Soils and sediments are very important in the attenuation of both toxic and biologically essential elements in the terrestrial and aquatic environments because they contain mineral and humic constituents that have large surface areas and are electrically charged. These surface-active sites include constant negative charge sites, as well as variable charge sites associated with minerals and variable charged negative sites associated with organic materials. Over the past 20 years or so there has been considerable interest in understanding the interfacial chemistry of soils and sediments through the application of both aquatic speciation and surface complexation models.

Interfacial Chemistry of Rocks...

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