containment

https://doi.org/10.1351/goldbook.15594
Process by which possible release, discharge, or spill of a toxic substance during normal use or after an accident is prevented by appropriate action.
Source:
PAC, 2007, 79, 1153. (Glossary of terms used in toxicology, 2nd edition (IUPAC Recommendations 2007)) on page 1197 [Terms] [Paper]