Seasonal variations in pore water and sediment geochemistry of littoral lake sediments (Asylum Lake, MI, USA)

Koretsky, Carla M.; Haas, Johnson R.; Miller, Douglas; Ndenga, Noah T.

doi:10.1186/1467-4866-7-11

Cited by 46 publications

(32 citation statements)

References 86 publications

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“…However, it is much more likely that iron monosulfide phases including greigite, mackinawite or amorphous FeS (not included in the JCHESS thermodynamic database) will occur, rather than pyrrhotite, which is not often found in soil or sediments (Schoonen 2004). Pyrite (FeS 2 ) is significantly supersaturated at all depths, as has been reported for many other anoxic systems (Wersin et al 1991;Schoonen 2004;Koretsky et al 2006b;CM Koretsky et al submitted).…”

Section: Ironmentioning

confidence: 77%

“…Koretsky et al 2003Koretsky et al , 2005CM Koretsky et al submitted), lake sediments (e.g. Koretsky et al 2006b) and minerotrophic fens (e.g., Koretsky et al 2006a). The oxic zone is defined by the presence of dissolved oxygen and is generally very thin in organic-rich sediments or soils.…”

Section: Redox Stratificationmentioning

confidence: 98%

“…Because these methods are operational in nature, it can be difficult to compare results from different extraction schemes (Quevauviller 1998;Filgueiras et al 2002;Koretsky et al 2006b). Furthermore, artifacts like redistribution of elements between phases can be introduced during soil or sediment preservation (Filgueiras et al 2002).…”

Section: Solid Phase Metal Distributionsmentioning

confidence: 99%

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Spatial variation of redox and trace metal geochemistry in a minerotrophic fen

et al. 2007

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Pore water and solid phase samples were collected from the upper 50 cm of a peat profile at four sites within a 10 m 2 area in Kleinstuck Marsh, a minerotropic fen located in Kalamazoo, MI. Although the chosen sites are in close proximity to each other, they differ with respect to vegetation species and density. Pore water analyses for a suite of redox sensitive species (pH, alkalinity, dissolved Mn(II), Fe(II), Fe(III), sulfide, sulfate), together with Fe and Mn distributions inferred from operationallydefined sequential extractions, demonstrate that Fe(III) and Mn(IV) reduction occurs in the shallow peat at three of the four sites. At the fourth site, the only site containing the invasive purple loosestrife (Lythrum salicaria), accumulation of dissolved sulfide in the pore waters and increased levels of oxidizable phases in the shallow peat point to increased net sulfate reduction relative to the other three sites. Speciation calculations indicate that pore water concentrations of phosphate, especially below *10 cm depth, are largely controlled by the solubility of phases such as strengite or hydroxylapatite, and that at all but the loosestrife site, dissolved Ca and Mg are likely determined by carbonate solubility.Fe and Mn distribution among operationally defined solid phase fractions are consistent with reductive dissolution of FMO in the uppermost peat, leading to precipitation of Fe sulfides and Mn carbonates deeper in the peat profile. Zn, Co, Cr and Ni distributions are consistent with release from FMO to form sulfides or organic associations deeper in the peat. Pb and Cu may also be released by reductive dissolution of FMO, or more likely, shift from primary association with organic matter to increased association with sulfides under more sulfidic conditions. This study highlights the existence of extreme lateral variations in peat pore water and solid phase geochemical profiles, even over quite small areas.

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Section: Ironmentioning

confidence: 77%

Section: Redox Stratificationmentioning

confidence: 98%

Section: Solid Phase Metal Distributionsmentioning

confidence: 99%

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Spatial variation of redox and trace metal geochemistry in a minerotrophic fen

et al. 2007

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“…Some sediment components (Fe-Mn oxides) then become soluble, whereas the solubility of sulphides decreases. Variation in sediment quality is not only restricted to the top layers, as the diffusion of elements may proceed down to a depth of 50 cm in the sediment, due to its high water content (Griethuysen et al 2005;Koretsky et al 2006;Leonard et al 1993).…”

Section: Introductionmentioning

confidence: 99%

Characteristics and Seasonal Variation of Sediments in Lake Junttiselkä, Pyhäsalmi, Finland

Mäkinen

Lerssi

2007

Mine Water Environ

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Lake Junttiselkä, located in central Finland, has been loaded by effluents from Pyhäsalmi Zn-Cu mine since 1962 and also receives Pyhäsalmi municipal effluent. A total of 32 top sediment samples (0-2, 2-4, and 4-6 cm) were collected in October 2005 and March 2006 to examine the seasonal variation in sediment composition. Furthermore, two sediment cores of 1 m were taken from the northern and southern parts of the lake (Junttiselkä_N, Junttiselkä_S) to investigate the sedimentation history. Electrical conductivity (EC) was measured from the sediment in situ, and sediment pH, redox values, and EC were measured in the winter from the top samples. The sediment samples were freeze-dried and multi-element determinations were performed using ICP-MS on nitric acid extracts (EPA 3051, acid soluble fraction, AF) and on ammonium acetate extracts (bioavailable fraction, BF). The composition of crystalline and semi-crystalline fractions (CF) was calculated by the formula C CF = C AF -C BF . Due to the high clay content of till in the catchment area, the Al, K, and Mg concentrations in the natural lake sediments ([49 cm) are greater than the average level in lake sediments of Finland (AF). Soil cultivation has increased the sedimentation of fines, which has further increased Al, K, and Mg concentrations in the lake sediments (49-19 cm). Mine effluents have had the greatest impact on sediment concentrations of Cu and Zn, with the recorded levels of 166 mg/kg and 434 mg/kg (\19 cm), respectively, being nine-and threefold greater than the natural concentration level. Also, Ca and S concentrations are elevated. The electric conductivity of pore water was elevated at a depth of 1 m. Seasonal variation in the composition of Junttiselkä top sediments is linked to the oxic/anoxic conditions in the water column during the autumn to winter period. The greatest variation was recorded in the 0-2 cm layer in Junttiselkä_S, where Ca BF and S BF concentrations were three and sixfold higher in the winter than in the autumn. decreased. The seasonal variation in composition was less for CF than for BF, and was also partially different. The most significant difference was an increase in Ca CF and S CF concentrations in the winter in Junttiselkä_S, with the reverse situation being observed in Junttiselkä_N. Furthermore, the Fe CF concentration increased in Junttiselkä_N. Equimolar variations in Ca and S suggest that the precipitation and dissolution of gypsum is the most notable seasonal process in the top sediment layer. The seasonally precipitated S corresponds to only 1.4% of the total load of S from the mine effluents.

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“…Dissolved phosphate is produced at depth in the sediment of the three lakes (Fig. 7) as a by-product of OM mineralization being most likely released during reductive dissolution (Koretsky et al, 2006) of Fe-oxyhydroxides, for which it has a strong affinity (Dzombak and Morel, 1990). …”

Section: Early Diagenesis Processes and Organic Matter Mineralizationmentioning

confidence: 99%

Organic matter mineralization and trace element post-depositional redistribution in Western Siberia thermokarst lake sediments

et al. 2011

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Abstract. This study reports the very first results on highresolution sampling of sediments and their porewaters from three thermokarst (thaw) lakes representing different stages of ecosystem development located within the Nadym-Pur interfluve of the Western Siberia plain. Up to present time, the lake sediments of this and other permafrost-affected regions remain unexplored regarding their biogeochemical behavior. The aim of this study was to (i) document the early diagenesic processes in order to assess their impact on the organic carbon stored in the underlying permafrost, and (ii) characterize the post-depositional redistribution of trace elements and their impact on the water column. The estimated organic carbon (OC) stock in thermokarst lake sediments of 14 ± 2 kg m −2 is low compared to that reported for peat soils from the same region and denotes intense organic matter (OM) mineralization. Mineralization of OM in the thermokarst lake sediments proceeds under anoxic conditions in all the three lakes. In the course of the lake development, a shift in mineralization pathways from nitrate and sulfate to Fe-and Mn-oxyhydroxides as the main terminal electron acceptors in the early diagenetic reactions was suggested. This shift was likely promoted by the diagenetic consumption of nitrate and sulfate and their gradual depletion in the water column due to progressively decreasing frozen peat lixiviation occurring at the lake's borders. Trace elements were mobilized from host phases (OM and Fe-and Mn-oxyhydroxides) and partly sequestered in the sediment in the form of authigenic Fe-sulfides. Arsenic and Sb cycling was also closely linked to that of OM and Fe-and Mnoxyhydroxides. Shallow diagenetic enrichment of particulate Sb was observed in the less mature stages. As a result of auCorrespondence to: S. Audry (stephane.audry@get.obs-mip.fr) thigenic sulfide precipitation, the sediments of the early stage of ecosystem development were a sink for water column Cu, Zn, Cd, Pb and Sb. In contrast, at all stages of ecosystem development, the sediments were a source of dissolved Co, Ni and As to the water column. However, the concentrations of these trace elements remained low in the bottom waters, indicating that sorption processes on Fe-bounding particles and/or large-size organo-mineral colloids could mitigate the impact of post-depositional redistribution of toxic elements on the water column.

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Seasonal variations in pore water and sediment geochemistry of littoral lake sediments (Asylum Lake, MI, USA)

Abstract: Background: Seasonal changes in pore water and sediment redox geochemistry have been observed in many near-surface sediments. Such changes have the potential to strongly influence trace metal distribution and thus create seasonal fluctuations in metal mobility and bioavailability.

Cited by 46 publications

References 86 publications

Spatial variation of redox and trace metal geochemistry in a minerotrophic fen

Spatial variation of redox and trace metal geochemistry in a minerotrophic fen

Characteristics and Seasonal Variation of Sediments in Lake Junttiselkä, Pyhäsalmi, Finland

Organic matter mineralization and trace element post-depositional redistribution in Western Siberia thermokarst lake sediments

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