Iron sulfide species in anoxic water column of meromictic Pavin crater lake (Central Massif, France) (CROSBI ID 547714)
Prilog sa skupa u zborniku | sažetak izlaganja sa skupa | međunarodna recenzija
Podaci o odgovornosti
Ciglenečki, Irena ; Bura-Nakić, Elvira ; Viollier, Eric ; Jézéquel, Didier
engleski
Iron sulfide species in anoxic water column of meromictic Pavin crater lake (Central Massif, France)
Sulfur electrochemical speciation techniques were applied to understand the chemistry and cycling of sulfur in a meromictic crater lake, Pavin Lake (France). Using a cathodic stripping cyclic and linear sweep voltammetry technique we aimed to make distinguish between “ free” and iron sulfide species in the anoxic deep layers. High determined concentrations (>1000 µ ; M) of dissolved Fe (<0.2 µ ; M) in anoxic water column indicate that Fe is dominant metal involved in sulfur redox cycling and precipitation. Consequently, in anoxic deep layer of Lake Pavin Lake “ free” H2Saq was low ; , and about 80 % of total sulfide detected (<0.2 μ m) was in the FeSaq and/or FeSam colloidal form. IAP calculations showed that Pavin Lake water column is saturated with respect to the FeSam phases. Sulfide concentrations were determined parallel by using spectophotometry methylene blue technique. ∑ H2S concentrations determined on that way (0.6 µ ; M to 16.7 µ ; M) were substantial higher than H2Saq concentrations determined by voltammetric measurements (0.1 to 3.7 μ M). Observed difference in the RSS concentrations between the two methods can be assigned to the presence of FeS dissolved and/or colloidal species.
sulfide ; iron ; nanoparticles ; voltammetry ; spectrophotometry ; methylene blue
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Podaci o prilogu
51-51.
2009.
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objavljeno
Podaci o matičnoj publikaciji
ASLO Aquatic Sciences Meeting 2009 ; A Cruise Through Nice Waters
Gattuso, J.P. ; Bossard, P. ; Weinbauer, M.
Waco (TX):
Podaci o skupu
ASLO Aquatic Sciences Meeting 2009: A Cruise Through Nice Waters
predavanje
25.01.2009-30.01.2009
Nica, Francuska