Abstract
Oxides and oxyhydroxides of iron and aluminum are important sorbents for heavy metal cations in aquatic and terrestrial environments. The sorption of metal cations has therefore been subject of many investigations. In the majority of studies, sorption of single metals as a function of pH and electrolyte concentration has been investigated. Little information is available on competitive sorption effects between strongly sorbing metal cations. This information is essential, however, if surface complexation models are to be applied successfully to more complex, multi-component systems such as contaminated soils or sediments. The objectives of the present study were to (i) investigate competitive sorption effects between two strongly sorbing heavy metals, Cu 2+ and Pb 2+, to colloidal hematite (~Fe203) particles, and (ii) to test various surface complexation models for there ability to predict competitive sorption from acid-base titration and single-metal sorption data.
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