Material Safety Data Sheet (MSDS) for Molybdophosphoric Acid

Identification

Product Name: Molybdophosphoric Acid
Chemical Name: Phosphomolybdic acid
Common Synonyms: Phosphomolybdic acid hydrate, Dodecamolybdophosphoric acid
CAS Number: 51429-74-4
Recommended Use: Laboratory reagent, catalyst in organic synthesis, staining agent in histology
Supplier: Laboratory and chemical supply companies
Telephone Number: Provided by manufacturer
Emergency Contact: Refer to local poison control center or manufacturer hotline

Hazard Identification

Hazard Classification: Corrosive, Oxidizing, Irritant
GHS Label Elements: Corrosion pictogram, exclamation mark pictogram, oxidizer pictogram
Signal Word: Danger
Hazard Statements: Causes severe skin burns and serious eye damage, Harmful if swallowed, May cause respiratory irritation
Precautionary Statements: Avoid breathing dust or mist, Wear protective gloves, Wear eye and face protection, Wash hands thoroughly after handling, Use only outdoors or in well-ventilated areas
Potential Health Effects: Skin contact may result in burns, Inhalation can lead to coughing and throat irritation, Ingestion may cause gastrointestinal distress or internal damage

Composition / Information on Ingredients

Chemical Name: Phosphomolybdic acid hydrate
Formula: H₃PMo₁₂O₄₀·xH₂O
Concentration: 98–100% (hydrate form may vary)
Impurities: Typically contains trace water, optional sodium or ammonium counterions in variant grades
EC Number: 610-977-7

First Aid Measures

Eye Contact: Immediately rinse with plenty of water for at least 15 minutes, keep eyelids open, remove contact lenses if present, seek medical attention
Skin Contact: Remove contaminated clothing, rinse skin with water or shower for at least 15 minutes, seek medical advice
Inhalation: Move exposed individual to fresh air, monitor for difficulty breathing, treat symptomatically, obtain medical assistance
Ingestion: Rinse mouth with water, never attempt to induce vomiting unless instructed by medical personnel, seek immediate medical help

Fire-Fighting Measures

Suitable Extinguishing Media: Water spray, dry chemical powder, foam, carbon dioxide
Unsuitable Extinguishing Media: None identified for small fires, avoid high-pressure water which may spread Molybdophosphoric acid
Special Hazards: Decomposition emits toxic fumes of phosphorus oxides, molybdenum oxides
Protective Equipment: Self-contained breathing apparatus, full protective clothing
Firefighting Advice: Approach fire from upwind direction, prevent fire-fighting water from entering water supplies or sewers, cool containers exposed to fire using water spray

Accidental Release Measures

Personal Precautions: Use goggles, chemical-resistant gloves, suitable protective clothing
Environmental Precautions: Prevent entry to soil, drains, or water courses, notify authorities if spillage occurs
Cleanup Procedures: Absorb liquid spills with inert material (sand, diatomite), collect in closed containers for disposal, ventilate area, clean spill area with water after material removal
Containment: Dike spill for containment, avoid runoff into environment, do not touch spilled material without proper protection

Handling and Storage

Handling: Use only in well-ventilated areas, minimize dust generation, handle with approved chemical-resistant gloves and goggles, avoid inhalation of dust or vapors
Storage: Store in tightly closed container, away from direct sunlight, heat, and incompatible materials such as strong reducing agents, separate from food and drink, keep in a cool, dry, well-ventilated environment
Special Instructions: Label area and containers with appropriate hazard signage, maintain MSDS access near storage area for emergencies

Exposure Controls and Personal Protection

Occupational Exposure Limits: No established ACGIH or OSHA limits for Molybdophosphoric acid, use control bands for hazardous substances
Ventilation: Employ local exhaust ventilation, chemical fume hood for laboratory settings
PPE: Wear chemical splash goggles, gloves made of nitrile or neoprene, lab coat or apron, appropriate respiratory protection if dust or mist exposure
Hygiene Measures: Wash hands and face after handling, remove and wash contaminated clothing before reuse, do not eat or drink in the work area

Physical and Chemical Properties

Appearance: Yellow-green crystalline powder or solid
Odor: None to weak acidic
Molecular Weight: 1825.25 g/mol (anhydrous)
pH (1% solution): <1 (strongly acidic)
Melting Point: 183°C (decomposition)
Solubility: Soluble in water, alcohols, slightly soluble in ether
Boiling Point: Not available (decomposes)
Vapor Pressure: Negligible at ambient temperatures
Density: Approximately 2.8 g/cm³
Partition Coefficient (log Pow): Not applicable
Decomposition Temperature: Above 183°C
Other Properties: May absorb moisture from air (hygroscopic)

Stability and Reactivity

Chemical Stability: Stable under recommended storage and handling conditions
Reactivity: Reacts with strong reducing agents, strong bases, organic materials
Conditions to Avoid: Moisture, high temperatures, incompatible substances
Incompatible Materials: Reducing agents, organic combustibles, alkali bases
Hazardous Decomposition: Phosphorus oxides, molybdenum oxides, irritating fumes
Polymerization: No hazardous polymerization expected

Toxicological Information

Routes of Exposure: Eye contact, skin contact, inhalation, ingestion
Acute Toxicity: Data limited, may cause burns, severe irritation, gastrointestinal upset
Skin Corrosion/Irritation: Causes burns, may result in ulceration or scarring
Serious Eye Damage/Irritation: Can cause severe, possibly permanent damage
Inhalation: May cause respiratory tract irritation, coughing, dizziness
Ingestion: Corrosive, may produce abdominal pain, nausea, vomiting, risk of chemical burns
Chronic Effects: Extended or repeated contact could intensify local effects, risk of sensitization is low
Carcinogenicity: Not listed by NTP, IARC, OSHA as carcinogenic
Mutagenicity / Reproductive Toxicity: No specific data available

Ecological Information

Ecotoxicity: Harmful to aquatic organisms in concentrated form, potential long-term adverse effects in aquatic environment
Persistence and Degradability: Not readily biodegradable, stable under most environmental conditions
Bioaccumulative Potential: Expected to have low potential for bioaccumulation due to water solubility and high molecular mass
Mobility in Soil: Mobile due to water solubility, may migrate into groundwater if released
Other Adverse Effects: Acidic properties may alter local pH, affecting aquatic life
Avoid Environmental Release: Collect spills, prevent from entering drains, surface or groundwater

Disposal Considerations

Waste Disposal Methods: Contact licensed waste disposal contractor, dispose as hazardous waste due to corrosive, oxidizing character
Disposal of Packaging: Rinse containers with water, treat liquid as hazardous, dispose following local, regional, national regulations
Do Not: Pour large quantities down drains or water courses, incinerate in open air, mix with incompatible substances before disposal
Preferred Disposal: Chemical neutralization under expert supervision, followed by landfill in accordance with environmental authorities

Transport Information

UN Number: 3261
UN Proper Shipping Name: Corrosive Solid, Acidic, Inorganic, N.O.S. (contains Molybdophosphoric acid)
Transport Hazard Class(es): 8 (corrosive substances)
Packing Group: II
Marine Pollutant: Not classified as marine pollutant in most jurisdictions, check local regulations
Special Precautions: Avoid transportation alongside incompatible substances, use strong secondary containment, ensure clear labeling of transport containers

Regulatory Information

TSCA: Listed on the US Toxic Substances Control Act inventory
EU REACH: Complies with applicable pre-registration requirements, monitor for updates
Canada DSL/NDSL: Included in inventory
WHMIS Classification: E (Corrosive Material)
OSHA Hazard Communication: Meets requirements for hazardous chemical
SARA Title III: Not on SARA 313 List, not a Section 302 extremely hazardous substance
Label Requirements: Name, hazards, precautionary statements, emergency contact on all storage containers
Other Country-Specific Regulations: Refer to local chemical control agencies and workplace requirements for up-to-date information