Which characteristics describe pollutants that bioaccumulate?

• A. Gaseous and non-persistent
• B. Fat-soluble and persistent in environment
• C. Water-soluble and rapidly excreted
• D. Non-persistent solids

Answer: (B)

Bioaccumulation occurs when a chemical is taken up faster than it can be eliminated, so it builds up in an organism over time. The pollutants most prone to this are fat-soluble (lipophilic) and persistent in the environment. Lipid-loving compounds readily partition into fatty tissues and are not easily metabolized or excreted, so they remain in the body and accumulate with ongoing exposure. If a chemical is also persistent, it stays around long enough to continue accumulating across time and through the food chain, leading to higher concentrations in organisms than in the surrounding environment. This combination explains why fat-soluble, persistent pollutants build up, as seen with substances like PCBs or DDT. The other descriptions describe chemicals that are cleared quickly or do not linger, so they don’t bioaccumulate to the same extent.