Material Safety Data Sheet: Manganese Selenide

Identification

Product Name: Manganese Selenide
Synonyms: Manganese(II) selenide, Manganese monoselenide, MnSe
Chemical Formula: MnSe
CAS Number: 1313-82-2
Manufacturer: Contact local chemical supplier or distributor
Recommended Use: Research and industrial applications
Restrictions on Use: Not intended for food, drug, household or cosmetic use
Emergency Contact: Local poison control center, medical emergency support number provided by supplier

Hazard Identification

GHS Classification: Acute Toxicity (Oral, Inhalation, Dermal: Category 3), Skin Irritation (Category 2), Eye Irritation (Category 2A), Specific Target Organ Toxicity (Repeated Exposure: Category 2)
Signal Word: Danger
Hazard Statements: Toxic if swallowed, inhaled, or absorbed through skin. Causes skin and eye irritation. Suspected of causing damage to organs through prolonged or repeated exposure.
Pictograms: Skull & Crossbones, Exclamation Mark, Health Hazard
Precautionary Statements: Avoid all contact with skin and eyes. Use personal protective equipment. Do not breathe dust. Wash thoroughly after handling. Do not eat, drink, or smoke during use. Seek medical attention if you feel unwell.

Composition / Information on Ingredients

Chemical Name: Manganese Selenide
Formula: MnSe
Concentration: 100% by weight
Impurities/Additives: Trace metal contaminants possible based on source material; refer to supplier for specifics.
Other Components: No additives, binders, or diluents listed.

First Aid Measures

Inhalation: Move person to fresh air immediately. Avoid breathing dust. Provide artificial respiration and oxygen if breathing stops. Seek medical attention urgently, even if symptoms subside.
Skin Contact: Remove contaminated clothing. Wash skin thoroughly with soap and water for at least 15 minutes. Use emergency shower if available. Get medical advice for irritation or signs of toxicity.
Eye Contact: Rinse eyes carefully with water for at least 15 minutes, lifting upper and lower lids. Remove contact lenses if present and easy to do. Obtain medical assistance as soon as possible.
Ingestion: Do not induce vomiting unless instructed by medical personnel. Rinse mouth with water. Never give anything by mouth to an unconscious individual. Immediate medical help is required.
Symptoms/Effects: Nausea, vomiting, headache, dizziness, skin and eye redness, respiratory discomfort, abdominal pain. High exposures may trigger nervous system effects, convulsions, or organ damage.

Fire-Fighting Measures

Suitable Extinguishing Media: Dry chemical, foam, carbon dioxide (CO₂), or sand. Water spray may spread powder if not used carefully. Select extinguishing agents based on surrounding fire.
Unusual Fire Hazards: Manganese selenide is not highly flammable but may decompose at high temperatures, releasing toxic selenium and manganese fumes (selenium oxides, manganese oxides). Thermal decomposition may produce irritating or poisonous gases.
Protective Equipment: Firefighters should wear self-contained breathing apparatus (SCBA) and full protective clothing.
Advice for Firefighters: Cool containers with water spray if exposed to fire. Prevent runoff from entering drains or waterways.

Accidental Release Measures

Personal Protection: Evacuate unnecessary personnel and restrict access. Wear protective clothing, gloves, safety goggles, and an approved respirator.
Environmental Precautions: Prevent spillage from entering drains, surface water, or soil. Inform appropriate authorities of any significant release.
Containment/Cleanup: Collect spilled powder using wet methods or HEPA vacuum. Avoid raising dust. Place in a suitable, clearly labeled container for disposal. Wash area with water following cleanup, collecting contaminated water for disposal.

Handling and Storage

Precautions for Handling: Handle with care in a controlled environment. Use adequate ventilation or local exhaust to prevent dust formation. Wear suitable personal protective equipment. Avoid ingesting, inhaling, or allowing the powder to contact skin, eyes, or clothing. Wash hands after handling.
Storage: Store in tightly closed, clearly labeled containers away from incompatible substances such as acids and strong oxidizers. Keep in a cool, dry, well-ventilated area away from moisture. Segregate from food and drink. Limit access to trained personnel.

Exposure Controls and Personal Protection

Exposure Limits: OSHA PEL for manganese: 5 mg/m³ ceiling (as manganese compounds); NIOSH REL: 1 mg/m³. No established limits for selenides, but selenium compounds often regulated at 0.2 mg/m³ (ACGIH TLV).
Engineering Controls: Use fume hood or local exhaust ventilation to minimize dust and airborne exposure. Use closed systems where practical.
Personal Protective Equipment (PPE): Wear chemical-resistant gloves (nitrile, neoprene), protective lab coat or coveralls, eye protection (safety glasses or chemical splash goggles), and a fit-tested NIOSH-approved respirator with particulate filter for potentially dusty work.
Hygiene: No open food or drinks in the work area. Wash hands after handling, before breaks, and at end of shift.

Physical and Chemical Properties

Appearance: Fine powder or crystalline solid; color typically reddish-brown or pink
Odor: Odorless
Molecular Weight: 133.86 g/mol
Melting Point: 1280°C
Boiling Point: Decomposes before boiling
Solubility: Insoluble in water
Density: 6.47 g/cm³ at 25°C
pH: Not applicable (insoluble)
Other: Non-volatile, not flammable under most conditions; may produce hazardous fumes at high temperatures or during reaction with acids

Stability and Reactivity

Chemical Stability: Stable under recommended storage conditions. Sensitive to strong acids, oxidizers, and prolonged exposure to moisture.
Possibility of Hazardous Reactions: Reacts with acids to release toxic hydrogen selenide gas. Contact with oxidizing agents can enhance fire or explosion risk.
Hazardous Decomposition Products: Manganese oxides, selenium oxides, hydrogen selenide
Conditions to Avoid: High humidity, moisture, acids, oxidizers, direct sunlight, heat

Toxicological Information

Routes of Exposure: Inhalation, ingestion, skin or eye contact
Acute Toxicity: Ingestion or inhalation may cause nausea, vomiting, abdominal pain, dizziness, respiratory distress; higher exposures can affect liver, kidney, nervous system
Chronic Effects: Prolonged or repeated exposure may damage nervous system and other organs. Manganese exposure is linked to neurological symptoms similar to Parkinson’s disease. Selenium compounds can cause toxic effects with chronic exposure.
Skin/Eye Irritation: Dust causes irritation. Prolonged skin contact can increase risk of absorption and toxicity.
Sensitization: Not known to cause allergic reactions.
Carcinogenicity/Mutagenicity: Not listed by IARC, NTP, or OSHA as carcinogenic.

Ecological Information

Toxicity to Aquatic Life: Highly toxic to aquatic organisms. Selenium compounds are known to cause bioaccumulation and adverse effects on wildlife, especially fish and birds.
Persistence/Degradability: Inorganic compound; does not degrade readily in the environment.
Bioaccumulative Potential: Selenium is known to bioaccumulate; risk of environmental buildup when released.
Mobility in Soil: Minimal mobility; possible migration if released in large amounts.
Other Adverse Effects: Environmental exposure can threaten local ecosystems and water systems; proper containment and disposal is necessary.

Disposal Considerations

Disposal Methods: Collect waste and contaminated cleanup materials in clearly labeled, sealed containers. Dispose of through a licensed hazardous waste contractor. Never release to environment, sewer, or general trash.
Contaminated Packaging: Rinse containers only if permitted by local authorities and send to approved waste management facility.
Regulations: Waste may be classified as hazardous under RCRA (Resource Conservation and Recovery Act). Review local, state, and federal requirements. Keep disposal records as required.

Transport Information

UN Number: UN3288
UN Proper Shipping Name: Toxic Solid, Inorganic, N.O.S. (Manganese Selenide)
Transport Hazard Class: 6.1 (Toxic substances)
Packing Group: III (medium danger)
Labels Required: Toxic (skull and crossbones symbol)
Transportation Precautions: Keep container tightly closed. Secure against shifting and damage. Handle only by trained personnel. Comply with IATA, IMDG, and DOT transport rules.

Regulatory Information

TSCA Status: Listed or otherwise compliant
OSHA Hazard Communication: Covered; toxic dust
SARA 313: Subject to reporting requirements for manganese and selenium compounds
California Proposition 65: Not specifically listed, but manganese compounds and selenium recognized as toxic
Other International Rules: WHMIS (Canada): D1A (Very Toxic), D2B (Toxic); ECHA (EU): Check REACH registration status. Requirements may vary by country.
Workplace Protection: Exposure limits and personal conduct guided by federal, state, and local laws along with company policies.