Which approach uses liquid reactions and indicators to identify hazards at hazmat scenes?

• A. Dry chemistry
• B. Wet chemistry
• C. Spectroscopy
• D. Immunoassay

Answer: (B)

Wet chemistry is about using liquid reagents that react with the sample and watching for color changes or other indicators. At hazmat scenes, responders mix a small amount of the unknown material with liquid reagents and look for visible signals—such as a color change, precipitation, or gas release—that point to certain chemical features or hazard classes. This approach is fast, portable, and simpler on scene, making it ideal for rapid screening and guiding initial actions like isolation, decontamination, and sampling. It differs from dry chemistry, which uses solid reagents on test pads with no liquid reactions; spectroscopy, which relies on measuring light interactions with the material using instruments; and immunoassays, which detect substances via antibody-based assays rather than general chemical indicator reactions.