Recently in Lombardia, Italy, a water contamination
by industrial wastes was discovered in an area
where an uncontrolled industrial development had
taken place. The subject of this paper is a case
history
of pollution by polychloro-1,3-butadiene congeners,
a class of 35 volatile or semivolatile chlorinated
compounds still in the presence of other compounds
arising from a different source. By comparison of
a sample taken from the bottom fraction of a rectification
column for the production of tetrachloroethene with
the carbon disulfide extract of a water sample
collected from a well of the municipal water supply
of Milan, the source of pollutants was inferred. The
extent of pollution was monitored by liquid−liquid microextraction of the water of 24 wells sited in the
north, along the prevailing direction of the movement
of the underground water, using hexachloro-1,3-butadiene as a marker. The uncertainty of the
normative
now in force in the assessment of the risk connected
with the occurrence of these compounds in drinking
water is also discussed.
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