Details zur Publikation

Referenztyp Zeitschriften
DOI / URL Link
Titel (primär) Isotope studies to the sorption behavior of atmospheric sulfate in humus layers of Scots pine ecosystems
Autor Schulz, H.; Neue, H.-U.;
Journal / Serie Isotopes in Environmental and Health Studies
Erscheinungsjahr 2005
Department BOCHE; BOOEK;
Band/Volume 41
Heft 1
Sprache englisch;
Abstract The sorption potential for SO42- 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 SO42- in humus layer samples and to determine site-dependent sorption parameters. SO42- sorption in humus layers is a concentration-dependent process. The linearity of isotherms reveals that SO42- is reversibly bound in the organic surface layer, as long as soil solution concentrations remain above 26 to 44 mg SO42- L-1. Natural isotope variations of sulfur in SO42- were analysed to investigate the degree of sorption of dissolved atmospheric and added SO42-. Both sulfate species differed significantly in their isotope composition. The pattern of delta(34)S values for SO42- in all equilibrium solutions confirm the findings from sorption isotherms, showing a close relationship between the sulfur isotope ratios of SO42- in soil solutions and the amount of SO42- sorbed at the humus layer matrix. Stored atmospheric SO42- in humus layers is released at sites where sulfate concentration in throughfall drops below 26 mg SO42- 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 SO42- sorption in humus layers.
ID 3788
dauerhafte UFZ-Verlinkung https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=3788
Schulz, H., Neue, H.-U. (2005):
Isotope studies to the sorption behavior of atmospheric sulfate in humus layers of Scots pine ecosystems
Isot. Environ. Health Stud. 41 (1), 39 - 47