© 2026 Nanjing Finechem Holdings Co., Ltd,
All Right Reserved
Name: Anhydrous Acetonitrile
Chemical Formula: C2H3N
Common Uses: Laboratory solvent, pharmaceutical production, battery electrolytes, DNA synthesis
Acetonitrile often shows up in research spaces due to its capacity as a polar aprotic solvent, dissolving both salts and organics effectively. This puts it front and center in biochemical labs, chemical manufacturing sites, and cleanup operations requiring quick separation or solvent exchanges.
Main Hazards: Flammable, toxic if inhaled or ingested, harmful upon skin contact
GHS Classification: Flammable liquids, Acute toxicity—oral, skin, inhalation; Serious eye irritation
Exposure leads to symptoms like dizziness, nausea, weakness, laboratory exposures showing even delayed symptoms as its metabolite cyanide takes effect. Flammable vapors can travel to ignition sources, making a small spill more dangerous than expected in busy workspaces.
Chemical Identity: Acetonitrile
Purity: Typically exceeds 99%, especially in analytical applications
Multiple impurities can contribute to the risks if handled carelessly, but most commercial lots purposely minimize water and other volatile organic traces, focusing on the risk posed by the acetonitrile itself more than anything else.
Ingestion: Rinse mouth, seek immediate medical attention—delayed symptoms are common
Inhalation: Move to fresh air, provide oxygen, consult healthcare professionals right away
Skin Contact: Remove contaminated clothing, rinse skin thoroughly with water for several minutes
Eye Contact: Flush eyes with running water for several minutes—don't skip medical follow-up
Many who've worked with acetonitrile recognize the risk of underestimating mild exposures, as cyanide formation can create a delayed spiral into toxicity. Quick action makes the difference between a manageable scare and a major injury in a research or production environment.
Suitable Extinguishing Media: Foam, dry chemical, carbon dioxide
Hazards in Fire: Toxic gases such as hydrogen cyanide, nitrogen oxides, carbon monoxide
Protective Equipment: Full firefighting gear, self-contained breathing apparatus
Small lab fires with acetonitrile can escalate, so experienced teams use caution and evacuate unless equipped. The average worker soon learns that ordinary water can spread volatile vapors and worsen the situation, so foam and specialized agents outperform standard extinguishers.
Personal Precautions: Evacuate area, wear chemical-resistant gloves, safety goggles, lab coat
Environmental Precautions: Prevent entry into drains or water streams
Cleanup: Absorb with inert material, ventilate space, collect in compatible containers
During my graduate work, spills of acetonitrile proved the importance of a well-rehearsed spill response—swift removal of ignition sources and quick control over splatter or splashes made all the difference in maintaining a low-risk space in cramped lab aisles.
Handling: Use in vented hoods, avoid inhaling vapors, prevent static discharge
Storage: Keep in tightly closed containers, store in cool and well-ventilated spots
Personal experience shows that returning containers to chemical-safe storage cabinets and actively labeling stocks reduces risk. Training new researchers to keep flammables in appropriate lockers and separate from incompatible substances like acids has proven essential to overall lab safety.
Engineering Controls: Chemical fume hoods, exhaust fans
Personal Protective Equipment: Impermeable gloves, splash-resistant goggles, flame-resistant lab coats
Workplace Exposure Limits: Occupational exposure limits vary, most publications set Time-Weighted Average at or below 40 ppm
Labs with strong safety cultures prioritize fume hoods and regular calibration of sensors. Personal gear acts as the last line of defense against acetonitrile exposure, not the first—treating gloves and goggles as essentials, not options, keeps risky contact down to near zero.
Appearance: Clear, colorless liquid
Odor: Faint, ether-like
Boiling Point: Around 82°C
Flash Point: 2°C (closed cup)
Vapor Pressure: Around 73 hPa at 20°C
Solubility: Miscible with water and most organic solvents
Acetonitrile’s volatility draws both caution and respect—a slight rise in room temperature produces a noticeable jump in airborne levels. Its rapid evaporation can dry glassware but just as easily fill a poorly ventilated lab with flammable vapor, so physical properties drive every safety conversation in shared facilities.
Stability: Chemically stable under recommended storage
Incompatible materials: Strong acids, bases, oxidizing agents
Hazardous Decomposition Products: Hydrogen cyanide, nitrogen oxides, carbon monoxide
Many learn quickly to avoid risky mixes: accidental blending with powerful acids during waste cleanup led to aggressive fumes that required a full lab evacuation in my early days. Trainers drill into newcomers that containers must never be left uncapped, and reactive wastes go into segregated disposal bins every time.
Routes of Exposure: Inhalation, ingestion, skin and eye contact
Symptoms: Headache, weakness, nausea, abdominal pain, confusion; high doses: rapid breathing, convulsions, potential death
Target Organs: Central nervous system, liver, cardiovascular system
Chronic exposure stories circulate in academic circles—headaches, irritability, or stomach distress send seasoned researchers back to the fume hood after poor practice catches up. NIOSH and WHO documents underline the compound’s ability to cause delayed effects; prepared teams scan for subtle symptoms even after a small incident.
Aquatic Toxicity: Harmful to aquatic organisms
Persistence and Degradability: Moderate, some breakdown in air and water
Bioaccumulation: Limited for most organisms
Lab waste poured down the drain set back environmental safety years ago, but present regulations force careful collection and treatment. Students working with environmental monitoring learn that minute traces escaping into streams disrupt fish and microbes, reminding everyone about the real-world impacts beyond the lab’s four walls.
Preferred Disposal Method: Incineration at government-approved facilities
Avoid: Pouring down drains or regular trash
Solvent disposal remains a hot topic for both regulatory and ethical reasons. The routine of collecting used acetonitrile in labeled carboys, scheduled for professional pickup, drives home the message that protecting the broader ecosystem matters as much as personal safety. In conversations with chemists, stories surface about practices in the past and how much tighter the standards have become under environmental law.
UN Number: 1648
Transport Class: Flammable liquid
Packing Group: II
Moving acetonitrile across campus or between facilities raises anxiety for good reason—one jolt or dropped container can mean immediate danger. Transport rules demand sturdy packaging, clear placards, and a web of paperwork—a reality that drives home how uncommon it is for a single chemical to command so much attention at every step of its movement.
Workplace Regulations: OSHA, ACGIH, and EU rules all treat acetonitrile as a hazardous substance
Labelling Requirements: Hazard statements, proper warnings, and safety pictograms
Reporting Obligations: Quantities tracked and reported to environmental authorities in many states and EU countries
Lab managers invest significant time training staff each year, because mistakes trigger regulatory action, monetary penalties, and reputational damage. The focus on compliance shifts lab culture for the better: clear communication, frequent training refreshers, and open-door policies for reporting near-misses support fewer hazardous incidents and a healthier work environment.
