English
 
User Manual Privacy Policy Disclaimer Contact us
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT

Released

Journal Article

Dynamics of zero-valent sulfur species, including polysulfides, in Wadden Sea tidal flat pools

MPS-Authors
/persons/resource/persons210497

Kamyshny,  A.
Department of Biogeochemistry, Max Planck Institute for Marine Microbiology, Max Planck Society;

/persons/resource/persons210363

Ferdelman,  T. G.
Department of Biogeochemistry, Max Planck Institute for Marine Microbiology, Max Planck Society;

External Ressource
No external resources are shared
Fulltext (public)
There are no public fulltexts stored in PuRe
Supplementary Material (public)
There is no public supplementary material available
Citation

Kamyshny, A., & Ferdelman, T. G. (2007). Dynamics of zero-valent sulfur species, including polysulfides, in Wadden Sea tidal flat pools. Geochimica et Cosmochimica Acta, 71(15 Suppl. Suppl. S), A461-A461.


Cite as: http://hdl.handle.net/21.11116/0000-0001-CE1E-7
Abstract
Zero-valent sulfur species dynamics in tidal flat pools of Wadden Sea (North Sea) were studied. Concentrations of solid sulfur, colloidal sulfur of different particle sizes and distribution of inorganic polysulfide species were detected near the bottom of different pools as a function of time after detachment of the pool from sea. Concentrations of these species were detected also in the incubated sediment cores taken from the same site with the pumping of anoxic seawater, anoxic seawater spiked with sulfide and anoxic seawater spiked with lactate. Sulfide concentration in the pool increased during the first 2 h of pool detachment from the sea to a maximum of 273 µM. Polysulfides were present at the beginning of the detachment of the pool and higher concentrations of elemental sulfur and polysulfides lead to more rapid coagulation and precipitation of dispersed solid sulfur. The process of the formation of zero-valent sulfur began with the formation of polysulfides and colloidal sulfur with a particle size less than 5 μm. Further coagulation led to an increase in the amount of colloidal sulfur with the particle size more than 5 μm followed by crystallization of solid sulfur particles. Maximum concentration of colloidal sulfur detected in the pools was 73 µM and that of solid sulfur was 25 µM. Maximum concentration of the sum of all polysulfide species measured was 5.9 µM, which corresponded to 23.1 µM of detected polysulfide sulfur or to 27.7 µM of polysulfide sulfur taking into account the calculated concentrations of species with concentration under detection limit. Polythionates were not detected. Levels of total zero-valent sulfur usually reached the value of 40 µM, but can be even higher than 100 µM. This depended on the overall concentration of sulfide. In the tidal pools, polysulfide chain lengths were short and the polysulfide system was found not to be in equilibrium with solid or colloidal sulfur at any time of pool detachment from sea. Flow-through incubation experiments, however, exhibited polysulfide in equilibrium with respect to rhombic sulfur. No difference in the polysulfide speciation was observed in experiments where sulfide was artificially added and sulfide was produced through enhanced bacterial sulfate reduction. The differences were attributed to the kinetics and to competing oxidation processes present in the exposed Wadden Sea tidal pools as compared to the longer running and more restricted incubation experiments.