whose some or most hydrogen atoms have been replaced by chlorine atoms. Chemically and thermally stable
, chlorinated hydrocarbons are used mainly in the manufacture
solvents and insecticides. Their danger
to the environment
comes from their toxicity
, great stability
(persistence in the environment), and propensity to evaporate with water into the atmosphere
. CHCs become concentrated in animal fat and attack
heart and liver; some have anesthetic
of sunlight on chlorinated hydrocarbons forms chlorine monoxide which contributes to breaking-down of the ozone-layer, causing wide 'holes' through which cancer-causing ultraviolet (UV) rays
can reach the earth's surface.
See also chlorofluorocarbon and chlorofluoromethane.