Stable sulfur isotopes in forest spring waters from the Fichtelgebirge (Germany)

Durka, W.; Giesemann, A.; Schulze, E.-D.; Jäger, H. J.

doi:10.1080/10256019908234096

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Stable sulfur isotopes in forest spring waters from the Fichtelgebirge (Germany)

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Durka, W., Giesemann, A., Schulze, E.-D., & Jäger, H. J. (1999). Stable sulfur isotopes in forest spring waters from the Fichtelgebirge (Germany). Isotopes in Environmental and Health Studies, 35(3), 237-249. doi:10.1080/10256019908234096.

Cite as: https://hdl.handle.net/11858/00-001M-0000-000E-E186-7

Abstract

The potential role of processes discriminating S isotopes, for example dissimilatory SO42- reduction and mineralization, in determining SO42- concentrations was studied in forest spring water. S-isotope composition of sulfate from atmospheric input and forest springs representing a wide range of SO42- concentrations was investigated in the Fichtelgebirge (NE Bavaria, Germany). delta(34)S values in atmospheric input ranged from +3.7 to + 5.7 parts per thousand. In spring waters with SO42- > 150 mu mol l(-1) delta(34)S values were between +4 and +5 parts per thousand, whereas delta(34)S values increased up to +7.2 parts per thousand below 150 mu mol l(-1) SO42-. SO42- mineralization seemed to have no effect on isotopic composition since all delta(34)S values of spring water were higher than input values. Dissimilatory SO42- reduction occurred in springs with SO42- < 150 mu mol l(-1). Spatial heterogeneity in forest soils or flow paths has to be invoked to explain increased delta(34)S values since NO₃- concentrations would not allow for SO42- reduction to occur. [References: 26]