Zusammenfassung
Bioavailability considerations are one of the tools for a proper assignment
of sites potentially and actually at risk as it allows assessing
both the extent (hazard) and probability (risk) of adverse effects.
In this paper, bioavailability considerations are linked to physicochemical
methods available for assessing metal fractions in soils. The focus
of the overview is on empirical methods for extraction of
metals from soils as a surrogate for the metal-, species- and soil-type-dependent
bioavailable and bioaccessible metal pools. This
cumulates in a generalized flow chart for monitoring of metals in
soils. In support of the general monitoring strategy, examples are
given
of successful applications of analytical methods for predicting metal
uptake by plants and animals, for assessing the origin of metals
in
soils, as well as the leaching potential of soils and the extent of
soil contamination. It is concluded that a large arrays of chemical
assessment methodologies for metal speciation in solid and liquid
soil phases are available. As most assessment methodologies are
operationally defined instead of being functionally defined, examples
of mechanistically based monitoring approaches of bioavailability
are still scarce. The value of the methods for measuring bioavailability
can be significantly improved when the species, metal, and soil
specific aspects of bioavailability are more accurately taken into
account in the design of chemical simulation methodologies.
Nutzer