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1 INTRODUCTION Chlor-alkali plants (CAPs) which use metallic Hg

Chlor-alkali plants (CAPs) which use metallic Hg
for the electrolytic production of chlorine and
caustic soda are potential sources of Hg pollution.
Extensive research on the role of CAPs in regional
Hg cycling has concluded that their contributions are
of particular concern to local and regional areas
(Maserti & Ferrara 1991, Rule & Iwashchenko
1998). The contamination of soils in the vicinity of a
CAP is due to emissions containing elemental Hg
) which can react with metallic oxides and
organic matter (Schuster 1991, Stein et al. 1996). Hg
can be reemitted in the atmosphere especially during
periods of high temperature (Rule & Iwashchenko
1998) or can be oxidized under acidic conditions and
transformed into its bivalent form, Hg2+
(Hempel et
al. 1995). Divalent Hg is a precursor for the
formation of compounds with increased solubility


Source: Aubertin, Michel - Département des génies civil, géologique et des mines, École Polytechnique de Montréal


Collections: Engineering; Environmental Management and Restoration Technologies