Trace elements in organic- and iron-rich surficial fluids of the boreal zone: Assessing colloidal forms via dialysis and ultrafiltration

Vasyukova, Ekaterina; Pokrovsky, Oleg S.; Viers, Jérôme; Oliva, Priscia; Dupré, Bernard; Martin, F.; Candaudap, Frédéric

doi:10.1016/j.gca.2009.10.026

Cited by 139 publications

(117 citation statements)

References 60 publications

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“…A stack diagram of element proportion in colloidal form is illustrated in Figure 2A. The affinity of chemical elements towards colloidal fraction is fairly well documented in many boreal rivers and streams (e.g., Ingri et al, 2000;Pokrovsky and Schott, 2002;Pokrovsky et al, 2006;Dahlqvist et al, 2007;Vasyukova et al, 2010), and is most likely linked to their presence in the form of Fe-rich, organic-matter stabilized aggregates of large (10 kDa -0.22 mm) molecular weight. This is further illustrated by ultrafiltration pattern of TE partitioning in colloids assessed from the experiments performed at the wetland surface water adjacent to the lake Vilno (Fig.…”

Section: Element Speciation In Colloidsmentioning

confidence: 98%

“…Unfortunately, due to contamination during dialysis procedure, we were not able to measure the proportion of colloidal fraction of Cu and Zn in studied lake. However, from the knowledge of these metals speciation in adjacent boreal zones, they are most likely to be present in small-size organic (fulvic) complexes and simple ions, respectively (Vasyukova et al, 2010). The trace elements are likely to be involved in two major processes controlling their concentration in the lake water: uptake by growing phytoplankton and release during degradation of allochtonous and autochtonous organic matter by heterotrophic bacterioplankton.…”

Section: Element Concentration Variation During the Diurnal Photosyntmentioning

confidence: 99%

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Diurnal variations of trace metals and heterotrophic bacterioplankton concentration in a small boreal lake of the White Sea basin

Shirokova

Pokrovsky

Viers

et al. 2010

Ann. Limnol. - Int. J. Lim.

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-This work represents a concerted effort aimed at understanding the microbiological and chemical evolution of a small boreal lake during the diurnal cycle of photosynthesis. We studied diurnal variation of y 40 dissolved macro-and trace elements, organic carbon and bacterial population dynamics in the surface and bottom water layer of the shallow Vilno Lake in the White Sea basin. Four-days continuous measurements with 6 h sampling steps both at the surface (0.5 m) and on the bottom (4.0 m depth) during no-bloom periods revealed constant concentrations (within ¡ 20-30%) of all major elements (Na, Mg, Si, K, Ca), organic and inorganic carbon and most trace elements (B, V, Cr, Fe, Cu, Ga, As, Rb, Sr, Y, Zr, Sb, Cs, Ba, all REEs, Hf, Pb, Th, U). At the same time, the concentration of some biologically important trace metals (Mo, Mn, Co, Cd) was subjected to variations partially reflecting the change of bacterioplankton concentration. This work enables two types of element behavior to be distinguished during photosynthesis in the water column -constant concentration and sinusoidal variations -depending on their speciation in solution and their affinity to aquatic microorganisms.

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Section: Element Speciation In Colloidsmentioning

confidence: 98%

Section: Element Concentration Variation During the Diurnal Photosyntmentioning

confidence: 99%

Diurnal variations of trace metals and heterotrophic bacterioplankton concentration in a small boreal lake of the White Sea basin

Shirokova

Pokrovsky

Viers

et al. 2010

Ann. Limnol. - Int. J. Lim.

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“…Anschutz et al, 2000;Kostka and Luther III, 1994). Alkalinity and DOC from the water column samples were analysed using methods routinely used in our laboratory for analysis of boreal organic-rich water samples Vasyukova et al, 2010). Briefly, Alkalinity was measured by potentiometric titration with HCl by automated titrator (Metrohm 716 DMS Titrino) using a Gran method with a detection limit of 10 −5 M and an uncertainty of 2 %.…”

Section: Analysesmentioning

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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“…35,41,47 A possível sorção de metais na membrana, a separação por cargas, a necessidade de múltiplas coletas para capturar variações temporais das espécies e a alta demanda de tempo e constituem alguns dos pontos negativos da UF. 34,47,48 Além disso, a necessidade de armazenamento de água implica em mudanças (oxidação e/ou agregação) nas espécies originalmente presentes. 34 Entretanto, tem-se desenvolvido métodos para ultrafiltração e estudos de especiação on site, o que minimiza esses problemas.…”

Section: Particuladaunclassified

“…34 Entretanto, tem-se desenvolvido métodos para ultrafiltração e estudos de especiação on site, o que minimiza esses problemas. 5,28,29,48 Procedimentos de filtração e UF também têm sido utilizados no estudo de complexação de metais e metaloides com a matéria orgânica, especialmente com SH, em alternativa a métodos de diálise, que são mais lentos, embora possuam vantagens como redução de fontes de contaminação (como tubos, filtros e recipiente de filtração) e minimização de entupimento da membrana pela filtração forçada. 5 Os resultados obtidos com SCP têm sido comparados com os resultados obtidos por GF-AAS e tem a vantagem de uma instrumentação mais simples, de baixo custo e a possibilidade de ser aplicada em análises on site.…”

Section: Particuladaunclassified

Metal and Metalloid Speciation in Aquatic Environments: Concepts, Techniques and Applications

Gontijo¹,

Monteiro²,

Rosa³

2017

Rev. Virtual Quim.

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Aquatic environments are dynamic systems, where metals and metalloids are continuously transformed and mobilised through different chemical forms among organic and inorganic substances and particulate material. These different forms of an element have different behaviours in a way that its total concentration provides just incomplete information related to mobility, bioavailability and toxicity. This work aimed to show the main features of the behaviour of metals and metalloids in aquatic environments and present the main techniques used in the investigation of chemical species and/or interactions with colloids and particulate material. Some of these techniques include filtration, ultrafiltration (UF), diffusive gradients in thin films (DGT), scanned deposition potential (SCP) and absence of gradients and nernstian equilibrium stripping (AGNES). Speciation and fractioning studies of water samples can indicate the potential bioavailability and mobility of metals and metalloids, especially when different techniques are used together.Keywords: Ultrafiltration; DGT; electrochemical techniques; trace metals; organic ligands. ResumoAmbientes aquáticos são sistemas dinâmicos, onde metais e metaloides transformam-se constantemente e são mobilizados em diferentes formas químicas na presença de substâncias orgânicas, inorgânicas e material particulado. Essas diferentes formas de um dado elemento possuem diversos comportamentos no ambiente, de modo que apenas a análise da sua concentração total fornece informações incompletas relativas a mobilidade, biodisponibilidade e toxicidade. Este trabalho teve como objetivos mostrar os principais aspectos do comportamento de metais e metaloides no meio aquático e apresentar algumas das principais técnicas utilizadas para estudo das suas espécies químicas e/ou interações com coloides e material particulado. Algumas dessas técnicas incluem filtração, ultrafiltração, difusão em filmes finos por gradientes de concentração (DGT), cronopotenciometria de redissolução anódica (SCP) e redissolução nernstiana na ausência de gradientes (AGNES). Estudos de especiação e fracionamento de amostras de água podem indicar a potencial biodisponibilidade e mobilidade de metais e metaloides, especialmente quando diferentes técnicas são aplicadas em conjunto.Palavras-chave: Ultrafiltração; DGT; técnicas eletroquímicas; metais-traço; ligantes orgânicos.

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Trace elements in organic- and iron-rich surficial fluids of the boreal zone: Assessing colloidal forms via dialysis and ultrafiltration

Cited by 139 publications

References 60 publications

Diurnal variations of trace metals and heterotrophic bacterioplankton concentration in a small boreal lake of the White Sea basin

Diurnal variations of trace metals and heterotrophic bacterioplankton concentration in a small boreal lake of the White Sea basin

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

Metal and Metalloid Speciation in Aquatic Environments: Concepts, Techniques and Applications

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