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Chemical Name: Ammonium Metavanadate
Formula: NH4VO3
CAS Number: 7803-55-6
Appearance: Pale yellow crystalline solid
Common Uses: Laboratories use this compound in the synthesis of catalysts, dyes, and ceramics; water treatment facilities use it for analytical chemistry applications and as a stain in microscopy.
Acute Toxicity: Inhalation and skin contact cause irritation and can harm vital organs. Ingestion results in nausea, vomiting, and abdominal cramps.
Chronic Exposure: Prolonged handling risks respiratory system damage, adverse effects on kidneys, and negative impacts on blood cells. Evidence links chronic vanadium compound exposure with decreased lung function among industrial workers.
Physical Hazards: Though non-flammable, the dust causes air quality concerns in confined or unventilated environments.
Component: Ammonium Metavanadate
Purity: ACS grade, typically greater than 99%
Other Components: No significant impurities reported in analytical-grade batches. Minor water content is possible.
Vanadium Content: Substantial since the compound serves as a primary vanadium source in laboratory settings.
Inhalation: Move to fresh air at once; persistent cough or shortness of breath requires medical attention.
Skin Contact: Strip contaminated clothing and wash skin with plenty of water and mild soap for at least 15 minutes.
Eye Contact: Rinse eyes gently under running water for 15 minutes and avoid rubbing the eyes. Seek prompt medical advice for persistent irritation.
Ingestion: Do not induce vomiting; rinse mouth and drink water if the victim is conscious. Immediate physician evaluation is critical due to systemic toxicity risk.
Flammability: Substance itself does not burn, but toxic fumes are released in a fire.
Suitable Extinguishing Media: Use water spray, foam, dry chemical, or carbon dioxide on surrounding fires.
Fire-Fighting Precautions: Self-contained breathing apparatus and full protective gear are needed due to possible release of vanadium oxides and ammonia during decomposition.
Hazardous Combustion Products: Toxic vapors include nitrogen oxides and vanadium pentoxide.
Personal Precautions: Wear gloves, goggles, and dust masks; ventilate work areas thoroughly before cleanup.
Containment: Carefully scoop spilled material to prevent dust spreading. Avoid sweeping, which stirs up particles.
Clean-Up Procedure: Place solids in secure containers; use damp cloths for surface wiping.
Disposal: Treat all residues as hazardous waste pending appropriate disposal.
Handling: Pouring or measuring benefits from using local exhaust ventilation and limiting open container time.
Storage: Store in tightly closed containers in dry, cool, and well-ventilated cabinets, away from acids or food.
Segregation: Keep out of reach of those untrained in hazardous chemicals. Restrict access as part of lab best practices.
Safe Practices: Label containers clearly; safety showers and eyewash stations need to be nearby.
Engineering Controls: Laboratory fume hoods prevent airborne particle buildup.
Personal Protective Equipment (PPE): Nitrile or neoprene gloves, chemical splash goggles, lab coats, and, if necessary, NIOSH-approved particulate respirators.
Exposure Limits: OSHA and ACGIH have established vanadium pentoxide dust limits; typical recommendations are time-weighted average exposures below 0.05 mg/m3.
Hygiene Measures: Wash hands thoroughly before eating or drinking. Contaminated clothing needs regular laundering.
Appearance: Yellowish crystals or powder
Odor: Slight ammonia-like smell
Solubility: Dissolves well in water, less so in alcohols
Melting Point: Decomposes without clear melting
Boiling Point: Not applicable—compound decomposes on heating
Density: Roughly 2.32 g/cm3
Chemical Stability: Stable in dry conditions at room temperature; decomposes with moisture or acids, producing irritating or toxic gases.
Incompatible Materials: Strong acids or reducing agents trigger potentially hazardous reactions.
Decomposition Products: Ammonia, vanadium oxides, and nitrogen oxides are released during heating.
Hazardous Reactions: No especially violent reactions reported in academic uses, but reactivity increases with exposure to strong oxidizing acids.
Acute Toxicity: Poisoning leads to cramping, diarrhea, yellowing of the skin, and breathing difficulties.
Long-Term Exposure Effects: Documented cases point toward anemia, kidney damage, and respiratory system irritation after long-term vanadium contact.
Irritation: Dust and solutions can cause eye and skin irritation—sometimes severe among those with pre-existing sensitivities.
Sensitization: Some individuals develop allergies with repeated skin exposure. Not every user will, but the risk grows with poor handling.
Toxicity to Aquatic Life: Vanadium compounds present a significant hazard to aquatic organisms, even at low concentrations.
Mobility: Water solubility allows ready movement through soil and waterways; accidental disposal threatens local streams.
Persistence: Vanadium does not degrade easily in the ecosystem and accumulates in sediments.
Bioaccumulation: Evidence suggests laboratory discharge can result in vanadium uptake by fish and plants, which then enter the food chain.
Waste Handling: Laboratory residues and containers require hazardous waste collection rather than general landfill.
Destruction Methods: Chemical neutralization before disposal needs professional oversight—do not attempt improvised neutralization.
Regulatory Requirements: Disposal routes must comply with local and federal hazardous waste laws that prohibit drain dumping or simple incineration.
Classification: Ammonium Metavanadate classifications vary, but most regulations flag it as a hazardous substance.
Packaging: Use strong, sealed, and accurately labeled containers to avoid accidental spills during transit.
Special Precautions for Transport: Prevent dust generation—transport with other chemicals only if fully compatible and secure.
Occupational Limits: Vanadium compounds are subject to workplace exposure and safety standards established by both OSHA and ACGIH.
Environmental Laws: Federal and state agencies regulate air emissions and water discharges for vanadium. Unpermitted releases can result in legal and financial penalties.
Hazard Communication: Labeling and documentation requirements make up an essential part of legal compliance for laboratories and industrial sites.
Worker Right-to-Know: Regulations mandate training and access to safety information for all staff handling compounds like Ammonium Metavanadate.
