Dichlorodiphenyltrichloroethane; a colourless organic crystalline compound, (ClC6H4)2CH(CCl3), made by the reaction of trichloromethanal with chlorobenzene. DDT is the best known of a number of chlorine-containing pesticides used extensively in agriculture in the 1940s and 1950s. The compound is stable, accumulates in the soil, and concentrates in fatty tissue, reaching dangerous levels in carnivores high in the food chain. Restrictions are now placed on the use of DDT and similar pesticides.
Subjects: Science and Mathematics.