How do persistent organic pollutants (POPs) differ from inorganic pollutants in fate and health risk?

• A. POPs degrade rapidly and do not bioaccumulate.
• B. They resist degradation, bioaccumulate, and persist; inorganic pollutants may be mobile but less persistent; both can be toxic.
• C. Inorganic pollutants bioaccumulate more than POPs.
• D. POPs are inorganic and do not pose health risks.

Answer: (B)

The fundamental idea is how fate and health risk differ between persistent organic pollutants and inorganic pollutants. POPs are chemical compounds that are stable in the environment, tend to resist breakdown, and readily accumulate in living tissues. Because they dissolve in fats and move through air and water, they build up in organisms and become more concentrated as they move up the food chain. This persistent presence means long-term exposure and chronic health risks, such as cancer, endocrine disruption, and developmental effects.

Inorganic pollutants, on the other hand, are typically metals or inorganic ions. They can be dissolved and transported readily, making them mobile in air, water, and soil. Their persistence varies with environmental conditions, but they are generally not as resistant to degradation as POPs and don’t bioaccumulate in the same way across many species. They can still be toxic, especially at high concentrations or in sensitive parts of the ecosystem, but the key contrast is that POPs persist and bioaccumulate, while many inorganic pollutants are more mobile and less prone to long-term, ecosystem-wide accumulation.

So the statement that POPs resist degradation, bioaccumulate, and persist, whereas inorganic pollutants may be mobile but less persistent (yet both can be toxic) best captures the common differences in fate and health risk.