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DISSOLVED ORGANIC CARBON AND SULFATE SORPTION BY SPODOSOL MINERAL HORIZONS
Citation:
Vance, G. AND M. David. DISSOLVED ORGANIC CARBON AND SULFATE SORPTION BY SPODOSOL MINERAL HORIZONS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-93/345 (NTIS PB93229631), 1992.
Description:
Dissolved organic carbon (DOC) can influence the mobility and sorption of inorganic solutes in soils. hrough DOC sorption, surface sites can be inhibited thus preventing the retention of S04 2- entering soils from acidic deposition. o determine the importance of DOC and S04 2- interactions, we examined the sorption of DOC and S04 2- by several mineral horizons of three Spodosols. orption of DOC was found to be comparable between spodic horizons within each Spodosol, although sorption characteristics indicated some differences among soils. ue to the release of large amounts of DOC, analysis of sorption isotherms was characterized by the initial mass isotherm method instead of Langmuir or Freundlich techniques. sing the initial mass isotherm, we found that the carbon reactive soil pools (RSP) corresponded closely to total soil carbon (C,) levels. emperature, however, had little influence on DOC sorption. herefore, soil contact is proposed as the most important factor in controlling terrestrial inputs of both DOC and S04 2- to surface waters.
