The overall aim of the project is: To apply recent developments in the speciation and transport of metals in soils and aquifers to verify predictive models for the long-term fate and transport of metals in metal-contaminated soils and aquifers (here 'metal' includes metalloids such as arsenic). This will improve the scientific basis for assessing the long-term fate and environmental significance of metals in risk assessments. This will be achieved through the following four objectives:
OBJECTIVE A (SPECIATION, UK):
To develop new field and laboratory methods for measuring in situ trace metal speciation in pore waters from metal-contaminated soils and aquifers. The pore water chemistry of water displaced from field-moist soils and aquifer materials will be measured and the free metal ion concentration measured using a novel approach (the Helmke method).
OBJECTIVE B (CHARACTERISATION, FR):
To characterise the physicochemical properties of metal-contaminated soils and aquifer materials that control metal solubility.
The soild and surface chemistry of the soils and aquifer materials will be related to the composition of the pore water measured in Objective A.
OBJECTIVE C (MODELLING, NL):
To develop methods and modelling methodologies for predicting the solubility, speciation and transport of metals and dissolved organic carbon (DOC) in metal-contaminated soils and aquifers.
A model for the release of metals and DOC for metal-contaminated soils and aquifer materials will be developed.
OBJECTIVE D (TRANSPORT, CH):
To use laboratory column studies to verify transport models in contaminated soils and aquifers and to explore soil and aquifer treatments on metal mobility.
Metal breakthrough and leaching experiments will be conducted under a wide range of experimental conditions. The-transport data will be compared with model predictions based on the results of A to C above.
Two contaminated sites will be sampled for each of the four participating countries and subsamples distributed to each laboratory.
Funding SchemeCSC - Cost-sharing contracts
6703 HB Wageningen