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Soil Science Society of America Journal Abstract -

Effects of Dissolved Organic Carbon and Sulfate on Aluminum Mobilization in Forest Soil Columns1


This article in SSSAJ

  1. Vol. 50 No. 6, p. 1576-1578
    Received: Oct 18, 1985

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  1. Andrew Evans Jr.2



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.

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