Environmental Engineering Reference
In-Depth Information
with low Hg concentrations or mass. In particular, we are
lacking information on Hg isotope fractionation in water
and the atmosphere, which is of crucial importance when
it comes to regional or even global source tracking of Hg
pollution. Since the instrumental technology seems to be
used already to its maximum potential, future gains will
be possible mainly by processing very large quantities of
samples. To this end, we must optimize quantitative pre-
concentrations methods.
The next frontier is likely the compound-specifi c mea-
surement of Hg isotope ratios. Hg is a prime example for
the need of species-specifi c information. The different Hg
species exhibit vastly different chemical, physical, and toxi-
cologic characteristics. It is therefore expected that isotope
ratio measurements will follow previous analytical and
environmental studies and use species-specifi c measure-
ments to shed more light on the complex Hg biogeochemi-
cal cycle. And lastly, it should be noted that MIF is not only
an academic curiosity, but instead offers enormous poten-
tial for tracking Hg through the ecosystem. Nevertheless,
we are only at the beginning of establishing a theoreti-
cal framework for the Hg isotope system, which has the
unique characteristic of multiple independent fractionation
pathways.
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