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Release of Natural Organic Matter Sorbed to Oxides and a Subsoil

^a Institute of Soil Science and Soil Geography, University of Bayreuth, D-95440 Bayreuth, Germany

View larger version (22K): [in a new window]   Fig. 1 Sorption of organic carbon (OC) to amorphous Al(OH)3, goethite, and the 3Bw horizon of an Oxyaquic Dystrochrept and the subsequent desorption by a solution of the same inorganic composition as the sorption solutions but without dissolved organic carbon (DOC). Sorption is given as the relationship between added and sorbed OC (initial pH = 4.0; ionic strength = 0.002 M)

View larger version (18K): [in a new window]   Fig. 2 Release of organic carbon (OC) freshly sorbed on amorphous Al(OH)3, goethite, and the 3Bw horizon of an Oxyaquic Dystrochrept by varying concentrations of NaCl (initial pH = 5.4)

View larger version (24K): [in a new window]   Fig. 3 Release of organic carbon (OC) freshly sorbed on amorphous Al(OH)3, goethite, and the 3Bw horizon of an Oxyaquic Dystrochrept by varying concentrations of Na2SO4 and NaH2PO4 (initial pH = 5.2)

View larger version (19K): [in a new window]   Fig. 6 Variation of the zeta potential () of amorphous Al(OH)3 and goethite particles with increasing amounts of sorbed NOM (pH = 6.1; ionic strength = 0.002 M)

View larger version (23K): [in a new window]   Fig. 4 Release of organic carbon (OC) freshly sorbed on goethite and the 3Bw horizon of an Oxyaquic Dystrochrept at varying pH values

View larger version (31K): [in a new window]   Fig. 5 Sorption and desorption of organic carbon (OC) on amorphous Al(OH)3, goethite, and the 3Bw horizon of an Oxyaquic Dystrochrept. The sorption is given as the relationship between added and sorbed OC. The bars indicate subsequent desorption by different solutions for each dissolved organic carbon (DOC) addition. As the soil material contained indigenous OC, a line is given showing the course of soil OC content

View larger version (37K): [in a new window]   Fig. 7 Release of organic carbon (OC) sorbed on amorphous Al(OH)3 and goethite by 0.1 M Na2SO4 and 0.1 M NaH2PO4 at different times after the sorption. The time given on the x-axis is the residence time of the OC on the sorbent prior to the desorption. Error bars represent the standard deviation of three replicates

View larger version (40K): [in a new window]   Fig. 8 Sorption and desorption of the hydrophilic and hydrophobic organic carbon (OC) fraction on amorphous Al(OH)3 and goethite. The sorption is displayed as the relationship between added dissolved organic carbon (DOC) and sorbed OC. The bars indicate subsequent desorption by different solutions for each addition