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Substance Name: 1-Methyl-3-Ethylimidazolium Bromide
Chemical Formula: C6H11BrN2
CAS Number: 145022-44-2
Common Usage: Laboratories have made this ionic liquid a regular guest in solvent systems and green chemistry projects, especially for tasks that put an eco-friendly touch to once-messy extractions or syntheses.
Physical Form: Crystalline solid or near-solid, usually white to pale yellow.
Physical Hazards: No explosion risk under standard lab conditions. Not an especially volatile substance, so accidental inhalation stays low, but fine particles in the air can still cause issues in badly ventilated spaces.
Health Hazards: Skin and eye irritant, based on first-hand experience from glove mishaps. Ingestion leads to GI discomfort—no one wants to find out the details. Not enough data for chronic exposure, but no one likes guessing games in the lab.
Environmental Hazards: Not biodegradable. Takes its sweet time breaking down — careful handling protects local water systems.
Main Ingredient: 1-Methyl-3-Ethylimidazolium Bromide, generally above 98% purity in laboratory stock.
Impurities: Trace levels of organic imidazole derivatives sometimes hitch a ride during synthesis, but nothing present in high enough concentrations to post extra risk.
Skin Contact: Rinse skin well with running water. Soap helps, even if time feels short during spills. Remove contaminated clothing quickly.
Eye Contact: Hold eyes open and rinse with gentle water stream for at least fifteen minutes. Use both hands; don’t quit early.
Inhalation: Get into fresh air, especially if headache, coughing, or irritation starts up. Sit down, breathe slowly, seek further care if symptoms refuse to leave.
Ingestion: Rinse mouth thoroughly, drink water only if awake and alert, then get medical help. Never force vomiting.
Suitable Extinguishing Media: Water mist, dry chemical, foam, or CO2.
Unsuitable Media: High-pressure water jets can spread powdered solids — avoid those.
Special Hazards: Decomposition sparks out toxic fumes, often bromide and nitrogen oxides. Use self-contained breathing gear in fire.
Protective Actions: Cool whatever containers are near the fire with water, even once the fire gets under control; breaks or ruptures happen when you least expect.
Personal Precautions: Fresh gloves, splash goggles, and ventilation matter more than people think. Sometimes, the urge to sweep it up quickly leads to careless exposure.
Environmental Precautions: Block the path to sink drains or runoff surfaces. Wipes and absorbent pads do more than just tidy — they cut the risk of environmental spillover.
Cleanup Methods: Scoop up solids, bag and seal, label waste. Scrub any residue with mild detergent and water.
Handling: Keep containers closed unless taking or returning product. Avoid skin/eye contact even for fast tasks. If transferring between containers, use funnels and avoid static buildup.
Storage: Prefer cool, dry, well-aired shelves, away from acids, bases, and oxidizers. Avoid heat and direct sunlight. Dedicated chemical cabinets are worth the investment for less-welcoming chemicals like this.
Engineering Controls: Use chemical fume hoods for any large batch work. Laboratories with poor air handling let vapors and dust build.
Personal Protective Equipment: Nitrile gloves fend off skin absorption. Goggles protect against splashes. Long sleeves, closed footwear—the basics matter more than folks care to admit. Face shield for pouring larger volumes.
Work Practices: Never pipette by mouth. Dispose of contaminated gloves and wipes quickly. Wash hands before leaving the bench.
Appearance: White to off-white, fine-grained, attracts moisture if left exposed.
Odor: Slightly sweet, not overpowering but present.
Melting Point: Around 70–75°C.
Solubility: Highly soluble in water and polar organics.
Boiling Point: Decomposes before boiling.
Vapor Density: Not applicable for solids.
Chemical Stability: Stable at room temperature — humidity makes it tacky and can break it down slowly.
Reactivity: Goes wild with strong oxidizers or acids; keep it away from those.
Decomposition Products: Produces nitrogen oxides, bromide fumes, and smaller organics under burning or strong heating.
Acute Effects: Eye, skin, and respiratory irritation. Oral ingestion tends to bring on nausea or cramps. Exact LD50 figures for humans haven’t surfaced, but rodents show trouble with moderate doses.
Chronic Effects: Data from repeated exposure stays limited. Experience suggests allergies can build up with repeated handling.
Routes of Exposure: Absorbs through skin, lungs (if fine mist or dust), and mouth.
Symptoms: Redness, itching, coughing, mild headache.
Aquatic Toxicity: Harms aquatic life, especially at high concentrations, since bromide ions linger in surface waters. Streams and ponds around poorly run facilities often show higher toxicity.
Soil & Air: Doesn’t break down easily—sticks around if not cleaned up.
Bioaccumulation: Tends not to concentrate in tissues over time, but plants and small creatures take a hit before it leaves.
Disposal Methods: Don’t dump in the sink. Dedicated hazardous waste containers with clear labeling matter. Use authorized disposal contractors.
Packaging: Rinse glassware with small volumes of water—add wash to waste. Solid packaging must go in compatible bags or bins; don’t pile with regular lab trash.
Environmental Control: Extra rinse water goes to waste, not the drain.
UN Number: Not classified for transport, but treat as hazardous waste in bulk.
Packaging Group: Not routinely assigned; still, sturdy containers, foam padding, and secondary containment keep bottles from breaking in transit.
Labelling: “Lab Chemicals, Irritant” or similar warning labels do more than satisfy paperwork—they remind folks what’s at stake during a spill.
GHS Classification: Irritant symbol recommended based on skin/eye hazards.
Regulatory Listings: Not broadly regulated, but many local ordinances put it under hazardous chemical storage and handling laws.
Workplace Limits: No established occupational exposure limits, but best to keep a log of use and handling incidents for institutional safety audits. Good lab managers over-document by instinct.
