Abstract：
:The spatiotemporal changes of metals, inorganic ions and physiochemical parameters of Aitoliko lagoon, an anoxic wetland in Western Greece, were studied with special emphasis in sulfur species. Theoretical physicochemical modeling was performed for the sulfur speciation, based on experimental pH and redox potential data. Accordingly, the speciation of sulfur in the lagoon can be operationally divided in two domains: (a) for depths d = 0-10 m below the surface, the sulfur speciation can be described by equilibrium reactions between the aqueous species. (b) At depths d > 10 m a progressive decline for SO4(2-) concentration is observed between theory and experiment. At the lagoon-bottom an elevated concentration of 19+/-2 mM SO4(2-) was measured, which cannot be described by physicochemical equilibrium based on the pH, E(h), O2 concentrations measured in situ. Accordingly, we suggest that additional biogeochemical processes, such as sulfur bacteria activity, have to be invoked. Of particular importance is that the experimental pH-pe values cross the critical region where the interplay of SO4(2-)/S2(-)/H2S occurs. This explains why a relatively small fluctuation of pH, pe values may result in a shift of the equilibrium over one sulfur species. This explains the, otherwise accidental, previously reported releases of H2S in the air over the lagoon.
journal_name
Chemospherejournal_title
Chemosphereauthors
Papadas IT,Katerinopoulos L,Gianni A,Zacharias I,Deligiannakis Ydoi
10.1016/j.chemosphere.2008.11.009subject
Has Abstractpub_date
2009-02-01 00:00:00pages
1011-7issue
8eissn
0045-6535issn
1879-1298pii
S0045-6535(08)01410-0journal_volume
74pub_type
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