Which document category helps responders determine the chemicals present at a lab incident?

• A. Safety data sheets
• B. Emergency contact list
• C. Chemical inventory list
• D. Incident log

Answer: (C)

Knowing what chemicals are on site is essential for assessing risk, choosing protective actions, and planning containment during a lab incident. The chemical inventory list is the organized record of all chemicals stocked or stored in the lab, including names, quantities, and storage locations. With that list, responders can quickly identify which substances could be involved, then consult hazard information and implement appropriate controls. Safety data sheets provide hazard details for identified substances, but they don’t by themselves tell you everything that’s present in the lab at that moment. An emergency contact list helps notify people, and an incident log records events and actions, not the current chemical identities. The inventory list directly identifies the chemicals present, making it the best resource for determining what’s in the lab during an incident.