Naslov
Iron sulfide species in anoxic water column of meromictic Pavin crater lake (Central Massif, France)

Autori
Ciglenečki, Irena ; Bura-Nakić, Elvira ; Viollier, Eric ; Jézéquel, Didier

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, ostalo

Izvornik
ASLO Aquatic Sciences Meeting 2009 ; A Cruise Through Nice Waters / Gattuso, J.P. ; Bossard, P. ; Weinbauer, M. - Waco (TX), 2009, 51-51

Skup
ASLO Aquatic Sciences Meeting 2009 ; A Cruise Through Nice Waters

Mjesto i datum
Nica, Francuska, 25.01.2009. - 30.01.2009

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
sulfide ; iron ; nanoparticles ; voltammetry ; spectrophotometry ; methylene blue

Sažetak
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.

Izvorni jezik
Engleski

Znanstvena područja
Geologija

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