Material Safety Data Sheet: Ammonium Dimolybdate

Identification

Product Name: Ammonium Dimolybdate
Chemical Formula: (NH₄)₂Mo₂O₇
CAS Number: 27546-07-2
EC Number: 247-815-6
Relevant Identified Use: Laboratory reagent, catalyst production, ceramics manufacturing, pigment synthesis
Supplier: Firm name and contact details provided on shipping paperwork
Emergency Phone: Refer to company emergency contact or local poison control

Hazard Identification

Classification: Acute toxicity, category 4 (oral, inhalation); Eye irritation, category 2A; Specific target organ toxicity (single exposure), category 3
Label Elements: Signal word: Warning; Hazard statements: Harmful if swallowed or inhaled; Causes serious eye irritation; May cause respiratory irritation
Pictograms: Exclamation mark (GHS07)
Potential Health Effects: Irritation of eyes, skin, and respiratory system; ingestion may cause nausea, vomiting, diarrhea; dust may aggravate pre-existing respiratory disorders
Environmental Hazards: May be harmful to aquatic life with long-lasting effects

Composition / Information on Ingredients

Chemical Name: Ammonium Dimolybdate
CAS Number: 27546-07-2
Concentration: 100% (pure substance)
Impurities: No significant impurities affecting safety, as supplied

First Aid Measures

Inhalation: Move person to fresh air; monitor for breathing difficulty; seek medical attention if symptoms persist
Skin Contact: Remove contaminated clothing, rinse skin with plenty of water for at least 15 minutes; seek medical help for irritation
Eye Contact: Immediately flush eyes with clean, running water for at least 15 minutes, holding eyelids open; immediate medical attention recommended
Ingestion: Rinse mouth and drink water; do not induce vomiting; medical treatment necessary
Most Important Symptoms: Eye, skin, and respiratory tract irritation; gastrointestinal upset on ingestion

Fire-Fighting Measures

Suitable Extinguishing Media: Use dry chemical powder, CO₂, or foam; water spray for small fires
Unsuitable Extinguishing Media: Avoid using direct water streams on spillage
Specific Hazards: Can emit irritating or toxic molybdenum oxide fumes when heated to decomposition
Protective Equipment: Firefighters wear self-contained breathing apparatus and full protective gear
Special Procedures: Evacuate area, control run-off water to prevent environmental contamination

Accidental Release Measures

Personal Precautions: Use of chemical-resistant gloves, safety goggles, and respiratory protection for dust
Environmental Precautions: Prevent entry into drains, surface water, soil
Methods for Cleanup: Avoid generating dust; sweep spilled material into appropriate container for disposal; ventilate area
Decontamination: Wash spill area with water after material pickup

Handling and Storage

Handling: Handle in well-ventilated spaces; avoid inhaling dust or contact with skin and eyes; maintain good hygiene during use
Storage Conditions: Store in tightly closed containers in cool, dry, well-ventilated area
Stacks and Separation: Keep away from acids and strong reducing agents
Incompatible Materials: Strong acids, strong oxidizers
Other Precautions: Use proper grounding and bonding during transfer to avoid static discharge

Exposure Controls and Personal Protection

Occupational Exposure Limits: No established exposure limit specifically for ammonium dimolybdate; refer to molybdenum compound limits (OSHA PEL: 5 mg/m³ [soluble Mo] TWA)
Engineering Controls: Mechanical ventilation or local exhaust to control dust
Personal Protective Equipment: Approved dust respirator, safety goggles, chemical-protective gloves, lab coat or full-body covering
Hygiene Measures: Wash hands before eating or drinking; remove contaminated clothing; avoid inhalation and prolonged contact

Physical and Chemical Properties

Appearance: White or faintly yellow crystalline powder
Odor: Odorless
Melting Point: Decomposes before melting
Boiling Point: Not applicable
pH: ~5 (5%, aqueous solution)
Solubility: Soluble in water; low solubility in alcohol
Density: 2.97 g/cm³ (at 20°C)
Vapor Pressure: Not available
Other Properties: Decomposes under strong heating; may be slightly hygroscopic

Stability and Reactivity

Chemical Stability: Stable at room temperature under recommended conditions
Reactivity: Incompatible with strong acids and oxidizing or reducing agents
Hazardous Decomposition Products: Ammonia, nitrogen oxides, molybdenum oxides may form under fire or thermal decomposition
Polymerization: Will not occur
Conditions to Avoid: High temperature, humidity, contact with incompatible substances

Toxicological Information

Acute Toxicity: Harmful if swallowed or inhaled; LD₅₀ (oral, rat): ~2000 mg/kg
Skin and Eye Irritation: Causes irritation upon contact; concentrated exposures increase risk
Inhalation Risks: Breathing dust may cause coughing, sore throat, and shortness of breath
Chronic Effects: Prolonged exposure may affect gastrointestinal, renal, or respiratory systems
Carcinogenicity: Not listed as carcinogenic by NTP, IARC, OSHA
Sensitization: No evidence of skin sensitization reported

Ecological Information

Ecotoxicity: Aquatic organisms may be harmed in high concentrations; fish, daphnia tests show moderate toxicity
Persistence and Degradability: Mineral compound not expected to biodegrade
Bioaccumulative Potential: Not anticipated to bioaccumulate in aquatic systems
Mobility in Soil: Compound may migrate in water; avoid release in surface or ground water
Other Adverse Effects: Prevent contamination of soil and waterways to reduce long-term environmental impact

Disposal Considerations

Waste Disposal Methods: Collect in properly labeled containers; submit for disposal per local, state, and federal regulations
Waste Codes: Not classified as hazardous waste under RCRA in the US, but local requirements may differ
Contaminated Packaging: Containers should be rinsed and disposed of as chemical waste
Other Precautions: Do not discharge into drains or natural water sources; involve licensed waste services

Transport Information

UN Number: Not regulated for transport under ADR/RID, IMDG, IATA
Proper Shipping Name: Ammonium dimolybdate or related compound
Transport Hazard Class: Not assigned
Packing Group: Not assigned
Marine Pollutant: Not classified
Special Precautions: Avoid dust formation; secure packaging to prevent spillage during transit

Regulatory Information

US Regulations: SARA Title III - not listed as an extremely hazardous substance; TSCA inventory: listed
EU Regulations: REACH registration not required for quantities below one ton/year for laboratory use
Canadian Regulations: DSL/NDSL: listed
Other International Regulations: Available on national chemical inventories in most countries; handle with standard chemical precautions in regulated environments
Labeling: GHS-compliant safety labeling and hazard identification required in workplace