Sedimentary dynamics of coastal organic matter: An assessment of the porewater size/reactivity model by spectroscopic techniques

Dang, Duc Huy; Lenoble, Véronique; Durrieu, Guy; Mullot, Jean-Ulrich; Mounier, Stéphane; Garnier, Cédric

doi:10.1016/j.ecss.2014.10.002

Cited by 36 publications

(28 citation statements)

References 67 publications

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“…The higher content of DIC, nutrients, and H2S in the porewater of station 1I suggest the presence of higher diagenetic activities enhancing the release of this analytes which could result in a higher release of contaminants as already reported by several authors Dang et al 2014). , and Si-Si(OH) 4 were negative while P-PO 4 3− efflux was negligible at 1E and low at 1I.…”

Section: Discussionmentioning

confidence: 50%

Oxygen, carbon, and nutrient exchanges at the sediment–water interface in the Mar Piccolo of Taranto (Ionian Sea, southern Italy)

Vittor

Relitti

Kralj

et al. 2015

Environ Sci Pollut Res

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In the shallow environment, the nutrient and carbon exchanges at the sediment-water interface contribute significantly to determine the trophic status of the whole water column. The intensity of the allochthonous input in a coastal environment subjected to strong anthropogenic pressures determines an increase in the benthic oxygen demand leading to depressed oxygen levels in the bottom waters. Anoxic conditions resulting from organic enrichment can enhance the exchange of nutrients between sediments and the overlying water. In the present study, carbon and nutrient fluxes at the sediment-water interface were measured at two experimental sites, one highly and one moderately contaminated, as reference point. In situ benthic flux measurements of dissolved species (O2, DIC, DOC, N-NO3 (-), N-NO2 (-), N-NH4 (+), P-PO4 (3-), Si-Si(OH)4, H2S) were conducted using benthic chambers. Furthermore, undisturbed sediment cores were collected for analyses of total and organic C, total N, and biopolymeric carbon (carbohydrates, proteins, and lipids) as well as of dissolved species in porewaters and supernatant in order to calculate the diffusive fluxes. The sediments were characterized by suboxic to anoxic conditions with redox values more negative in the highly contaminated site, which was also characterized by higher biopolymeric carbon content (most of all lipids), lower C/N ratios and generally higher diffusive fluxes, which could result in a higher release of contaminants. A great difference was observed between diffusive and in situ benthic fluxes suggesting the enhancing of fluxes by bioturbation and the occurrence of biogeochemically important processes at the sediment-water interface. The multi-contamination of both inorganic and organic pollutants, in the sediments of the Mar Piccolo of Taranto (declared SIN in 1998), potentially transferable to the water column and to the aquatic trophic chain, is of serious concern for its ecological relevance, also considering the widespread fishing and mussel farming activities in the area.

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Section: Discussionmentioning

confidence: 50%

Oxygen, carbon, and nutrient exchanges at the sediment–water interface in the Mar Piccolo of Taranto (Ionian Sea, southern Italy)

Vittor

Relitti

Kralj

et al. 2015

Environ Sci Pollut Res

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“…A sediment core of ca. 50 cm was collected through the use of an interface corer (Plexiglas tube, 10 cm diameter and 1 m long), by Navy divers keeping undisturbed the bottom water column and the upper sediment column, and so preserving the water-sediment interface as described in Dang et al (2014Dang et al ( , 2015a, Tessier et al (2011). The collected sediment core was maintained vertically and was carefully transferred (by boat and then van) to the laboratory before being installed on a home-made slicing table under glove box.…”

Section: Sediment Corementioning

confidence: 99%

“…Additionally, porewater measurements of pH, redox potential (Eh), dissolved organic carbon (DOC), dissolved inorganic carbon (DIC), total nitrogen (N T ), ammonium (NH 4 + ), soluble reactive phosphorus (SRP), silicate (Si(OH) 4 ), manganese (Mn T ), iron (Fe T ), sulfate (SO 4 2-) and total sulfide (ΣHS -) were taken to verify the redox status of these two sediments according to previously described procedures (Dang et al, 2014(Dang et al, , 2015a(Dang et al, , 2015b).…”

Section: Sediment Corementioning

confidence: 99%

“…Over the last decade, the dynamics of DOM in coastal waters has been evaluated through the study of its fluorescent fraction (FDOM). Recently, FDOM associated with marine or river sediments has been characterized, i.e., the FDOM from sediment pore waters (Burdige et al, 2004;Dang et al, 2014;Sierra et al, 2001) and from sediment particles (Brym et al, 2014;Dang et al, 2014;He et al, 2016), as well as FDOM released by coastal sediment resuspension (Komada et al, 2002). Hence, due to the influence of OM in PAH partitioning processes, it is generally observed that theoretical K oc , i.e., K oc predicted from their octanol-water partition coefficients (K ow ), are lower than measured K oc (Accardi-Dey and Gschwend, 2002;Fernandes et al, 1997).…”

Section: Introductionmentioning

confidence: 99%

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Remobilization of polycyclic aromatic hydrocarbons and organic matter in seawater during sediment resuspension experiments from a polluted coastal environment: Insights from Toulon Bay (France)

Guigue

Tedetti

Dang

et al. 2017

Environmental Pollution

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Polycyclic aromatic hydrocarbons (PAHs) and organic matter contents were measured in seawater during resuspension experiments using sediments collected from Toulon Bay (Northwestern Mediterranean Sea, France). The studied sediments were very highly contaminated in PAHs, especially in 4-ring compounds emitted from combustion processes. The sediments used for resuspension experiments were collected at 0-2 cm (diagenetically new organic matter, OM) and 30-32 cm depths (diagenetically transformed OM). They were both mostly composed of fine particles (<63 μm), enriched in organic carbon (8.2 and 6.3%, respectively) and in PAHs (concentration of Σ34 PAHs: 38.2 and 35.7 × 10 ng g, respectively). The resuspension of these sediments led to an increase in concentrations of dissolved Σ34 PAHs, dissolved organic carbon (DOC) and dissolved humic- and tryptophan-like fluorophores in seawater up to 10-, 1.3-, 4.4- and 5.7-fold, respectively. The remobilization in seawater was higher for 4-6 ring PAHs, especially benzo(g,h,i)perylene, whose concentration exceeded the threshold values of the European Water Framework Directive. This noted the potential harmful effects of sediment resuspension on marine biota. From these sediment resuspension experiments, we determined OC-normalized partition coefficients of PAHs between sediment and water (K) and found that during such events, the transfer of PAHs from sediment particles to seawater was lower than that predicted from octanol-water partition coefficients (K) (i.e., measured K > K predicted from K). The results confirmed the sequestration role of sedimentary OC quality and grain size on PAHs; the OM diagenetic state seemed to impact the partition process but in a relatively minor way. Furthermore, differences were observed between 2-4 ring and 5-6 ring PAHs, with the latter displaying a relatively higher mobility towards seawater. These differences may be explained by the distribution of these two PAH pools within different OM moieties, such as humic substances and black carbon.

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“…However, many researchers have used optical methods, such as fluorescence spectroscopy and ultraviolet-visible absorption, which were also used in the qualitative characterization of organic matter in water bodies such as lakes and reservoirs (NGUYEN;HUR, 2011;HESTIR et al, 2015), regions with strong presence of urbanization (HUR; KONG, 2008;LOPARDO;AZEVEDO, 2008;SANTOS et al, 2011;BEM et al, 2013;MENG et al, 2013;DONG et al, 2014;KNAPIK;AZEVEDO, 2014;YU et al, 2015) and oceanic regions (DANG et al, 2014;YAMASHITA et al, 2015). Additionally, researchers have performed comparisons between water bodies' characteristics in different aquatic (WEISHAAR et al, 2003) environments.…”

Section: Introductionmentioning

confidence: 99%

Quali-quantitative characterization of organic matter in urbanized drainage basins as a basis for the application of Water Resources Management Instruments

Leithold

Fernandes

Knapik

et al. 2017

RBRH

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The challenge imposed by law no. 9433/97 to establish mechanisms for the recovery of bodies of water led to a dynamic of research that could guarantee not only an adequate understanding of the management instruments but also the technical basis for their application. In this research, emphasis was placed on understanding the dynamics of organic matter (OM) in a drainage basin heavily influenced by anthropogenic activities, through the analysis and interpretation of qualitative and quantitative information. The case study was the Iguaçu River basin, from its headwaters in the Metropolitan Region of Curitiba (MRC) to the municipality of União da Vitória . The results obtained showed a large deposition of labile OM in the MRC coming probably from domestic effluents, with consequent DO depletion and water quality degradation. However, after the more urbanized region, there is a reduction in the concentration of OM and the indication of the predominance of pedogenic material, suggesting that in addition to the dilution effect, there is less input of anthropogenic effluents in this region, which results in an improvement in water quality, represented mainly by the recovery of the DO concentration. The combined use of quantitative data and UV-visible spectroscopy was fundamental to comprehend the variation in the characteristics of OM and its sources along the studied section.Keywords: Water quality; UV-Visible; Urban basins; Iguaçu River. RESUMOO desafio imposto pela lei n. 9433/97 de estabelecer mecanismos de recuperação de corpos hídricos induziu a uma dinâmica de pesquisas que pudessem garantir, não só o adequado entendimento dos instrumentos de gestão, mas a fundamentação técnica necessária à sua aplicação. Nesta pesquisa, ênfase foi dada na compreensão da dinâmica da MO em bacia hidrográfica fortemente influenciada pelas atividades antrópicas, através da análise e interpretação conjunta de informações qualitativas e quantitativas. O estudo de caso abordado foi a bacia do rio Rio Iguaçu e os resultados obtidos demonstraram grande aporte de MO lábil na RMC proveniente provavelmente de efluentes domésticos, com consequente depleção do OD e degradação da qualidade das águas. No entanto, após a região mais urbanizada há redução da concentração de MO e a indicação da predominância de material pedogênico, sugerindo que além do efeito de diluição, há menor aporte de efluentes antrópicos nesta região, o que resulta numa melhoria da qualidade das águas, representada principalmente pela recuperação da concentração do OD. A utilização conjunta dos dados quantitativos e da espectroscopia de UV-visível foi fundamental para compreender a variação nas características da MO e de suas fontes ao longo do trecho estudado. Palavras-Chave:Qualidade da água; Uv-Visível; Bacias urbanas; Rio Iguaçu.

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Sedimentary dynamics of coastal organic matter: An assessment of the porewater size/reactivity model by spectroscopic techniques

Cited by 36 publications

References 67 publications

Oxygen, carbon, and nutrient exchanges at the sediment–water interface in the Mar Piccolo of Taranto (Ionian Sea, southern Italy)

Oxygen, carbon, and nutrient exchanges at the sediment–water interface in the Mar Piccolo of Taranto (Ionian Sea, southern Italy)

Remobilization of polycyclic aromatic hydrocarbons and organic matter in seawater during sediment resuspension experiments from a polluted coastal environment: Insights from Toulon Bay (France)

Quali-quantitative characterization of organic matter in urbanized drainage basins as a basis for the application of Water Resources Management Instruments

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