Which of the following is a method of controlling vapors during a spill?

• A. Adsorption
• B. Compression
• C. Solid blockage
• D. Epoxy sealing

Answer: (A)

Adsorption is the correct choice because it involves the process of adhering molecules from a gas or liquid to the surface of a solid. In the context of controlling vapors during a spill, adsorbents are materials that can capture and hold onto vapor molecules, effectively reducing their concentration in the air. This process not only helps in containing harmful vapors from spreading but also aids in minimizing exposure to hazardous substances for both responders and the surrounding environment.

Materials used for adsorption can include activated charcoal or specific clays, which are highly effective due to their large surface area and porous nature. These materials can be deployed around the spill site to capture and control vapors, making the area safer for remediation efforts.

The other methods may have limited applications or may not effectively control vapors. For instance, compression and solid blockage primarily deal with liquids and may not be suitable for gas or vapor containment, while epoxy sealing is more related to sealing containers or areas rather than directly controlling vapor dispersion.