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Two-Dimensional Visualization and Quantification of Labile, Inorganic Plant Nutrients and Contaminants in Soil

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Geochemical parameters influencing tungsten mobility in soils.

A J Bednar¹, W T Jones, R E Boyd

¹U.S. Army Engineer Research and Development Center, Environmental Lab., 3909 Halls Ferry Rd., Vicksburg, MS 39180, USA. Anthony.J.Bednar@erdc.usace.army.mil

Journal of Environmental Quality

|January 8, 2008

Summary

Tungsten mobility in soil is influenced by its speciation, forming various tungstate and polytungstate compounds. Over time, these species change, leading to decreased tungsten mobility in the soil environment.

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Area of Science:

Environmental Science
Geochemistry
Toxicology

Background:

Tungsten biogeochemistry and mobility are gaining attention due to potential health impacts, including cancer clusters.
Tungsten exists as soluble tungstate anions but can form polymers with variable properties.

Purpose of the Study:

To determine geochemical parameters for tungstate species in a model soil.
To understand the potential for tungsten mobility and how speciation affects it over time.

Main Methods:

Spiking a model soil with metallic tungsten.
Leaching soluble tungsten with deionized water over time.
Determining partition coefficients for tungstate and polytungstate compounds.

Main Results:

High equilibrium concentrations of soluble tungsten (>150 mg/L) were reached rapidly.
Partition coefficients increased significantly (3-6 fold) over four months.
This indicates a decrease in tungsten mobility as the soil ages.

Conclusions:

Tungsten speciation in soil is dynamic and changes over time.
These speciation changes directly impact tungsten's geochemical behavior and mobility.
Aging of soil leads to reduced tungsten mobility, likely due to polymerization and altered speciation.