Effects of Dissolved Organic Carbon and Sulfate on Aluminum Mobilization in Forest Soil Columns1
- Andrew Evans2
A column study was conducted using a Cecil soil that was leached with various combinations of SO2-4 and dissolved organic carbon (DOC), with the eluent pH adjusted to 4.6. Aluminum mobilization increased in the order SO2-4 < DOC + SO2-4 < DOC with Al being present primarily as Al in the 1000 to 2500 molecular aggregate range (MAR). The addition of SO2-4 to the soil resulted in a reduction in DOC in the <1000 (MAR) with a corresponding increase in the 1000 to 2500 and 2500 to 5000 (MAR). Subsequent leaching with SO2-4 after DOC treatment reduced Al mobilization. The number of pore volumes of eluent required for SO2-4 break-through decreased with elevated DOC levels in solution. Preliminary results suggest that SO2-4 and organic species <1000 (MAR) compete for similar adsorption sites.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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