Which environmental property is commonly associated with chlorinated hydrocarbon insecticides such as DDT?

Which environmental property is commonly associated with chlorinated hydrocarbon insecticides such as DDT?

• A. High persistence and bioaccumulation
• B. Rapid environmental degradation
• C. High water solubility
• D. Low toxicity to wildlife

Answer: (A)

Chlorinated hydrocarbon insecticides like DDT are known for their chemical stability and fat-loving nature. Their carbon–chlorine bonds make them resistant to breakdown, so they persist in soils, sediments, and water for long periods. Because they are nonpolar and highly soluble in fats, they accumulate in the fatty tissues of organisms. As they move up the food chain, concentrations increase at each step—a process called bioaccumulation and biomagnification. This combination of long environmental lifetimes and buildup in living tissues is why these compounds are commonly described as persistent and bioaccumulative. Rapid environmental degradation would lessen persistence, and high water solubility would reduce lipid storage and bioaccumulation, so those properties don’t fit. While these compounds can be toxic to wildlife, the question focuses on environmental behavior, and the hallmark is their persistence and tendency to bioaccumulate.

Chlorinated hydrocarbon insecticides like DDT are known for their chemical stability and fat-loving nature. Their carbon–chlorine bonds make them resistant to breakdown, so they persist in soils, sediments, and water for long periods. Because they are nonpolar and highly soluble in fats, they accumulate in the fatty tissues of organisms. As they move up the food chain, concentrations increase at each step—a process called bioaccumulation and biomagnification. This combination of long environmental lifetimes and buildup in living tissues is why these compounds are commonly described as persistent and bioaccumulative.

Rapid environmental degradation would lessen persistence, and high water solubility would reduce lipid storage and bioaccumulation, so those properties don’t fit. While these compounds can be toxic to wildlife, the question focuses on environmental behavior, and the hallmark is their persistence and tendency to bioaccumulate.