Define 'bioaccumulation factor' (BAF) and provide its significance.

Define 'bioaccumulation factor' (BAF) and provide its significance.

• A. BAF measures how quickly a chemical volatilizes.
• B. BAF is the ratio of chemical concentration in an organism to that in the surrounding environment; higher BAF indicates greater bioaccumulation.
• C. BAF applies only to inorganic compounds.
• D. BAF is the ratio of chemical concentration in an organism to that in the surrounding environment; it indicates a chemical's tendency to accumulate in organisms.

Answer: (C)

Biological accumulation is quantified by comparing how much chemical ends up inside an organism to how much is present in the surrounding environment. The bioaccumulation factor is that ratio: concentration in the organism divided by concentration in the environment. This metric captures how readily a chemical builds up in an organism over time through all exposure routes, including water and diet. The significance is that a higher BAF means the chemical tends to bioaccumulate to greater internal levels, which can raise risks to the organism and, through the food chain, to predators and humans. This is why BAF is a key tool in ecological and human health risk assessment.

Biological accumulation is quantified by comparing how much chemical ends up inside an organism to how much is present in the surrounding environment. The bioaccumulation factor is that ratio: concentration in the organism divided by concentration in the environment. This metric captures how readily a chemical builds up in an organism over time through all exposure routes, including water and diet.

The significance is that a higher BAF means the chemical tends to bioaccumulate to greater internal levels, which can raise risks to the organism and, through the food chain, to predators and humans. This is why BAF is a key tool in ecological and human health risk assessment.