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Metal Retention and Transport on Colloidal Particles in the Environment

¹ Department of Environmental Sciences, S-ENETH, ETH-Zurich, CHN F23.2, 9092 Zurich, Switzerland.
E-mail: kretzschmar{at}env.ethz.ch
² Forschungszentrum Karlsruhe, Institut für Nukleare
Entsorgung (INE), Postfach 3640, D-76021, Karlsruhe, Germany.
E-mail: thorsten.schaefer{at}ine.fzk.de

Many potentially toxic trace metals and radionuclides are strongly adsorbed onto surfaces of mineral and organic compounds in soils and sediments, limiting their mobility in the environment. However, recent studies have shown that trace metals in soils, groundwater, rivers, and lakes can be carried by mobile colloidal particles. Understanding the release, transport, aggregation, and deposition of natural colloidal particles is therefore of utmost importance for developing quantitative models of contaminant transport and the biogeochemical cycling of trace metals.

KEYWORDS: colloids, groundwater, radionuclide, soil, trace metal, transport, vadose zone

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