Even the most meticulous laboratory can face a spill. How you respond in the first few minutes determines whether a minor accident stays minor or becomes a serious incident. Whether you work in a research lab, a biotechnology facility or a clinical diagnostics laboratory, the principles are the same: protect people, contain the hazard, clean up properly, and learn from what happened.

Immediate Response: Assess, Alert, Act

As soon as a spill occurs, stop what you are doing. Do not rush in. Assess the situation from a safe distance. Ask yourself: what chemical is involved? How much has spilled? Is it volatile, corrosive, toxic or flammable? Are there any injured people? If the substance is unknown, or if it poses an inhalation risk, evacuate the immediate area and close the door behind you.

For a small spill of a low-hazard substance, you may be able to tackle it yourself, provided you have the right personal protective equipment (PPE) and spill kit to hand. For anything larger than a litre, or any spill of a highly toxic, volatile or corrosive material, evacuate the room and alert others. Use the laboratory's emergency alarm or notify colleagues verbally. Never attempt to clean up a spill that puts you at risk.

Spill Kits: Know Your Inventory

Every laboratory should have spill kits appropriate to the substances used. A general-purpose kit typically contains absorbent pads, pillows or socks, granular absorbent such as vermiculite, a dustpan and brush, waste bags, disposable gloves, safety goggles and a face mask. Specialised kits exist for acids, bases, solvents, mercury and biological materials.

• Acid spills: neutralise with sodium bicarbonate or calcium carbonate, then absorb.
• Base spills: neutralise with citric acid or a commercial neutraliser.
• Solvent spills: use inert absorbent, avoid sparks, ensure ventilation.
• Mercury spills: use a mercury spill kit with sulphur or zinc powder, never a vacuum cleaner.
• Biological spills: cover with paper towels, apply a suitable disinfectant, leave for the required contact time, then clean.

Check your kits regularly. Replace used items, and note expiry dates on neutralisers and disinfectants. Store kits near the areas where spills are most likely, not locked away in a distant cupboard.

Safe Clean-Up and Waste Disposal

Put on appropriate PPE before you start. Work from the outside of the spill inwards to avoid spreading the material. Use absorbent socks to contain liquids, then apply neutraliser or absorbent granules. Never use water to wash a chemical spill down a sink unless you are certain it is safe and permitted — many substances react violently with water or are prohibited from drain disposal.

Once absorbed, scoop the material into a suitable waste container. Label it clearly with the chemical name, concentration and hazard. In the UK, chemical waste must be segregated and consigned to a licensed waste contractor. Clinical and biological waste goes into the appropriate clinical waste stream, often autoclaved or incinerated. Never mix incompatible wastes.

After clean-up, ventilate the area, decontaminate surfaces, and wash your hands thoroughly. Remove PPE carefully to avoid contaminating yourself.

Reporting and Review

Every spill, however small, should be reported internally. Complete an incident report or near-miss form, detailing what happened, what was spilled, how it was handled and any injuries or exposures. In the UK, some incidents may be reportable under RIDDOR (Reporting of Injuries, Diseases and Dangerous Occurrences Regulations) if they result in injury or a dangerous occurrence. Your safety officer will advise.

Reporting is not about blame. It is about identifying weaknesses — inadequate storage, a missing spill kit, insufficient training — so they can be fixed. Review the relevant COSHH assessment and update it if necessary. Share lessons learned with the team during safety meetings.

Preventing Future Spills

Prevention is always better than cure. Store chemicals in secondary containment trays or cabinets, especially liquids. Keep only the minimum quantity you need. Use trolleys when moving large bottles, and never carry chemicals up stairs without a carrier. Label everything clearly, including decanted solutions.

Train your team regularly. Run spill drills so everyone knows where kits are, how to use them, and when to evacuate. Check that eyewash stations and safety showers are accessible and working. Review your COSHH assessments annually or whenever procedures change.

A calm, well-rehearsed response turns a potential crisis into a manageable event. By preparing properly, you protect your colleagues, your research and your laboratory's reputation.