Metal retention in a thin karstic soil, Christian County, Missouri |
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Authors: | L Shepard M Gutiérrez |
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Institution: | (1) Department of Geography, Geology and Planning, Southwest Missouri State University, Springfield, MO 65804, USA, US |
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Abstract: | The response of a Wilderness cherty loam series soil to repeated dosages of metals (as sewage sludge) using a two-step sequential
extraction procedure was investigated. Variations in metal content between amended and control soils were related to organic
matter, clay content, and clay mineralogy. Of the four metals investigated, Cu was found to accumulate in the top 20 cm of
amended soils; Pb and Zn were present in even smaller amounts with respect to the control soils, and Cr concentrations were
unaffected with respect to both depth and amendment. None of the metals indicated accumulation in deeper (>20 cm) parts of
the soil profile. Overall, results suggest that the metals remobilize in the top 20 cm, being readily uptaken by the fescue
grass growing in this lot. Precipitation of insoluble forms of metal into deeper parts of the soil profile was proven unlikely
based on the distribution of metal concentrations throughout the profile.
Received: 15 December 1997 · Accepted: 23 March 1998 |
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Keywords: | Karst Heavy metals Soil contamination Sequential extraction |
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