1. Reduced sulfur and iron species in anoxic water column of meromictic crater Lake Pavin (Massif Central, France)
- Author
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Elvira Bura-Nakić, Irena Ciglenečki, Eric Viollier, Didier Jézéquel, Alassane Thiam, Center for Marine and Environmental Research, Rudjer BoškovićInstitute, Bijenička 54, 10 000 Zagreb, Croatia, Institut de Physique du Globe de Paris (IPGP), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Statistique de l'ENS (LPS), Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Rudjer Boskovic Inst, Dept Marine & Environm Res, Ctr Marine & Environm Res, Zagreb 10000, Croatia, Ministry of Science and Technology of the Republic of Croatia 098-0982934-2717French National Research Agency (ANR), Institut national des sciences de l'Univers (INSU - CNRS)-IPG PARIS-Université Paris Diderot - Paris 7 (UPD7)-Université de La Réunion (UR)-Centre National de la Recherche Scientifique (CNRS), Université Paris Diderot - Paris 7 (UPD7)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
Sulfide ,Iron ,Inorganic chemistry ,[SDU.STU]Sciences of the Universe [physics]/Earth Sciences ,chemistry.chemical_element ,010501 environmental sciences ,010502 geochemistry & geophysics ,01 natural sciences ,Metal ,chemistry.chemical_compound ,Water column ,Geochemistry and Petrology ,Crater lake ,Voltammetry ,0105 earth and related environmental sciences ,chemistry.chemical_classification ,Methylene blue ,Geology ,Sulfur ,Anoxic waters ,6. Clean water ,chemistry ,Spectrophotometry ,[SDU]Sciences of the Universe [physics] ,visual_art ,Environmental chemistry ,visual_art.visual_art_medium ,Nanoparticles - Abstract
International audience; The vertical distribution of reduced sulfur species (RSS including H2S/HS-, S-0, electroactive FeS) and dissolved Fe(II) was studied in the anoxic water column of meromictic Lake Pavin. Sulfide concentrations were determined by two different analytical techniques, i.e. spectophotometry (methylene blue technique) and voltammetry (HMDE electrode). Total sulfide concentrations determined with methylene blue method (Sigma H2SMBRS) were in the range from 0.6 mu M to 16.7 mu M and were substantially higher than total reduced sulfur species (RSSV) concentrations determined by voltammetry, which ranged from 0.1 to 5.6 mu M. The observed difference in the sulfide concentrations between the two methods can be assigned to the presence of FeS colloidal species.Dissolved Fe was high (>1000 mu M), whereas dissolved Mn was only 25 mu M, in the anoxic water column. This indicates that Fe is the dominant metal involved in sulfur redox cycling and precipitation. Consequently, in the anoxic deep layer of Lake Pavin, "free" sulfide, H2S/HS-, was low; and about 80% of total sulfide detected was in the electroactive FeS colloidal form. IAP calculations showed that the Lake Pavin water column is saturated with respect to FeSam phase. The upper part of monimolimnion layer is characterized by higher concentrations of S (0) (up to 3.4 mu M) in comparison to the bottom of the lake. This behavior is probably influenced by sulfide oxidation with Fe(III) oxyhydroxide species
- Published
- 2009
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