Spill Response
Part of Acids and Alkalis
Step-by-step protocols for responding to acid and alkali spills — on skin, eyes, surfaces, and floors — without modern emergency equipment.
Why This Matters
Speed is everything in a chemical spill. The difference between a minor irritation and permanent tissue damage is often measured in seconds. The correct response — large amounts of water, immediately — is simple and requires no special equipment, but it must be automatic. In the shock and confusion of an accident, people often hesitate or reach for the wrong response.
Equally important: knowing what NOT to do. The instinct to apply a neutralizing substance (put vinegar on a lye burn, baking soda on an acid burn) is widespread and genuinely dangerous. Neutralization reactions generate heat — heat that adds to the existing chemical burn. Medical knowledge in a rebuilding community may be limited; this article provides protocols that work correctly even when nothing else is available.
Every person who works with or around acids and alkalis should read this article before their first contact with these materials. Post a summary in your chemistry workspace where it can be read in an emergency.
Body Exposure Response
Skin Contact
Act immediately — do not wait to assess severity.
- Flood with water. Use the nearest large source — bucket, barrel, stream, rain cistern. Pour continuously over the affected area. Do not wipe or rub.
- Keep rinsing for 15–20 minutes. This is non-negotiable. Most people stop too soon. Set someone to count the time if possible.
- Remove contaminated clothing. While rinsing, have a second person cut or pull off any clothing that was contacted by the chemical. This includes shoes if feet were contaminated. Clothing continues exposing skin to chemical if left in place.
- Continue rinsing after clothing removal. Once clothing is removed, resume rinsing the now-exposed skin for the full 15–20 minute period.
- Assess the injury. After thorough rinsing, the area may appear red, white, or blistered. Treat as a thermal burn of equivalent severity.
Do not neutralize
Do not apply vinegar to a lye burn. Do not apply baking soda to an acid burn. Neutralization reactions produce heat that worsens the burn. Plain water is the only correct treatment.
Eye Contact
Eye exposure is a medical emergency. Permanent vision loss can occur within minutes from strong acids or alkalis.
- Immediately flood the eye with water. Tip the head so the affected eye is lower than the other. Pour water continuously across the open eye, allowing it to run out the side.
- Hold the eye open. The instinct is to close it. A helper may need to hold eyelids apart to ensure adequate rinsing.
- Rinse for 20–30 minutes. Longer than skin exposure — the eye has no protective outer layer.
- Do not rub the eye. Rubbing spreads the chemical across a larger surface area of the eye and may cause mechanical damage.
- After rinsing, keep the eye covered with a clean, wet cloth. This protects the eye and reduces light sensitivity while you move the person to any available medical help.
- Treat as a priority medical case. Eye burns from concentrated chemicals are serious injuries.
Ingestion
If someone has swallowed acid or alkali:
- Do not induce vomiting. Corrosive substances cause as much damage coming back up as going down, and vomiting risks aspiration into the lungs.
- Give water to drink — small sips only. A few hundred mL of water helps dilute the chemical. Do not give large amounts, as this can cause vomiting.
- Do not give milk, oil, or other substances. These are folk remedies that do not help and may interact with the chemical.
- Seek all available medical help immediately. Chemical ingestion is life-threatening.
Surface Spill Response
Small Spill (under 1 liter)
Acid spill on floor or bench:
- Clear all people from the area.
- Apply dry absorbent material: sand, dry soil, sawdust, wood ash. Do not use paper — it disintegrates in acid.
- Allow absorbent to soak up the liquid for 2–5 minutes.
- Scoop up the absorbed material with a shovel or stiff brush into a bucket.
- Rinse the affected surface with large amounts of water.
- Mop or rinse again until the surface shows no color change with indicator paper.
Alkali (lye) spill on floor or bench: Same procedure. Dry sand or sawdust absorbs lye equally well. After removing the bulk of the material, rinse with water thoroughly.
Large Spill (over 1 liter)
Large spills require more caution because the volume of material is sufficient to cause serious injuries on contact, and vapors from hot concentrated acids can fill a room.
- Evacuate the area immediately. Remove all people — the chemist responds last, from the doorway.
- Ventilate. Open all windows and doors. If the spill is indoors, allow 10–15 minutes for vapors to dissipate before entering. Stand upwind.
- Protect yourself fully before re-entering. Leather gloves, apron, eye protection, and ideally a damp cloth over the nose and mouth.
- Dam the flow. Use dry sand, clay, or soil to build a low barrier preventing the spill from flowing into floor drains, waterways, or other chemical storage areas.
- Apply absorbent. Cover the full spill with dry sand or soil. Apply generously.
- Remove absorbed material. Shovel into dedicated waste containers.
- Rinse the area repeatedly. Use large volumes of water. Test with indicator paper after rinsing — if the floor still shows strong acid or alkaline reaction, continue rinsing.
Spill Kit: What to Keep Ready
Maintain a basic spill kit near your chemistry workspace:
| Item | Purpose |
|---|---|
| Large bucket of water (20+ liters) | Emergency body rinse |
| Smaller bucket of water | Eye rinse |
| Bag of dry sand or soil (10+ kg) | Absorbent for spills |
| Leather gloves and apron | Protection for cleanup |
| Eye protection | Protection for cleanup |
| Shovel or stiff brush | Moving absorbed material |
| Waste bucket with lid | Collecting contaminated absorbent |
| Indicator paper strips | Testing surface after cleanup |
Inspect and replenish this kit at the start of each working session. The water bucket especially needs regular refreshing to stay clean.
Spill on Equipment and Stored Materials
On Leather Tools or Protective Gear
Immediately rinse with large amounts of water. Leather contaminated with strong lye will be damaged over time even after rinsing — the outer surface may harden and crack. After thorough rinsing, re-treat with tallow while still damp to restore some flexibility. Discard if the leather shows structural degradation.
On Metal Tools
Acid attacks metal rapidly. Rinse immediately, then dry thoroughly. Apply a thin coat of rendered fat to prevent corrosion of iron tools. Check the surface after cleaning — acid pitting that is not addressed will continue to spread.
On Stored Food or Water
Any food or water that has been contaminated by acid or alkali spill must be assumed unsafe. The primary concern is not pH — even a strong alkali can be neutralized — but the possibility of secondary contamination from dissolved metals, impurities, or reaction products. Discard contaminated food. Contaminated water can be pH-adjusted and tested but may have dissolved contaminants; use for non-food purposes only unless you have evidence of its safety.
Post-Incident Review
After any spill incident, conduct a brief review:
- What caused the spill? (Container failure, overloaded shelf, working too fast, distraction)
- Was the response fast and correct? (Any hesitation? Did anyone attempt to neutralize instead of rinse?)
- Is the storage or working arrangement adequate? (Was secondary containment in place? Did it work?)
- What changes will prevent recurrence?
Record the incident and lessons in your community’s chemistry records. Patterns of incidents point to systemic problems — inadequate containers, poor labeling, insufficient training — that need systematic fixes.