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Title:
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Recent developments towards standardisation in geochemical modelling of leaching processes
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Author(s):
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Published by:
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Publication date:
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ECN
Environment & Energy Engineering
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29-5-2012
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ECN report number:
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Document type:
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ECN-M--12-033
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Conference Paper
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Number of pages:
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Full text:
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7
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Download PDF
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Abstract:
Since geochemical modelling is increasingly being used to support the development of environmental
policy and regulatory limit values for contaminants in waste and construction materials that are
utilised or landfilled, it is mandatory to ensure that model predictions are transparent and reproducible,
and that uncertainties are analysed and quantified. In addition, it is important to ensure that model
input parameters are quantified in a standardised manner. Present geochemical models in which
sorption to multiple reactive surfaces is considered (so-called multi-surface models) rely strongly on
input parameters for reactive mineral and organic surfaces. Extraction procedures have been
developed and/or selected from the literature that are believed to be the most selective for the
quantification of amorphous and crystalline iron(hydr)-oxides, amorphous aluminium(hydr)oxides and
humic substances in both the soil and soil solution. These procedures are in development as
international standards by ISO TC190 “Soil Quality” and are currently published as “Final Draft
International Standards” in the ISO/FDIS 12782-series “Soil quality - Parameters for geochemical
modelling of leaching and speciation of constituents in soils and materials”, Part 1-5. In addition, a
new work item is prepared for a standard to provide guidance on the use of the ISO/DIS 12782 input
parameters in the geochemical modelling of leaching processes. Because of their applicability to other
materials than soil and soil materials, as will be demonstrated at the conference, these draft standards
are also being considered for adoption by CEN TC292 (waste) and CEN TC351 (construction
products). These developments in standardisation will be further detailed and illustrated with examples
at the conference, and common principles and differences in applications to contaminant leaching
from waste, construction materials and soils will be addressed.
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