U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings
of the Technical Meeting, Colorado Springs, Colorado, September 20-24, 1993,
Water-Resources Investigations Report 94-4015
Experimental Studies of Trace-Metal Partitioning in Perennial
Reaches of Pinal Creek, Arizona
by
Christopher C. Fuller (U.S. Geological Survey, Menlo Park, Calif.)
Abstract
Development of solute transport models to predict the fate of metal contaminants
in Pinal Creek will require quantification of the reactions controlling
metal partitioning. Manganese oxides are thought to control dissolved trace-metal
concentrations in the perennial flow of the creek. However, these process
are not adequately characterized. Laboratory experiments under geochemical
conditions relevant to Pinal Creek using field-derived materials are proposed
to evaluate metal uptake by coprecipitation with manganese during oxidation
and precipitation of manganese oxides and by adsorption onto absorbent phases
present in the streambed sediments. The reversibility of the metal sorption
by these processes also will be investigated.
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