Phase Fractionation of Chemical Elements During the Formation of Ice in Fresh Surface Waters

Савенко, А. В.; Савенко, В. С.; Pokrovsky, Oleg S.

doi:10.1134/s1028334x20050207

Cited by 4 publications

(4 citation statements)

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“…Unlike eld observations that incorporate multiple parameters capable of impacting transformation of solutes over the soil column, laboratory experiments allow for more rigorous assessment of governing factors and quanti cation of freezing/thawing effects (Schwamborn et al, 2012;Chen et al, 2016;Spencer et al, 2017;Jiang et al, 2018;Kim and Choi, 2018;Chung et al, 2020;Savenko et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Fractionation of organic C, nutrients, metals and bacteria in peat porewater and ice after freezing and thawing

Morgalev

Lim

Morgaleva

et al. 2022

Environ Sci Pollut Res

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To better understand freezing -thawing cycles operating in peat soils of permafrost landscapes, we experimentally modelled bi-directional freezing and thawing of the three sections of 90-cm long peat core collected from a discontinuous permafrost zone in western Siberia. We measured translocation of microorganisms and changes in porewater chemistry (pH, UV absorbance, dissolved organic carbon (DOC), and major and trace element concentrations) after thawing and two-way freezing of peat cores. We demonstrate that bi-directional freezing and thawing of a peat core is capable of strongly modifying the vertical pattern of bacteria, DOC, nutrients, and trace element concentrations. Sizeable enrichment (a factor of 2 to 5) of DOC, macro-(P, K, Ca) and micro-nutrients (Ni, Mn, Co, Rb, B) and some low-mobile trace elements in several horizons of ice and peat porewater after freeze/thaw experiment may stem from physical disintegration of peat particles, leaching of peat constituents and opening of isolated (nonconnected) pores during freezing front migration. However, due to the appearance of multiple maxima of element concentration after a freeze-thaw event, the use of peat ice chemical composition as environmental archive for paleo-reconstructions is unwarranted.

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Section: Introductionmentioning

confidence: 99%

Fractionation of organic C, nutrients, metals and bacteria in peat porewater and ice after freezing and thawing

Morgalev

Lim

Morgaleva

et al. 2022

Environ Sci Pollut Res

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“…Since the 1970s, a lot of attention is given to the impact of freezing and thawing on soil properties (DeLuca et al, 1992;Kim et al, 2017;Larsen et al, 2002;Ren and Vanapalli, 2020;Schimel and Clein, 1996;Xiao et al, 2019). In contrast, studies on the influence of freezing and thawing on dissolved solutes of continental waters are only at their beginning (Chen et al, 2016;Hentschel et al, 2008;Pokrovsky et al, 2018;Savenko et al, 2020;Spencer et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

“…Most of them focused on surface water with near circum-neutral pH such as rivers (Chen et al, 2016;Savenko et al, 2020) and ponds (Pokrovsky et al, 2018). The main impact noticed by those studies is the decrease of aromaticity in waters due to FTC (Chen et al, 2016) and the generation of low molecular weight (LMW) organic components (Pokrovsky et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Impact of freeze-thaw cycles on organic carbon and metals in waters of permafrost peatlands

et al. 2021

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“…Although laboratory experiments allow for the identification of governing factors during freezing/thawing effects [36][37][38][39][40][41][42][43], their applications to naturally relevant aquatic settings of high latitude permafrost peatlands remain very restricted. Previous works in permafrost peatlands reported translocation of microorganisms and changes in porewater chemistry (pH, UV absorbance, DOC, major and trace element concentrations) after the thawing and bidirectional freezing of peat cores [44,45].…”

Section: Introductionmentioning

confidence: 99%

Partitioning of Dissolved Organic Carbon, Major Elements, and Trace Metals during Laboratory Freezing of Organic Leachates from Permafrost Peatlands

et al. 2023

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Climate change is likely to modify the freezing–thawing cycles in soils and surface waters of permafrost-affected and subarctic regions. However, the change of solution chemical composition during ice formation and the evolution of the remaining fluids remain very poorly known. Towards a better understanding of dissolved (<0.45 µm) organic carbon, as well as major and trace element behavior in permafrost peatland environments, here we performed laboratory freezing of peat leachates, from complete freezing to complete thawing, in order to quantify the partitioning of solutes between the aqueous solution and the remaining ice. Freezing experiments were conducted, with and without polyurethane insulation. Two main types of experiments involved (i) progressive freezing, when we started from liquid leachates (filtered <0.45 µm) and allowed them to freeze at −18 °C, and (ii) progressive thawing, where first, we froze solid a series of <0.45 µm filtered leachates and then monitored their thawing at room temperature, 20 °C. We hypothesized the existence of two main groups of solutes, behaving conservatively or non-conservatively during freezing, depending on their incorporation into the ice or their ability to coagulate in the form of insoluble minerals or amorphous materials in the fluid phase. An unexpected result of this work was that, despite a sizable degree of element concentration in the remaining fluid and possible coagulation of organic, organo-mineral, and inorganic compounds, the freezing and subsequent thawing produced final concentrations of most solutes which were not drastically different from the initial concentrations in the original leachates prior to freezing. This demonstrates the high stability of dissolved (<0.45 µm) organic carbon, iron, aluminum, and some trace metals to the repetitive freezing and thawing of surface waters in permafrost peatlands.

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Phase Fractionation of Chemical Elements During the Formation of Ice in Fresh Surface Waters

Cited by 4 publications

References 1 publication

Fractionation of organic C, nutrients, metals and bacteria in peat porewater and ice after freezing and thawing

Fractionation of organic C, nutrients, metals and bacteria in peat porewater and ice after freezing and thawing

Impact of freeze-thaw cycles on organic carbon and metals in waters of permafrost peatlands

Partitioning of Dissolved Organic Carbon, Major Elements, and Trace Metals during Laboratory Freezing of Organic Leachates from Permafrost Peatlands

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