Reduced sulfur and iron species in anoxic water column of meromictic crater Lake Pavin (Massif Central, France)

Bura-Nakić, Elvira; Viollier, Éric; Jézéquel, Didier; Thiam, Alassane; Ciglenečki, Irena

doi:10.1016/j.chemgeo.2009.06.020

Cited by 62 publications

(72 citation statements)

References 47 publications

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“…Although not measured in May 2014, previous campaign measurements indicated that the minimum in the redox potential occurred close to this depth (e.g., 60 m in September 2014 and 60.7 m in May 2015). This is consistent with previous reports of the variations in concentrations of S compounds in the water column of this lake [33,34,49]. At this depth, several bacteria with intracellular inclusions measuring 500 nm-1 µm in diameter exclusively composed of S were observed in September 2014 (Figure 9c,d,f).…”

Section: Microorganisms: Mineral Interactions Down To the Deep Monimosupporting

confidence: 82%

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Mineralogical Diversity in Lake Pavin: Connections with Water Column Chemistry and Biomineralization Processes

et al. 2016

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Abstract:As biominerals are good tracers of microbial interactions with the environment, they may provide signatures of microbial evolution and paleoenvironmental conditions. Since modern analogues of past environments help with defining proxies and biosignatures, we explored microbe mineral interactions in the water column of a maar lake, located in France: Lake Pavin. This lake is considered as a potential Precambrian ocean analogue, as it is ferruginous and meromictic, i.e., stratified with a superficial O 2 -rich layer (mixolimnion) and a deeper permanently anoxic layer (monimolimnion). We combined bulk chemical analyses of dissolved and particulate matter in combination with electron microscopy analyses of the particulate matter at different depths along the water column. The mineralogy changed along with water chemistry, and most of the minerals were intimately associated with microorganisms. Evolution of the redox conditions with depth leads to the successive precipitation of silica and carbonates, Mn-bearing, Fe-bearing and S-containing phases, with a predominance of phosphates in the monimolimnion. This scheme parallels the currently-assessed changes of microbial diversity with depth. The present results corroborate previous studies that suggested a strong influence of microbial activity on mineralogical diversity through extracellular and intracellular biomineralization. This paper reports detailed data on mineralogical profiles of the water column and encourages extended investigation of these processes.

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Section: Microorganisms: Mineral Interactions Down To the Deep Monimosupporting

confidence: 82%

“…(4) Finally, multiple sulfur-cycling microorganisms are present in these lakes [17,32]. Chemical and Fe isotope analyses of sedimentary pyrite (FeS 2 ) suggest that these microbes may contribute to Fe sulfide precipitation in the water column [5,33,34].…”

Section: Introductionmentioning

confidence: 99%

Mineralogical Diversity in Lake Pavin: Connections with Water Column Chemistry and Biomineralization Processes

et al. 2016

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“…Some of these materials may have been FeS nanoparticles. More recent work in our own laboratory [44] has demonstrated that as much as half the S(-II) determined by the methylene blue method in Lake Pavin (central France) consists of filter-passing (< 0.2 mm) FeS particles. An Hg electrode that is inserted into a sample of sulfidic lake water is likely to become partially covered with FeS.…”

Section: Analytical Implications For Natural Watersmentioning

confidence: 99%

Characterization of Iron Sulfide Species in Model Solutions by Cyclic Voltammetry. Revisiting an Old Problem

Bura-Nakić¹,

Krznarić²,

Helz³

et al. 2011

Electroanalysis

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A long-standing problem associated with voltammetric determination of iron and sulfide in reduced natural waters has been the nature of the presumed analyte responsible for a reduction peak at À1.1 V vs. Ag/AgCl. Cyclic voltammetry at the Hg electrode is used here to study solutions with different Fe(II) to sulfide ratios in chloride and acetate electrolytes (pH 6-7). The results indicate that the À1.1 V peak can be assigned to reduction of Fe 2 + or its labile complexes on FeS layers that partially cover the Hg electrode. Hg electrodes covered with FeS act like FeS solid electrodes over a very wide potential range (À0.35 to À1.9 V). Two mechanisms for forming FeS layers on Hg are described. Over the broadest deposition potential range, the dominant mechanism involves attachment at the Hg surface of FeS nanoparticles, which are generated quickly in initially supersaturated mixtures of Fe(II) and S(-II). In a narrow deposition potential range, roughly À0.56 to À0.70, FeS layers are produced additionally by replacement of preformed HgS. Because Fe 2 + is reduced at À1.1 V on FeS layers and at À1.4 V on bare Hg, it may be underdetermined when only the À1.4 V peak is measured.

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“…Usually, well-separated voltammetric peaks are observed for the anodic deposition of HgS, but only one peak is observed for the cathodic dissolution of HgS [1][2][3][4]. The reduction of HgS layers is often used for the quantitative determination of sulfur species in natural waters [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Zinc sulfide surface formation on Hg electrode during cyclic voltammetric scan: an implication for previous and future research studies on metal sulfide systems

Ciglenečki

Bura-Nakić

Marguš

2011

J Solid State Electrochem

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Cyclic voltammetry on the Hg electrode was used to investigate the electrochemical behavior of NaCl/NaHCO 3 electrolyte solutions supersaturated with respect to Zn sulfide phases. The voltammetric results clearly show how an Hg electrode, due to exchange between Hg 2+ from an HgS adlayer and Zn 2+ from solution, becomes the site for surface ZnS adlayer formation in the potential range −0.45 to −0.6 V. The exchange reaction is reversible, and the surface-formed ZnS adlayer persists at the Hg electrode surface until −1.3 V during cathodic scans. Near −1.3 V, it is reduced. In the same solution, evidence for reduction of bulk Zn sulfide species including nanoparticles was not obtained. The approach emphasized here can be readily extended to any other system consisting of metal electrode and chalcogenide anions, pointing to the importance of choosing experimental conditions (i.e., deposition potential, stirring, and accumulation times) to avoid artifacts and wrong interpretation of data due to surface formation of metal sulfide species.

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Reduced sulfur and iron species in anoxic water column of meromictic crater Lake Pavin (Massif Central, France)

Cited by 62 publications

References 47 publications

Mineralogical Diversity in Lake Pavin: Connections with Water Column Chemistry and Biomineralization Processes

Mineralogical Diversity in Lake Pavin: Connections with Water Column Chemistry and Biomineralization Processes

Characterization of Iron Sulfide Species in Model Solutions by Cyclic Voltammetry. Revisiting an Old Problem

Zinc sulfide surface formation on Hg electrode during cyclic voltammetric scan: an implication for previous and future research studies on metal sulfide systems

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