyelids. Immediate emergency ophthalmology consult.
Ingestion: Do not induce vomiting. Rinse mouth thoroughly. Give water if conscious. Hospital emergency care required.
Advice for Physician: Treat as strong acid burn with risks of secondary systemic toxicity from absorbed nitrogen oxides.
Suitable Extinguishing Media: Use fog, CO2, or dry chemical. Water jet must be avoided due to violent reaction.
Special Hazards: Decomposes when heated, produces toxic and corrosive vapors (nitrogen oxides, sulfur oxides). Reacts exothermically with water.
Protective Equipment: Full chemical protective suit including self-contained breathing apparatus.
Advice: Approach from upwind, evacuate downwind area, cool containers with fogging nozzles only to prevent pressure buildup and possible rupture.
Personal Precautions: Acidproof gloves, full face protection, acid-resistant suit and respirator required.
Environmental Precautions: Prevent runoff to drains, groundwater, or surface waters. Large spills may require notification of environmental authorities.
Methods for Clean-Up: Absorb with dry, inert material (such as sand or vermiculite). Do not use sawdust or organic material. Collect residue in acid-resistant container. Dispose as hazardous waste.
Decontamination: Flush small residue with large amount of water after neutralizing with soda ash only if permitted by local authorities.
Handling: Only trained professionals in properly ventilated, controlled access settings. Avoid breathing dust, vapor, or spray. Never add water directly. Use non-sparking, corrosion-resistant tools.
Storage: Store in tightly sealed, compatible containers (glass, special acid-resistant plastics). Keep in a dry, cool and well-ventilated area. Isolate from flammables, bases, reducing agents, water sources.
Incompatible Materials: Most metals, organics, water, bases, strong reducing agents.
Special Instructions: Secondary containment strongly recommended. Emergency spill kit and wash stations must be accessible.
Occupational Exposure Limits: Nitrogen oxides: OSHA PEL 25 ppm (as NO2). Sulfuric acid: OSHA PEL 1 mg/m3. Nitrosylsulfuric acid specific limits not established, but follow stricter for component gases.
Engineering Controls: Local exhaust ventilation, acid-resistant work surfaces, closed handling systems wherever possible.
Personal Protective Equipment: Acid-resistant gloves (butyl rubber, neoprene), full face shield with impact goggles, chemical-resistant body suit, acid-proof boots.
Respiratory Protection: Positive-pressure, supplied-air respirator for emergencies or any uncontrolled release.
Hygiene Measures: Thorough washing after handling. Contaminated clothing should not leave work area.
Appearance: Oily, reddish or yellow liquid or semi-solid depending on temperature
Odor: Sharp, acrid, with pungent nitrogen oxides
Odor Threshold: Immediate irritation below occupational limits
pH: < 1 (extremely acidic)
Melting Point: 2 to 15°C depending on composition
Boiling Point: Decomposes before boiling (decomposition releases toxic gases above 120°C)
Flash Point: Not flammable but evolves toxic gases with heat
Solubility: Violent decomposition with water, hygroscopic
Density: Approx. 1.8 – 1.98 g/cm3
Vapor Pressure: Low at room temperature, increases with temperature
Reactivity Notes: Vigorous with water and organic materials.
Chemical Stability: Stable under recommended storage, decomposes on exposure to moist air or heat
Possible Hazardous Reactions: Reacts violently with water, alkalis, many metals; risk of explosive gas formation.
Conditions to Avoid: Heat, humidity, contamination with organic material.
Incompatible Materials: All simple metals (especially aluminum), organics, strong bases, reducing agents.
Hazardous Decomposition Products: Nitrogen dioxide, nitric oxide, sulfur trioxide, sulfur dioxide, nitrous oxide gases.
Acute Toxicity: Highly toxic by all routes. Causes severe skin, eye, and mucous membrane burns. Inhalation of fumes or mist results in rapid respiratory distress and possible life-threatening pulmonary effects.
Chronic Exposure: Repeated exposures corrosively damage skin, eyes, and respiratory tissues. Potential for delayed pulmonary edema with significant exposure.
Sensitization: Not expected, but repeated contact can cause dermatitis.
Carcinogenicity: Some decomposition products (nitrogen oxides) are classified as possible human carcinogens.
Other Information: Immediate symptoms do not guarantee limited harm; delayed systemic effects are common.
Environmental Hazards: Spillage causes rapid acidification and destruction of aquatic and terrestrial habitats. Decomposes to form persistent and toxic nitrogen oxides.
Aquatic Toxicity: Extremely toxic to aquatic life; causes rapid and lasting pH shift leading to mass mortality at low concentrations.
Persistence and Degradability: Breaks down releasing gases but leaves acid residues and oxidized nitrate forms.
Bioaccumulation: Does not bioaccumulate but persistent nitrogen oxides alter trophic chains.
Mobility in Soil: High; moves rapidly and lowers pH, raising risk of groundwater contamination.
Disposal Methods: Must be treated as hazardous waste. Neutralization requires controlled, expert chemical treatment, never direct neutralization with water.
Contaminated Packaging: Dispose of according to hazardous waste regulations. Containers must not be reused.
Regulatory Requirements: Subject to US EPA, EU, and similar jurisdictional hazardous waste rules.
Additional Information: Authorized hazardous waste contractors only. Never dispose down any drains.
UN Number: UN3264
Proper Shipping Name: Corrosive liquid, acidic, inorganic, n.o.s. (contains Nitrosylsulfuric Acid)
Hazard Class: 8 (Corrosive)
Packing Group: I (High Danger)
Labels: Corrosive
Marine Pollutant: Yes
Special Precautions: Emergency response for spills or leaks; shipping only by trained dangerous goods handlers in approved packaging in strict compliance with all legal requirements.
OSHA: Covered under Hazard Communication Standard; severely restricted in regular workplaces.
EPA: Classified as hazardous under RCRA and CERCLA. Environmental release must be reported.
REACH Registration: Subject to strict registration and authorization in Europe.
TSCA: Listed with significant handling and reporting obligations.
SARA Title III: Listed as Extremely Hazardous Substance, triggers planning and reporting requirements.
International: Covered by ADR, IMDG, IATA for transport. Compliance with local and national chemical safety laws enforced globally.
