Nitric Acid Incident
A
researcher was cleaning a piece of glassware with nitric acid/water. The
researcher poured the waste nitric acid/water into a 250 ml brown glass
container labeled as waste and sealed the bottle. The researcher did not
know what the contents of the waste container were prior to adding the
waste nitric acid/water. This container was placed near the front edge of
the fume hood. This container developed pressure and exploded. A 1 L
container of 70% nitric acid, a 250 ml container of 1-Hexene and another
unknown brown glass chemical container were shattered by the exploding
waste container. The flammable vapors found an ignition source and caught
fire inside of the fume hood. The container of 1-Hexene was blown out of
the fume hood, shattered and landed on the floor next to the piece of
equipment and caused the cooler and other combustibles to burn. It is
unknown how the 1-hexene started to burn. By the time the Fire Department
arrived, the fuel sources for both fires were mostly used up and the fires
had partially extinguished. It was later determined that the brown waste
bottle possibly contained cyclohexane and sodium metal.
Lessons Learned:
- Never add any water to an unmarked container.
- Label everything with the common chemical name.
- Always attach your waste label before you add the waste and fill it out completely and accurately. It is important to follow the directions on the back side of the chemical waste
label. Chemical Waste Labels are provided by DEHS free of charge.
- Do not use glass to store chemical waste.
If you have any questions please contact the Chemical Hygiene Officer at dehsafety@udel.edu or call 302-831-8475.