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Product Name: Sludge Sulfuric Acid
Synonyms: Spent Sulfuric Acid, Residual Sulfuric Acid
CAS Number: 7664-93-9
Recommended Use: Industrial applications, wastewater treatment, chemical manufacturing
Manufacturer/Supplier: Commercial chemical supply companies
Emergency Contact: National Poison Control, local emergency services, or occupational safety officer
Hazard Class: Corrosive to metals and tissue, strong acid
GHS Symbols: Corrosive (skin, eyes); Danger
Acute Health Effects: Severe burns, eye damage, skin irritation, respiratory distress if inhaled
Chronic Health Effects: May cause long-term lung and dental damage with extended exposure
Environmental Risk: Hazardous to aquatic life, acidic run-off impacts soil and water chemistry
Main Component: Sulfuric Acid – 70-95%
Byproducts: Iron compounds, organic residuals, trace metals present (copper, lead)
Impurities: Water, industrial residues, suspended solids
Hazardous Components: Hydrogen ions (high concentration), sulfate ions, heavy metal contaminants dependent on origin
Inhalation: Move person to fresh air immediately, seek medical attention if breathing difficulties persist, administer oxygen if trained to do so
Skin Contact: Flush affected skin with running water for at least 20 minutes, remove contaminated clothing, do not use neutralizing chemicals on skin
Eye Contact: Rinse eyes with water or saline for at least 30 minutes, hold eyelids open, transport to emergency facility as soon as possible
Ingestion: Do not induce vomiting, rinse mouth with clean water, drink water if able, immediate hospital treatment necessary to prevent esophageal perforations
Notes for Medical Personnel: Monitor for respiratory distress and shock, provide supportive treatment, consider diluted milk of magnesia only with medical consultation
Suitable Extinguishing Media: Dry chemical, foam, or carbon dioxide extinguishers for surrounding fires; sulfuric acid itself does not burn
Special Hazards: Acid reacts with most metals, producing hydrogen gas which can ignite or explode
Protective Equipment: Full protective acid-resistant suits, self-contained breathing apparatus
Specific Measures: Keep unnecessary personnel away, use water spray to keep containers cool, avoid water contact with acid when not necessary as it can cause splattering and toxic mist
Personal Precautions: Evacuate area, restrict entry, put on acid-resistant gloves, face shield, respirators as needed
Spill Response: Contain spill with earth, sand, or commercial absorbents, do not use sawdust or other organic material
Neutralization: Carefully neutralize with lime or soda ash if trained, always add acid to water, not water to acid
Cleanup: Place residues in approved containers, ventilate area, wash down area with large amounts of water after neutralization, prevent runoff from entering drains
Environmental Precautions: Avoid discharge to environment, inform environmental authorities if large quantities enter waterways
Handling: Use only in well-ventilated areas, avoid contact with skin, eyes, clothing, and organic or combustible materials
Equipment: Use corrosion-resistant tools and containers (stainless steel, glass, certain plastics)
Storage Requirements: Store in tightly closed, labeled containers in cool, dry, well-ventilated locations specifically designed for acids
Keep Away From: Water sources, strong bases, many metals, flammable substances, reducing agents
Safe Transfer: Always add acid slowly to water, never reverse, use appropriate pumps or transfer hoses for concentrated acids
Occupational Exposure Limits: OSHA PEL: 1 mg/m³ (sulfuric acid mist)
Ventilation: Local exhaust ventilation, chemical fume hoods in laboratory settings
Eye Protection: Chemical goggles, full face shield
Skin Protection: Chemical-resistant gloves (nitrile, butyl rubber, neoprene), acid-resistant clothing, boots
Respiratory Protection: Respirators suitable for acid mist, cartridge type for acids, SCBA for high concentrations
Hygiene Measures: Wash hands and face before eating, remove contaminated clothing immediately, do not eat or drink while handling acid
Appearance: Dark, oily liquid; sometimes brownish or black
Odor: Strong, irritating, acidic odor
pH: Extremely low, typically below 1
Melting Point: Varies depending on concentration; usually below 10°C
Boiling Point: 290°C (concentrated), lower for dilute or contaminated acid
Solubility in Water: Completely miscible, generates significant heat
Specific Gravity: Around 1.8 – 2.0 (concentrated sludge acid)
Vapor Pressure: Negligible at room temperature
Evaporation Rate: Slow
Corrosivity: Attacks most metals, concrete, and many organic materials
Stability: Stable under recommended storage conditions
Thermal Decomposition: May produce sulfur oxides, toxic volatile acids
Reactive Hazards: Violent reaction with bases, water, metals (hydrogen gas), organic materials, reducing agents
Polymerization: Polymerization does not occur
Incompatible Materials: Chlorates, carbides, fulminates, picrates, strong bases, organic substances
Hazardous Decomposition Products: Sulfur dioxide, sulfur trioxide, hydrogen gas under certain conditions
Routes of Exposure: Eye contact, inhalation, skin contact, ingestion
Acute Toxicity: Severe burning on contact, high doses inhaled or ingested can cause death
Chronic Effects: Respiratory impairments, dental erosion, skin ulceration with repeated exposure
Carcinogenicity: Occupational exposure to strong acid mists classified as Group 1 carcinogen by IARC
Symptoms: Redness, pain, blistering, vision loss, pulmonary edema if inhaled deeply
Sensitization: Not known to cause sensitization, but repeated exposures increase risk of long-term damage
Ecotoxicity: Toxic to aquatic organisms, disrupts biological wastewater treatment processes, acidifies water bodies
Persistence and Degradability: Sulfuric acid dissociates fully in water; ions remain for extended periods
Bioaccumulation Potential: Does not bioaccumulate, but stable ions persist in the environment
Soil Impact: Reduces soil pH, releases metals from soil matrices, impacts plant growth
Other Hazards: Alters natural water systems, destroys macroinvertebrate communities in contaminated water
Disposal Methods: Neutralize acid waste using limestone, lime, or soda ash before disposal; check pH levels after treatment
Regulatory Requirements: Hazardous waste according to federal, state, and local regulations
Incineration: Do not incinerate contaminated containers without complete neutralization
Container Disposal: Rinse thoroughly using neutralizing agent, then triple rinse and dispose of as hazardous waste
Prevent Disposal Into: Stormwater, drains, natural water bodies without thorough neutralization and formal clearance
UN Number: UN 1830
Proper Shipping Name: Sulfuric Acid, Spent (Sludge Sulfuric Acid)
Transport Hazard Class: 8 (Corrosive substances)
Packing Group: II or III, depends on concentration
Label: Corrosive
Special Transport Notes: Use acid-resistant, sealed containers with secondary containment, keep upright, provide documentation of content and hazards at all times
Prohibited Transport: Do not transport with combustibles, foodstuffs, organic peroxides, or strong bases
OSHA Regulations: Listed as hazardous under Hazard Communication Standard
EPA Regulations: Reportable under Clean Water Act, hazardous substance under CERCLA
TSCA Status: Listed
SARA Title III: Subject to reporting under Section 302 (EHS), Section 304 (release), Section 313 (toxic chemical release inventory)
Other Local/International Laws: Subject to state and municipal codes for acid handling and disposal, covered by European REACH, CLP, ADR, and GHS guidelines for transport and labeling
Workplace Signage: Required for all storage and handling locations, with emergency contact info and hazard pictograms prominently displayed
