Dissolved organic matter degradation by sunlight coagulates organo-mineral colloids and produces low-molecular weight fraction of metals in boreal humic waters

Oleinikova, Olga; Drozdova, O. Yu.; Lapitskiy, S. A.; Демин, В. В.; Bychkov, A. Yu.; Pokrovsky, Oleg S.

doi:10.1016/j.gca.2017.05.023

Cited by 36 publications

(35 citation statements)

References 120 publications

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“…was consistent with lack of autochthonous DOM in all studied water objects, which were dominated by terrestrial (aromatic) DOM from peat horizons. Overall, our observations confirm the conclusion achieved from a recent compilation of available data across the world that degradation processes act preferentially on CDOM rather than DOC concentration (Massicotte et al, 2017;Oleinikova et al, 2017).…”

Section: Negligible Impact Of Photodegradation On Dom Transformation supporting

confidence: 91%

“…The dominance of photolytic processes in DOM processing in arctic waters was reported for N America (Cory et al, 2014;Ward et al, 2017), Canadian surface waters of the temperate zone (Winter et al, 2007;Porcal et al, 2013Porcal et al, , 2014Porcal et al, , 2015, and small Swedish humic-rich headwater catchments (Köhler et al, 2002). In contrast, several other studies from Scandinavia (Groeneveld et al, 2016;Koehler et al, 2014), Canada (Laurion and Mladenov, 2013;Gareis and Lesack, 2018) and NW Russia (Oleinikova et al, 2017;Chupakova et al, 2018) demonstrated sizeable removal of colored Biogeosciences Discuss., https://doi.org/10.5194/bg-2018-528 Manuscript under review for journal Biogeosciences Discussion started: 14 January 2019 c Author(s) 2019. CC BY 4.0 License.…”

Section: Introductionmentioning

confidence: 70%

“…For this, the O2 galvanic sensor was introduced into the quartz tube immediately after opening of the reactor and allowed to equilibrate for 5-10 min while protecting the open end of the tube from the exchange with atmospheric oxygen via wrapping it in Al foil. All filtered sampled collected from photodegradation experiments were acidified with ultrapure nitric acid and analyzed for major and trace elements following procedures employed in GET (Toulouse) for analyses of boreal humic waters (Oleinikova et al, 2017(Oleinikova et al, , 2018.…”

Section: Analyses and Treatmentmentioning

confidence: 99%

“…Recently, no measurable photochemical loss of ancient permafrost DOC has been revealed in the thawing yedoma permafrost sites of the Kolyma River, its tributaries and streams (Stubbins et al, 2017). Another recent study of DOM photodegradation in boreal highlatitude peatland streams of the White Sea watershed demonstrated only 10% decrease in DOC concentration over 10 days of incubation under sunlight (Oleinikova et al, 2017). In the estuarine zone of the largest European Arctic river draining wetland-and forest-dominated permafrost-free territory (Severnaya Dvina), we did not found any measurable photodegradation of DOM over 1 month of exposure (Chupakova et al, 2018).…”

Section: Negligible Impact Of Photodegradation On Dom Transformation mentioning

confidence: 99%

“…In contrast to DOC, sizeable removal of dissolved P and Fe together with some related trace elements (Ti, V, Zn, Nb) during photolysis of surface waters reflects transformation and coagulation of Fe-rich colloids, that behave independent on organic colloids in humic waters (Vasyukova et al, 2010;Pokrovsky et al, 2016). This precipitation of Fe hydroxides together with P and insoluble trace elements was mostly pronounced in permafrost stream which had the highest pH and thus allowed minimal stability of Fe(III) hydroxides that were coagulated after removal of small amount of DOM that stabilized colloidal Fe (Oleinikova et al, 2017).…”

Section: Negligible Impact Of Photodegradation On Dom Transformation mentioning

confidence: 99%

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Humic surface waters of frozen peat bogs (permafrost zone) are highly resistant to bio- and photodegradation

Shirokova¹,

Chupakov²,

Zabelina³

et al. 2019

Preprint

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Abstract. Bio- and photo-degradation of dissolved organic matter (DOM) is identified as dominant vector of C cycle in boreal and high-latitude surface waters. In contrast to large number of studies of humic waters from permafrost-free regions and oligotrophic waters from permafrost-bearing regions, the bio- and photo-lability of DOM from humic surface waters of permafrost-bearing regions has not been thoroughly evaluated. Following standardized methods, we measured biodegradation (low, intermediate, high temperature) and photodegradation (one intermediate temperature) of DOM in surface waters along the hydrological continuum (depression &#8594; stream &#8594; thermokarst lake &#8594; river Pechora) within a European Russian frozen peatland. In all systems, there was no measurable (&#8805;&#8201;10&#8201;%) bio- or photodegradation of DOM over 1 month of incubation. It is possible that the main cause of the lack of degradation is the dominance of allochthonous refractory (soil, peat) DOM in all studied waters. Yet, all surface waters were supersaturated with CO2. Thus, this study suggest that, rather than bio- and photo-degradation of DOM in the water column, other factors such as peat porewater DOM processing and respiration of sediments are the main drivers of elevated pCO2 and emission in humic boreal waters of frozen peat bogs.

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Section: Negligible Impact Of Photodegradation On Dom Transformation supporting

confidence: 91%

Section: Introductionmentioning

confidence: 70%

Section: Analyses and Treatmentmentioning

confidence: 99%

Section: Negligible Impact Of Photodegradation On Dom Transformation mentioning

confidence: 99%

Section: Negligible Impact Of Photodegradation On Dom Transformation mentioning

confidence: 99%

See 3 more Smart Citations

Humic surface waters of frozen peat bogs (permafrost zone) are highly resistant to bio- and photodegradation

Shirokova¹,

Chupakov²,

Zabelina³

et al. 2019

Preprint

Self Cite

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Characterization and modification of the molecular weight distribution within dissolved organic matter using flow field‐flow fractionation

Pan

2020

Limnology & Ocean Methods

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Dissolved organic matter (DOM) exists ubiquitously in the aquatic environment with varying chemical compositions and a wide molecular weight (MW) distribution, which, as a result, exhibits differing impacts on the behavior and fate of contaminants. The current methods for the MW characterization of DOM usually possess some weaknesses and therefore, some novel techniques are needed. In this study, the feasibility and sensitivity of flow field-flow fractionation (FlFFF) system were studied for the MW characterization of DOMs from various origins. The systematic evaluation of FlFFF indicated that a mobile phase consisting of 10 mM NaCl and 5 mM H 3 BO 3 and with a pH of 8 was optimal, and the fractionation program with a cross-flow rate of 2 mL/min and a focusing time of 2 min resulted in the most efficient MW fractionation. Compared to natural waters, the standard DOM materials possessed a high proportion of humic-like substances and narrow MW distribution. The quantification analysis showed that chromophoric organic ligands were mainly distributed in the high (i.e., 100 kDa-0.45 μm) and low (i.e., 0.3-1 kDa) MW fractions for natural waters, but in the medium (i.e., 1-100 kDa) and low MW fractions for the standard DOM materials. However, the fluorescent humic-like substances were predominantly distributed within the medium and low MW fractions, irrespective of DOM types. This study showed the feasibility and sensibility of FlFFF in fractionating DOM samples, and can be used to quantify the different MW distribution of chromophoric and fluorescent components in standard and natural DOM.

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Ultrafiltration for the Determination of Cu Complexed with Dissolved Organic Matters of Different Molecular Weight from a Eutrophic River, China

Zhang

Zhou

et al. 2018

Bull Environ Contam Toxicol

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The molecular weight of dissolved organic matter (DOM) is one of the essential factors controlling the properties of metal complexes. A continuous ultrafiltration experiment was designed to study the properties of Cu complexes with different molecular weights in a river before and after eutrophication. The results showed that the concentration of DOM increased from 26.47 to 38.20 mg/L during the eutrophication process, however, DOM was still dominated by the small molecular weight fraction before and after eutrophication. The amount of Cu-DOM complexes increased with the increasing of molecular weight, however, the amounts of DOM-Cu complexes before eutrophication were higher than those after eutrophication. This is because DOM contained more -COOH and -OH before eutrophication and these functional groups are the active sites complexed with Cu.

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Dissolved organic matter degradation by sunlight coagulates organo-mineral colloids and produces low-molecular weight fraction of metals in boreal humic waters

Cited by 36 publications

References 120 publications

Humic surface waters of frozen peat bogs (permafrost zone) are highly resistant to bio- and photodegradation

Humic surface waters of frozen peat bogs (permafrost zone) are highly resistant to bio- and photodegradation

Characterization and modification of the molecular weight distribution within dissolved organic matter using flow field‐flow fractionation

Ultrafiltration for the Determination of Cu Complexed with Dissolved Organic Matters of Different Molecular Weight from a Eutrophic River, China

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