Abstract
The sorption potential for in humus layer samples from field sites along a deposition gradient was determined experimentally in batch experiments. The Freundlich equation was used to quantify the sorption of added in humus layer samples and to determine site-dependent sorption parameters. sorption in humus layers is a concentration-dependent process. The linearity of isotherms reveals that is reversibly bound in the organic surface layer, as long as soil solution concentrations remain above 26 to 44 mg L−1. Natural isotope variations of sulfur in were analysed to investigate the degree of sorption of dissolved atmospheric and added . Both sulfate species differed significantly in their isotope composition. The pattern of δ34S values for in all equilibrium solutions confirm the findings from sorption isotherms, showing a close relationship between the sulfur isotope ratios of in soil solutions and the amount of sorbed at the humus layer matrix. Stored atmospheric in humus layers is released at sites where sulfate concentration in throughfall drops below 26 mg L−1. Concentration of soluble Fe decreased with increasing sulfate sorption, thus supporting the assumption that active Fe for example is important. Iron probably stabilizes the reactive surface of humus complexes and therefore has a positive influence on the sorption in humus layers.
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