Chlorinated aliphatics
This group comprises a number of well known contaminants 
e.g. Tetrachloroethylene (PCE), Trichloroethene (TCE),
1,1,1-Trichloroethane (TCA), 1,1-Dichloroethene (DCE),
Carbon tetrachloride, Chloromethane, Dichloromethane,
and Tetrachloromethane.
These compounds have been of major concern for many years 
among environmental authorities, since some of them are
suspected human carcinogens, especially Trichloroethene
(TCE), while others i.e. 1,1,2,2-Tetrachloroethane and
one of the metabolites from the degradation of TCE, Vinylchlorid,
are known potent human carcinogens. They are widespread
compounds deriving from a number of industrial processes,
i.e. metal degreasing, dry cleaning operation, polymer
manufacturing, etc. At the same time they are rather mobile
in water having low log Kow values, and they are, in contrast
to many other organic contaminants, very slowly degraded
under aerobic conditions. In addition, they are relatively
volatile, which often cause indoor climate problems.
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