Sodium Molybdate Material Safety Data Sheet (MSDS)

Identification

Product Name: Sodium Molybdate
Chemical Formula: Na₂MoO₄
Synonyms: Disodium Molybdate Dihydrate, Disodium Molybdate
CAS Number: 7631-95-0
EC Number: 231-551-7
Recommended Use: Corrosion inhibitor, micronutrient in fertilizers, chemical reagent
Manufacturer/Supplier: Refer to supplier or manufacturer's address and contact details in purchase documentation
Emergency Contact: Refer to on-site emergency or poison center contact resources

Hazard Identification

GHS Classification: Acute toxicity (oral, category 4), Eye irritant (category 2A), Specific Target Organ Toxicity - single exposure (category 3)
Label Elements: Signal Word: Warning; Hazard Statements: Harmful if swallowed; Causes serious eye irritation; May cause respiratory irritation
Precautionary Statements: Wash hands thoroughly after handling; Avoid breathing dust or fume; Use only outdoors or in a well-ventilated area; Wear protective gloves/protective clothing/eye protection/face protection; If swallowed: Call a poison center or doctor/physician if you feel unwell; If in eyes: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing
Physical Hazards: Not flammable; may release irritating dust
Environmental Hazards: Harmful to aquatic life with long lasting effects

Composition / Information on Ingredients

Chemical Name: Sodium Molybdate
Percentage: 99-100%
CAS Number: 7631-95-0
Impurities and Stabilizing Additives: Product may include trace water as dihydrate (<2%) and very minor impurities related to production not expected to contribute to hazards at stated concentrations

First Aid Measures

Inhalation: Move exposed person to fresh air immediately. If symptoms of respiratory distress like coughing, sneezing, or short breath persist, consult medical attention
Skin Contact: Wash exposed skin thoroughly with water and soap. Remove contaminated clothing. Seek medical attention if irritation or rash develops
Eye Contact: Rinse eyes cautiously with water for a minimum of fifteen minutes. Hold eyelids open. Avoid rubbing the eyes. Remove contact lenses if present. If irritation continues, seek ophthalmologic assessment
Ingestion: Rinse mouth with water. Give water to drink only if person is conscious. Do not induce vomiting unless directed by medical personnel. Contact poison control or physician for advice

Fire-Fighting Measures

Suitable Extinguishing Media: Both dry chemical and foam or water spray extinguishers suppress fire. Sodium molybdate does not burn but can release fumes at high heat
Special Hazards: High temperatures may produce hazardous decomposition products such as sodium oxides, molybdenum oxides, and toxic metal fumes
Protective Equipment for Firefighters: Wear self-contained breathing apparatus (SCBA) and full protective gear to limit exposure to combustion products. Evacuate adjacent areas if smoke, fumes, or particulates become excessive

Accidental Release Measures

Personal Precautions: Wear appropriate respiratory protection, gloves, and eye protection. Avoid dust formation. Ventilate area well during cleanup
Environmental Precautions: Prevent further leakage or spillage if safe to do so. Avoid discharge to drains and waterways
Methods for Cleanup: Collect spilled powder with a clean, dry shovel or broom. Place in labelled, sealed containers for disposal following local regulations. Clean contaminated surface with water

Handling and Storage

Handling: Handle in a well-ventilated area. Use appropriate industrial hygiene and safety practices. Minimize dust generation and accumulation. Wash hands after handling
Storage: Store in original container, tightly closed, in a cool, dry location protected from humidity and moisture. Keep away from strong acids and oxidizers. Use secondary containment to prevent environmental release

Exposure Controls and Personal Protection

Engineering Controls: Use local exhaust ventilation or other engineering controls to control airborne levels below recommended exposure limits
Exposure Limits: OSHA PEL for soluble molybdenum compounds: 5 mg/m³ (total dust); ACGIH TLV: 0.5 mg/m³ (respirable fraction)
Personal Protection: Safety glasses or chemical goggles, nitrile or latex gloves, long-sleeved clothing, and a dust mask if dust generation cannot be avoided. In areas of high airborne dust, a NIOSH-approved particulate respirator is required

Physical and Chemical Properties

Appearance: White to off-white crystalline powder
Odor: Odorless
Odor Threshold: Not applicable
pH: 8.5 to 10.0 (5% solution)
Melting Point: 687°C (decomposes)
Boiling Point: Not available (decomposes before boiling)
Solubility: Soluble in water (43 g/100 ml at 25°C)
Vapor Pressure: Negligible
Specific Gravity: Approximately 3.28 (water = 1)
Other Physical Properties: Not volatile; non-flammable; does not present explosion risk

Stability and Reactivity

Chemical Stability: Stable under normal conditions of temperature and pressure
Reactivity: Not reactive under recommended storage and handling conditions
Hazardous Reactions: May react with strong acids to produce molybdic acid; contact with oxidizing agents may cause dangerous reactions
Conditions to Avoid: Avoid excessive heat, high humidity, and direct contact with strong acids
Decomposition Products: Sodium oxides and molybdenum oxides on strong heating

Toxicological Information

Acute Toxicity: Oral LD₅₀ (rat): 2733 mg/kg; Harmful if swallowed
Routes of Exposure: Inhalation, ingestion, direct contact with skin and eyes
Symptoms: Dust may irritate respiratory system and eyes. Large doses might cause headache, diarrhea, nausea, or central nervous system effects
Chronic Effects: Prolonged or repeated exposure could affect liver and kidneys
Carcinogenicity: Not classified as carcinogenic by IARC, NTP, or OSHA
Other Information: No data suggesting reproductive or mutagenicity risks at anticipated exposure levels in general workplaces

Ecological Information

Ecotoxicity: Harmful to aquatic organisms, may cause long-term effects in the aquatic environment. LC50 (fish, 96 hr): 420 mg/L
Mobility: High solubility in water means sodium molybdate can move easily through soil to water systems
Persistence and Degradability: Inorganic compound; does not degrade biodegradably
Bioaccumulation Potential: Low; molybdate ions not expected to bioaccumulate significantly
Other Ecological Details: Discharge to surface waters should be avoided to prevent adverse ecological effects

Disposal Considerations

Waste Disposal Methods: Dispose of in accordance with federal, state, and local environmental regulations. Do not discharge to sewer systems. Consult licensed waste disposal contractor for proper handling
Contaminated Packaging: Empty containers retain product residue and can be hazardous; reclaim and recycle containers where possible. Dispose of unrecyclable containers following relevant regulatory guidelines

Transport Information

UN Number: Not regulated under ADR/RID, IMDG, or IATA
Proper Shipping Name: Not classified as hazardous for transport
Transport Hazard Class: Not applicable
Packing Group: Not applicable
Special Precautions: Prevent release in transit. Ensure containers are correctly secured and labelled

Regulatory Information

US Regulations: Listed on TSCA inventory. Not subject to reporting under SARA Title III Section 313
EU Regulations: Listed under REACH, not classified as a substance of very high concern
Other Regulations: Follow applicable worker protection and workplace safety acts. Product safety and handling guidance are required under OSHA Hazard Communication Standard and equivalent standards globally