1
|
Grevesse T, Guéguen C, Onana VE, Walsh DA. Degradation pathways for organic matter of terrestrial origin are widespread and expressed in Arctic Ocean microbiomes. MICROBIOME 2022; 10:237. [PMID: 36566218 PMCID: PMC9789639 DOI: 10.1186/s40168-022-01417-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/15/2022] [Accepted: 11/08/2022] [Indexed: 06/17/2023]
Abstract
BACKGROUND The Arctic Ocean receives massive freshwater input and a correspondingly large amount of humic-rich organic matter of terrestrial origin. Global warming, permafrost melt, and a changing hydrological cycle will contribute to an intensification of terrestrial organic matter release to the Arctic Ocean. Although considered recalcitrant to degradation due to complex aromatic structures, humic substances can serve as substrate for microbial growth in terrestrial environments. However, the capacity of marine microbiomes to process aromatic-rich humic substances, and how this processing may contribute to carbon and nutrient cycling in a changing Arctic Ocean, is relatively unexplored. Here, we used a combination of metagenomics and metatranscriptomics to assess the prevalence and diversity of metabolic pathways and bacterial taxa involved in aromatic compound degradation in the salinity-stratified summer waters of the Canada Basin in the western Arctic Ocean. RESULTS Community-scale meta-omics profiling revealed that 22 complete pathways for processing aromatic compounds were present and expressed in the Canada Basin, including those for aromatic ring fission and upstream funneling pathways to access diverse aromatic compounds of terrestrial origin. A phylogenetically diverse set of functional marker genes and transcripts were associated with fluorescent dissolved organic matter, a component of which is of terrestrial origin. Pathways were common throughout global ocean microbiomes but were more abundant in the Canada Basin. Genome-resolved analyses identified 12 clades of Alphaproteobacteria, including Rhodospirillales, as central contributors to aromatic compound processing. These genomes were mostly restricted in their biogeographical distribution to the Arctic Ocean and were enriched in aromatic compound processing genes compared to their closest relatives from other oceans. CONCLUSION Overall, the detection of a phylogenetically diverse set of genes and transcripts implicated in aromatic compound processing supports the view that Arctic Ocean microbiomes have the capacity to metabolize humic substances of terrestrial origin. In addition, the demonstration that bacterial genomes replete with aromatic compound degradation genes exhibit a limited distribution outside of the Arctic Ocean suggests that processing humic substances is an adaptive trait of the Arctic Ocean microbiome. Future increases in terrestrial organic matter input to the Arctic Ocean may increase the prominence of aromatic compound processing bacteria and their contribution to Arctic carbon and nutrient cycles. Video Abstract.
Collapse
Affiliation(s)
- Thomas Grevesse
- Department of Biology, Concordia University, 7141 Sherbrooke St. West, Montreal, QC, H4B 1R6, Canada
| | - Céline Guéguen
- Department of Chemistry, Sherbrooke University, 2500 Blvd de l'Université, Sherbrooke, QC, J1K 2R1, Canada
| | - Vera E Onana
- Department of Biology, Concordia University, 7141 Sherbrooke St. West, Montreal, QC, H4B 1R6, Canada
| | - David A Walsh
- Department of Biology, Concordia University, 7141 Sherbrooke St. West, Montreal, QC, H4B 1R6, Canada.
| |
Collapse
|
2
|
Role of Seasons in the Fate of Dissolved Organic Carbon and Nutrients in a Large-Scale Surface Flow Constructed Wetland. WATER 2022. [DOI: 10.3390/w14091474] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
The role of seasons in the removal of dissolved organic carbon (DOC), nutrients and in changes in the spectral properties of dissolved organic matter (DOM) in a large-scale surface flow constructed wetland (SF-CW) receiving reclaimed water and composed of three basins with different vegetation patterns was studied. Dissolved nitrogen removal efficiencies within the three basins in summer (>50%) and winter (<30%) were significantly different. SF-CW water is enriched in DOC in spring and summer with average outlet concentrations above 8 mg·L−1. UV-visible indices, such as the specific absorbance at 254 nm or the spectral slope between 275 and 295 nm, did not vary over the seasons; thus, the basins did not change DOM aromaticity and average molecular weight. Synchronous fluorescence spectra showed variations in terms of protein-like and humic-like substances, the latter being more sensitive to photodegradation. A lab-scale photodegradation experiment confirmed that radiation from the sun was responsible for this decrease, showing this process could alter the composition of DOM at full-scale. DOM variations result from a seasonal competition between release by vegetation and photodegradation. These results validate the necessity for long-term monitoring of SF-CWs, and the utility of rapid optical methods to monitor DOC.
Collapse
|
3
|
Ma K, Powers LC, Seppälä J, Norkko J, Brandes JA. Effects of Added Humic Substances and Nutrients on Photochemical Degradation of Dissolved Organic Matter in A Mesocosm Amendment Experiment in the Gulf of Finland, Baltic Sea. Photochem Photobiol 2022; 98:1025-1042. [PMID: 35088423 DOI: 10.1111/php.13597] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2021] [Accepted: 01/21/2022] [Indexed: 11/28/2022]
Abstract
Humic substances, a component of terrestrial dissolved organic matter (tDOM), contribute to dissolved organic matter (DOM) and chromophoric DOM (CDOM) in coastal waters, and have significant impacts on biogeochemistry. There are concerns in recent years over browning effects in surface waters, due to increasing tDOM inputs, and their negative impacts on aquatic ecosystems, but relatively little work has been published on estuaries and coastal waters. Photodegradation could be a significant sink for tDOM in coastal environments, but the rates and efficiencies are poorly constrained. We conducted large-scale DOM photodegradation experiments in mesocosms amended with humic substances and nutrients in the Gulf of Finland to investigate the potential of photochemistry to remove added tDOM and the interactions of DOM photochemistry with eutrophication. The added tDOM was photodegraded rapidly, as CDOM absorption decreased and spectral slopes increased with increasing photons absorbed in laboratory experiments. The in situ DOM optical properties became similar amongst the control, humic-, and humic+nutrients-amended mesocosm samples towards the end of the amendment experiment, indicating degradation of the excess CDOM/DOM through processes including photodegradation. Nutrient additions didn't significantly influence the effects of added humic substances on CDOM optical property changes, but induced changes in DOM removal.
Collapse
Affiliation(s)
- Kun Ma
- Skidaway Institute of Oceanography, Department of Marine Sciences, University of Georgia, Savannah, GA, USA
| | - Leanne C Powers
- Skidaway Institute of Oceanography, Department of Marine Sciences, University of Georgia, Savannah, GA, USA.,Department of Chemistry, State University of New York, College of Environmental Science and Forestry, Syracuse, NY, USA
| | - Jukka Seppälä
- Finnish Environment Institute, Marine Research Centre, Helsinki, Finland
| | - Joanna Norkko
- Tvärminne Zoological Station, University of Helsinki, Hanko, Finland
| | - Jay A Brandes
- Skidaway Institute of Oceanography, Department of Marine Sciences, University of Georgia, Savannah, GA, USA
| |
Collapse
|
4
|
Shirokova LS, Chupakov AV, Ivanova IS, Moreva OY, Zabelina SA, Shutskiy NA, Loiko SV, Pokrovsky OS. Lichen, moss and peat control of C, nutrient and trace metal regime in lakes of permafrost peatlands. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 782:146737. [PMID: 33838368 DOI: 10.1016/j.scitotenv.2021.146737] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2021] [Revised: 03/10/2021] [Accepted: 03/21/2021] [Indexed: 06/12/2023]
Abstract
Permafrost thaw in continental lowlands produces large number of thermokarst (thaw) lakes, which act as a major regulator of carbon (C) storage in sediments and C emission in the atmosphere. Here we studied thaw lakes of the NE European permafrost peatlands - shallow water bodies located within frozen peat bogs and receiving the majority of their water input from lateral (surface) runoff. We also conducted mesocosm experiments via interacting lake waters with frozen peat and dominant ground vegetation - lichen and moss. There was a systematic decrease in concentrations of dissolved C, CO2, nutrients and metals with an increase in lake size, corresponding to temporal evolution of the water body and thermokarst development. We hypothesized that ground vegetation and frozen peat provide the majority of C, nutrients and inorganic solutes in the water column of these lakes, and that microbial processing of terrestrial organic matter controls the pattern of CO2 and nutrient concentrations in thermokarst lakes. Substrate mass-normalized C, nutrient (N, P, K), major and trace metal release was maximal in moss mesocosms. After first 16 h of reaction, the pCO2 increased ten-fold in mesocosms with moss and lichen; this increase was much less pronounced in experiments with permafrost peat. Overall, moss and lichen were the dominant factors controlling the enrichment of the lake water in organic C, nutrients, and trace metals and rising the CO2 concentration. The global significance of obtained results is that the changes in ground vegetation, rather than mere frozen peat thawing, may exert the primary control on C, major and trace element balance in aquatic ecosystems of tundra peatlands under climate warming scenario.
Collapse
Affiliation(s)
- Liudmila S Shirokova
- GET (Géosciences Environnement Toulouse) UMR 5563 CNRS, University of Toulouse, 14 Avenue Edouard Belin, 31400 Toulouse, France; Institute of Ecological Problems of the North, Federal Center of Arctic Research, 23 Nab. Severnoi Dviny, Arkhangelsk, Russia
| | - Artem V Chupakov
- Institute of Ecological Problems of the North, Federal Center of Arctic Research, 23 Nab. Severnoi Dviny, Arkhangelsk, Russia
| | - Irina S Ivanova
- Tomsk branch of the Trofimuk Institute of Petroleum Geology and Geophysics, SB RAS, Tomsk, Akademichesky 4, 634055 Tomsk, Russia
| | - Olga Y Moreva
- Institute of Ecological Problems of the North, Federal Center of Arctic Research, 23 Nab. Severnoi Dviny, Arkhangelsk, Russia
| | - Svetlana A Zabelina
- Institute of Ecological Problems of the North, Federal Center of Arctic Research, 23 Nab. Severnoi Dviny, Arkhangelsk, Russia
| | - Nikita A Shutskiy
- Lomonosov Northern (Arctic) Federal University, 17, Nab. Northern Dvina, 163002 Arkhangelsk, Russia
| | - Sergey V Loiko
- BIO-GEO-CLIM Laboratory, Tomsk State University, 35 Lenina, Tomsk, Russia
| | - Oleg S Pokrovsky
- GET (Géosciences Environnement Toulouse) UMR 5563 CNRS, University of Toulouse, 14 Avenue Edouard Belin, 31400 Toulouse, France.
| |
Collapse
|
5
|
Zhou Y, He D, He C, Li P, Fan D, Wang A, Zhang K, Chen B, Zhao C, Wang Y, Shi Q, Sun Y. Spatial changes in molecular composition of dissolved organic matter in the Yangtze River Estuary: Implications for the seaward transport of estuarine DOM. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 759:143531. [PMID: 33243497 DOI: 10.1016/j.scitotenv.2020.143531] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2020] [Revised: 10/19/2020] [Accepted: 10/20/2020] [Indexed: 06/11/2023]
Abstract
The complexity of dissolved organic matter (DOM) limits our understanding of the estuarine carbon cycle. This study adopted a combination of bulk carbon isotope, optical techniques and ultra-high resolution mass spectrometry to study the spatial heterogeneity and compositional variations of DOM across a latitudinal transect of the Yangtze River Estuary (YRE). Results show that the whole section of YRE received high abundance of protein-like C4 fluorescent component (0.66 ± 0.08 R.U.) and high relative abundance of aliphatic compounds and peptides (8.28 ± 1.46%) from phytoplankton, which would contribute to the bioavailable DOM pool of the Eastern China Sea (ECS). However, multivariate analysis indicated that polycyclic aromatics and polyphenols from the Yangtze River experienced a significant decrease of 5% within the turbidity zone, creating a significant decrease of 0.08 in aromaticity index and modulating DOM content and compositions within the YRE. 1837 molecular formulae were identified to track dynamic behaviors of terrestrial DOM in the YRE. Molecular imprints showed the removal of terrestrial molecules in the turbidity zone indicated by the decrease of 753 in molecular quantity, when water masses mixing diluted the abundance of aromatic compounds. Adsorption and flocculation could serve important mechanisms to remove terrestrial DOM, promoting the burial of terrestrial DOM within estuarine sediments. Besides, some terrestrial molecular formulae were also detected in the ECS, suggesting the potential contribution of terrestrial DOM to the carbon stock of open seas after experiencing physical and photochemical transformations. This research provides a comprehensive insight into spatial variations of estuarine DOM composition, underlining the important role of estuaries in sorting and transporting DOM.
Collapse
Affiliation(s)
- Yuping Zhou
- Organic Geochemistry Unit, Key Laboratory of Geoscience Big Data and Deep Resource of Zhejiang Province, School of Earth Sciences, Zhejiang University, Hangzhou, China
| | - Ding He
- Organic Geochemistry Unit, Key Laboratory of Geoscience Big Data and Deep Resource of Zhejiang Province, School of Earth Sciences, Zhejiang University, Hangzhou, China; State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou, China.
| | - Chen He
- State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Changping District, Beijing, China
| | - Penghui Li
- School of Marine Sciences, Sun Yat-sen University, Zhuhai, China
| | - Daidu Fan
- College of Marine Sciences, Tongji University, Shanghai, China
| | - Anyue Wang
- Organic Geochemistry Unit, Key Laboratory of Geoscience Big Data and Deep Resource of Zhejiang Province, School of Earth Sciences, Zhejiang University, Hangzhou, China
| | - Kai Zhang
- Organic Geochemistry Unit, Key Laboratory of Geoscience Big Data and Deep Resource of Zhejiang Province, School of Earth Sciences, Zhejiang University, Hangzhou, China
| | - Baoshan Chen
- School of Marine Science and Policy, University of Delaware, Newark, DE, United States
| | - Chen Zhao
- Organic Geochemistry Unit, Key Laboratory of Geoscience Big Data and Deep Resource of Zhejiang Province, School of Earth Sciences, Zhejiang University, Hangzhou, China
| | - Yuntao Wang
- State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou, China
| | - Quan Shi
- State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Changping District, Beijing, China
| | - Yongge Sun
- Organic Geochemistry Unit, Key Laboratory of Geoscience Big Data and Deep Resource of Zhejiang Province, School of Earth Sciences, Zhejiang University, Hangzhou, China
| |
Collapse
|
6
|
Factors controlling the distributions of dissolved organic matter in the East China Sea during summer. Sci Rep 2020; 10:11854. [PMID: 32678257 PMCID: PMC7366708 DOI: 10.1038/s41598-020-68863-w] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2020] [Accepted: 06/26/2020] [Indexed: 11/08/2022] Open
Abstract
To determine the distribution of dissolved organic matter (DOM) in the East China Sea (ECS) during the summer, we measured the dissolved organic carbon (DOC) and nitrogen (DON), fluorescent dissolved organic matter (FDOM), and chlorophyll a (Chl. a) in the upper 100-m layer of this region during July and September 2015. The DOC (r2 = 0.72 and 0.78 in July and September, respectively) and DON (r2 = 0.43 and 0.33) were significantly correlated with salinity, suggesting that the river is the primary origin of DOM. However, we found that at a DOC “pulse” under a salinity ranging from 24 to 35, the extrapolating DOC values (304 ± 11 μM) were twice higher than those with a salinity of close to 0, as found in a previous study. The excess DOC concentration seemed to be attributed to the microbial metabolism during transport from the estuary based on the good relationships between DOC and marine humic-like FDOM (r2 = 0.42 and 0.47), as well as the fluorescence, humification, and biological indexes, but showed no correlation with Chl. a. Thus, the results of our study indicate that microbial activities can be a significant factor controlling the distribution of DOM in the ECS during summer.
Collapse
|
7
|
Drozdova OY, Aleshina AR, Tikhonov VV, Lapitskiy SA, Pokrovsky OS. Coagulation of organo-mineral colloids and formation of low molecular weight organic and metal complexes in boreal humic river water under UV-irradiation. CHEMOSPHERE 2020; 250:126216. [PMID: 32087384 DOI: 10.1016/j.chemosphere.2020.126216] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/03/2019] [Revised: 02/11/2020] [Accepted: 02/13/2020] [Indexed: 06/10/2023]
Abstract
Photodegradation of dissolved organic matter (DOM) is highly important in humic waters of peatland regions, yet the coupling between organic and organo-mineral colloids, trace metals and bioavailability of photodegraded products is poorly known. Here we studied photo-destruction of organo-mineral colloids induced by UV-irradiation of sterile-filtered mire water. We revealed two simultaneously occurring processes of transformation of DOM and trace elements speciation: (i) disintegration of high molecular weight organo-mineral colloids into lower molecular weight (<1 kDa) DOM and metal complexes and (ii) formation of particulate (>0.22 μm) aggregates of metals and organic matter. Over 26 days of UV-irradiation, up to 20% of dissolved organic carbon from peat waters was transformed into CO2. In addition to transformation of organic compounds, sizeable change in speciation and size fractionation of many trace metals such as Fe, Pb, Cd, Co, Zn, Cu, V, La, Ni and Cr occurred. Although short-term (1 day) UV-irradiation of mire water stimulated growth of cultivable Pseudomonas sp. bacterium, the long-term exposure (26 days) of organic substrate had a negative effect on bacterial development. Therefore, while sizeable transformation of the organic and metal colloidal load of peat water may occur over first 10 days of UV-irradiation, the enhanced bioavailability of UV-treated substrate is achieved after first day of exposure. The present study demonstrates the importance of even short-term UV-irradiation on colloidal transformation and potential bioavailability of humic waters from temperate mires and highlights the need for more detailed study of coupled metal-organic matter transformation induced by sunlight exposure of mire waters.
Collapse
Affiliation(s)
- O Yu Drozdova
- Geological Faculty, Moscow State University, Leninskie Gory 1, 119234, Moscow, Russia.
| | - A R Aleshina
- Geological Faculty, Moscow State University, Leninskie Gory 1, 119234, Moscow, Russia; Scientific Geoinformation Center of Russian Academy of Sciences, New Arbat 11/1, 119019, Moscow, Russia
| | - V V Tikhonov
- Faculty of Soil Science, Moscow State University, Leninskie Gory 1/12, 119234, Moscow, Russia
| | - S A Lapitskiy
- Geological Faculty, Moscow State University, Leninskie Gory 1, 119234, Moscow, Russia
| | - O S Pokrovsky
- Geoscience and Environment Toulouse, UMR 5563 CNRS, University of Toulouse, 14 Avenue Edouard Belin, 31400, Toulouse, France; Institute of Ecological Problems of the North, N. Laverov Federal Center for Integrated Arctic Research, Nab. Severnoi Dviny 23, 163000, Arkhangelsk, Russia; BIO-GEO-CLIM Laboratory, Tomsk State University, Lenina Pr. 35, 634050, Tomsk, Russia
| |
Collapse
|
8
|
Valle J, Harir M, Gonsior M, Enrich-Prast A, Schmitt-Kopplin P, Bastviken D, Hertkorn N. Molecular differences between water column and sediment pore water SPE-DOM in ten Swedish boreal lakes. WATER RESEARCH 2020; 170:115320. [PMID: 31837638 DOI: 10.1016/j.watres.2019.115320] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2019] [Revised: 10/30/2019] [Accepted: 11/17/2019] [Indexed: 06/10/2023]
Abstract
Boreal lakes are considered hot spots of dissolved organic matter (DOM) processing within the global carbon cycle. This study has used FT-ICR mass spectrometry and comprehensive data evaluation to assess the molecular differences of SPE-DOM between lake column water SPE-DOM and sedimentary pore water SPE-DOM in 10 Swedish boreal lakes of the Malingsbo area, which were selected for their large diversity of physicochemical and morphological characteristics. While lake column water is well mixed and fairly oxygenated, sedimentary pore water is subject to depletion of oxygen and to confinement of molecules. Robust trends were deduced from molecular compositions present in all compartments and in all 10 lakes ("common compositions") with recognition of relative abundance. Sedimentary pore water SPE-DOM featured higher proportions of heteroatoms N and S, higher average H/C ratios in presence of higher DBE/C ratios, and higher average oxygenation than lake column water SPE-DOM. These trends were observed in all lakes except Ljustjärn, which is a ground water fed kettle lake with an unique lake biogeochemistry. Analogous trends were also observed in case of single or a few lakes and operated also for compounds present solely in either lake column water or sedimentary pore water. Unique compounds detected in either compartments and/or in a few lakes showed higher molecular diversity than the "common compositions". Processing of DOM molecules in sediments included selective preservation for polyphenolic compounds and microbial resynthesis of selected molecules of considerable diversity.
Collapse
Affiliation(s)
- Juliana Valle
- Helmholtz Zentrum Munich, German Research Center for Environmental Health, Research Unit Analytical Biogeochemistry (BGC), Ingolstädter Landstraße 1, P. O. Box 1129, D-85758, Neuherberg, Germany
| | - Mourad Harir
- Helmholtz Zentrum Munich, German Research Center for Environmental Health, Research Unit Analytical Biogeochemistry (BGC), Ingolstädter Landstraße 1, P. O. Box 1129, D-85758, Neuherberg, Germany; Technische Universität München, Chair Analytical Food Chemistry, Maximus-von-Imhof-Forum 2, D-85354, Freising, Weihenstephan, Germany
| | - Michael Gonsior
- University of Maryland Center for Environmental Science, Chesapeake Biological Laboratory, Solomons, USA
| | - Alex Enrich-Prast
- Linköping University, Department of Thematic Studies - Environmental Change, Linköping, Sweden; Federal University of Rio de Janeiro, Department of Botany, Rio de Janeiro, Brazil.
| | - Philippe Schmitt-Kopplin
- Helmholtz Zentrum Munich, German Research Center for Environmental Health, Research Unit Analytical Biogeochemistry (BGC), Ingolstädter Landstraße 1, P. O. Box 1129, D-85758, Neuherberg, Germany; Technische Universität München, Chair Analytical Food Chemistry, Maximus-von-Imhof-Forum 2, D-85354, Freising, Weihenstephan, Germany
| | - David Bastviken
- Linköping University, Department of Thematic Studies - Environmental Change, Linköping, Sweden
| | - Norbert Hertkorn
- Helmholtz Zentrum Munich, German Research Center for Environmental Health, Research Unit Analytical Biogeochemistry (BGC), Ingolstädter Landstraße 1, P. O. Box 1129, D-85758, Neuherberg, Germany.
| |
Collapse
|
9
|
Oleinikova OV, Poitrasson F, Drozdova OY, Shirokova LS, Lapitskiy SA, Pokrovsky OS. Iron Isotope Fractionation during Bio- and Photodegradation of Organoferric Colloids in Boreal Humic Waters. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2019; 53:11183-11194. [PMID: 31483618 DOI: 10.1021/acs.est.9b02797] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Biodegradation and photolysis of dissolved organic matter (DOM) in boreal high-latitude waters are the two main factors controlling not only the aquatic fluxes and residence time of carbon but also metal nutrients associated with DOM such as Fe. The DOM is usually present in the form of organic and organomineral colloids, which also account for the majority of dissolved Fe. Here, we use the stable Fe isotope approach to unravel the processes controlling Fe behavior during bio- and photodegradation of colloids in boreal Fe- and DOM-rich humic waters (a stream and a fen). The adsorption of Fe colloids onto heterotrophic bacteria Pseudomonas aureofaciens produced enrichment in +0.4‰ (δ57Fe) in the heavier isotopes of the cell surface relative to the remaining solution. In contrast, long-term assimilation of Fe by live cells yielded preferential incorporation of lighter isotopes into the cells (-0.7‰ relative to aqueous solution). The sunlight-induced oxidation of Fe(II) in fen water led to the removal of heavier Fe isotopes (+1.5 to +2.5‰) from solution, consistent with Fe(III) hydroxide precipitation from Fe(II)-bearing solution. Altogether, bio- and photodegradation of organoferric colloids, occurring within a few days of exposure time, can produce several per mil isotopic excursions in shallow lentic and lothic inland waters of high-latitude boreal regions. Considerable daily scale variations of Fe isotopic composition should therefore be taken into account during the interpretation of the riverine flux of Fe isotopes to the ocean or tracing weathering processes using Fe isotopes in surface waters at high latitudes.
Collapse
Affiliation(s)
- Olga V Oleinikova
- Geosciences and Environment Toulouse (GET), UMR 5563 CNRS , 14 Avenue Edouard Belin , 31400 Toulouse , France
| | - Franck Poitrasson
- Geosciences and Environment Toulouse (GET), UMR 5563 CNRS , 14 Avenue Edouard Belin , 31400 Toulouse , France
| | - Olga Yu Drozdova
- Geological Faculty of Moscow State University , 1 Leninskie Gory , 119234 Moscow , Russia
| | - Liudmila S Shirokova
- Geosciences and Environment Toulouse (GET), UMR 5563 CNRS , 14 Avenue Edouard Belin , 31400 Toulouse , France
- N. Laverov Federal Center for Integrated Arctic Research , Russian Academy of Science , 23 Naberezhnaya Sev Dviny , 163000 Arkhangelsk , Russia
| | - Sergey A Lapitskiy
- Geological Faculty of Moscow State University , 1 Leninskie Gory , 119234 Moscow , Russia
| | - Oleg S Pokrovsky
- Geosciences and Environment Toulouse (GET), UMR 5563 CNRS , 14 Avenue Edouard Belin , 31400 Toulouse , France
- N. Laverov Federal Center for Integrated Arctic Research , Russian Academy of Science , 23 Naberezhnaya Sev Dviny , 163000 Arkhangelsk , Russia
- BIO-GEO-CLIM Laboratory , Tomsk State University , 36 Lenina Avenue , 634050 Tomsk , Russia
| |
Collapse
|
10
|
Biaduń E, Nowak N, Kowalska J, Miecznikowski K, Krasnodębska-Ostręga B. Organic matter decomposition before arsenic speciation analysis of water sample - "Soft decomposition" using nano-photocatalysts. CHEMOSPHERE 2018; 207:481-488. [PMID: 29807347 DOI: 10.1016/j.chemosphere.2018.05.085] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/18/2018] [Revised: 05/09/2018] [Accepted: 05/14/2018] [Indexed: 06/08/2023]
Abstract
The applicability of photolysis in the speciation analysis of arsenic is investigated. The use of nano scale semiconductors (Fe2O3/WO3/Fe2O3 at pH 6) as an active film during solar light irradiation of a water sample, containing some surfactants (SDS), results in the simplification of the organic matter and gives no speciation change in the arsenic. The reproducibility of active layer is shown to be high and the surface roughness of each photoactive sample and photocurrent do not differ by more than 6 and less than 8%, respectively. The procedure of sample pretreatment caused a minimum (8-10%) amount of speciation change, whilst the irradiation is no longer that 2 h. The study indicates that "soft decomposition" can be performed for as long as 4 h, and still give photostable arsenates (III) and methylarsenate species. However, the saturation of the water sample with Ar is required (to reduce the oxygen content) for the longer the decomposition time being applied.
Collapse
Affiliation(s)
- Ewa Biaduń
- Faculty of Chemistry, University of Warsaw, ul. Pasteura 1, 02-093, Warsaw, Poland
| | - Natalia Nowak
- Faculty of Chemistry, University of Warsaw, ul. Pasteura 1, 02-093, Warsaw, Poland
| | - Joanna Kowalska
- Faculty of Chemistry, University of Warsaw, ul. Pasteura 1, 02-093, Warsaw, Poland
| | | | | |
Collapse
|