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Title: The Use of Leaching Tests to Study the Potential Mobilization of Heavy Metals from Soils and Sediments: A Comparison
Authors: Cappuyns, ValĂ©rie ×
Swennen, Rudy #
Issue Date: 4-Jan-2008
Publisher: D. Reidel Pub. Co
Series Title: Water, Air and Soil Pollution vol:191 pages:95-111
Abstract: In the present study, different leaching tests
were applied on well-characterised samples in order
to obtain information on the potential mobility of
heavy metals and arsenic. The information deduced
from the different methods was compared and
evaluated. Besides the comparison of heavy metal
release in cascade-, column- and pHstat leaching tests,
attention was also paid to the assessment of release
kinetics during leaching tests and to the mathematical
modelling of leaching behaviour. The aim of this
study was to understand the origin of possible
discrepancies between the results of different leaching
tests. The compatibility of the results of different
leaching tests is, besides the inherent differences
between methods (single batch tests versus dynamic
leaching tests, the duration of the tests, liquid/solid
(L/S) ratio,…) to a major extent determined by keyfactors
such as pH and redox potential. Depending on
soil and sediment properties (e.g. acid neutralizing
capacity (ANC)) these ‘key-factors’ varied during and
at the end of extractions and leaching tests, even when
the initial test conditions (e.g. the pH of the reagent)
were equal for all test cases. During cascade- and
column leaching tests, pH (which is initially 4) will
mostly increase, but the extent of this pH-increase
mainly depends on the acid neutralizing capacity of
the sample. Therefore, measuring the pH of all
leachates that are collected during these tests is
mandatory for the interpretation of the results.
Moreover, the monitoring of other variables such as
DOC, anions and major elements can give indications
on the reactions that are responsible for the release of
elements (e.g. the dissolution of organic matter) and
greatly improve the interpretation of the results.
ISSN: 0049-6979
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Department of Earth and Environmental Sciences
Division of Geology
Research Centre for Economics and Corporate Sustainability, Campus Brussels
Faculty of Economics and Business (FEB) - miscellaneous
× corresponding author
# (joint) last author

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