Behaviour of Organic Carbon in Nine Contrasting European Estuaries

Abril, Gwénaël; Nogueira, Marta; Etcheber, Henri; Cabeçadas, G.; Lemaire, Emmanuelle; Brogueira, Maria José

doi:10.1006/ecss.2001.0844

Cited by 347 publications

(276 citation statements)

References 44 publications

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“…microtidal estuaries) are especially vulnerable to those inputs. Aside of the hydrodynamic patterns, common processes for all estuaries which are considered in order to understand and explain the spatiotemporal distributions of trace metals primarily encompass adsorption/desorption, flocculation, biological uptake, sediment resuspension, as well as organic/inorganic complexation alongside with the competitive effects of major cations/anions (Abril et al, 2002;Dassenakis et al, 1995;Elbaz-Poulichet et al, 1996;Hatje et al, 2003b;Louis et al, 2009;Oursel et al, 2013;Rigaud et al, 2013;Waeles et al, 2009). …”

Section: Introductionmentioning

confidence: 99%

Evidencing the natural and anthropogenic processes controlling trace metals dynamic in a highly stratified estuary: The Krka River estuary (Adriatic, Croatia)

Cindrić

Garnier

Oursel

et al. 2015

Marine Pollution Bulletin

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Distributions of trace metals (TM), organic carbon, SPM and physico-chemical parameters were studied in the highly stratified Krka River estuary in winter/summer periods. The nonconservative behaviour of Zn, Cd, Pb and Cu in the brackish layer (plume), easily spotted due to very low inputs by the river, was mainly caused by their inputs from the pleasure boats, nautical marinas and harbour (e.g. release from antifouling paints). Contrarily, Ni and Co followed near-conservative behaviour. The extremely low SPM discharged by the river,

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Section: Introductionmentioning

confidence: 99%

Evidencing the natural and anthropogenic processes controlling trace metals dynamic in a highly stratified estuary: The Krka River estuary (Adriatic, Croatia)

Cindrić

Garnier

Oursel

et al. 2015

Marine Pollution Bulletin

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“…This process is particularly significant in systems that contain high levels of anthropogenic DOC, as in the Scheldt estuary. 50 The removal in the intermediate region of the estuary could be attributed to flocculation of fluorescent organic matter from terrestrial origins due to the effect of increased salinity. Similar behavior was found by Callahan et al 51 in the estuary of the Pearl River (China).…”

Section: Variation Of Fluorescence Intensity and Doc Along The Estuarymentioning

confidence: 99%

“…The organic compounds released then result in an increase of fluorescence intensity, relative to that which would be expected in the presence of dilution alone. 32,50 In estuarine regions, DOM is influenced by a variety of physical processes, and both conservative and nonconservative behavior has been observed. 26,28,32,49 In estuaries along the southwest coast of Florida, located in the Ten Thousands Island and Whitewaste Bay, DOC showed a conservative behavior during the dry period in the years 2001 and 2002.…”

Section: Variation Of Fluorescence Intensity and Doc Along The Estuarymentioning

confidence: 99%

“…32 Similar results were found in the estuaries of the Tamar (England), Sado (Portugal) and Ems (The Netherlands), where DOC showed the same non-conservative behavior, with production during the summer. 50,52 To explain these deviations, the authors attributed the increased concentrations of DOC to desorption of organic compounds from particulate matter in the maximum turbidity zone, or the resuspension of bottom sediment. For the regions of average salinity, there is a decrease in the concentration of DOC with dilution, accentuated by increased consumption of organic matter in these regions.…”

Section: Variation Of Fluorescence Intensity and Doc Along The Estuarymentioning

confidence: 99%

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Characterization of dissolved organic matter in the Piauí river estuary, Northeast Brazil

Costa¹,

Passos²,

Garcia³

et al. 2011

J. Braz. Chem. Soc.

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A espectroscopia de fluorescência e o carbono orgânico dissolvido (COD) foram utilizados para caracterização da matéria orgânica dissolvida (MOD) no estuário do Rio Piauí, um estuário tropical situado no Estado de Sergipe, nordeste do Brasil. As intensidades de fluorescência foram maiores no período chuvoso e menores no período seco, evidenciando que a variabilidade das propriedades fluorescentes da MOD é ditada, principalmente, pela descarga fluvial e pelo processo de diluição no estuário. No período chuvoso, os compostos tipo triptofano e húmicos predominaram na composição da MOD, enquanto no período seco ocorreu um aumento significativo dos constituintes tipo proteínas. As relações das intensidades de fluorescência com a salinidade sugerem um comportamento não conservativo para a MOD fluorescente. O COD mostrou um comportamento conservativo no período seco e não conservativo no período chuvoso, com produção de COD na parte superior do estuário. A complexação da MOD com o Cu(II), estudada usando a técnica de supressão da fluorescência, evidenciou o potencial de complexação dos fluoróforos tipo proteínas, tripofano e húmico.Fluorescence spectroscopy and dissolved organic carbon (DOC) measurements were used to characterize the dissolved organic matter (DOM) in the Piauí River estuary, a tropical estuary situated in the State of Sergipe, Northeast Brazil. Fluorescence intensities were greater during the rainy period than the dry period, demonstrating that variability in the fluorescence properties of the DOM was determined mainly by the fluvial discharge and the dilution processes occurring in the estuary. During the rainy period, tryptophan-like and humic substances were the main components of the DOM, while during the dry period there was a significant increase of proteinlike constituents. Relationships identified between fluorescence intensities and salinity were indicative of non-conservative behavior of the fluorescent DOM. DOC showed behavior that was conservative during the dry period, and non-conservative during the rainy period, with production of DOC in the upper reaches of the estuary. The complexation of DOM with Cu(II), studied using the fluorescence suppression technique, showed the complexation potentials of protein, tryptophan and humic type fluorophores.Keywords: natural organic matter, Piauí River, estuary, fluorescence IntroductionDissolved organic matter (DOM) is a complex heterogeneous mixture of macromolecules formed by the decomposition of biological material derived from animals or plants. DOM represents one of the main reservoirs of carbon on the Earth's surface, and exhibits a variety of ecologically and geochemically important properties including the ability to absorb light, bind with trace metals and organic pollutants, adsorb substances onto its surface and undergo aggregation, as well as photochemical reactivity. [1][2][3] The DOM present in natural waters can have either autochtone or allochtone origins. Allochtone organic matter is introduced into aquatic systems by leaching from ...

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“…During 1998 a new system for the treatment of domestic sewage was installed in the city of Oporto, presumably reducing the inputs of anthropogenic materials to the estuary, such that along the Oporto coast the concentrations of dissolved metals are relatively low (Vasconcelos and Leal, 1997). As a consequence, the Douro estuary has been classified as ''pristine'', as regards the organic carbon content of its waters (Abril et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

Mercury distribution in Douro estuary (Portugal)

Ramalhosa

Pereira

Vale

et al. 2005

Marine Pollution Bulletin

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Determinations of dissolved reactive and total dissolved mercury, particulate and sedimentary mercury, dissolved organic carbon (DOC), particulate organic carbon (POC) and suspended particulate matter (SPM) have been made in the estuary of river Douro, in northern Portugal. The estuary was stratified by salinity along most of its length, it had low concentrations of SPM, typically <20 mg dm À3 , and concentrations of DOC in the range <1.0-1.8 mg dm À3 . The surface waters had a maximum dissolved concentration of reactive mercury of about 10 ng dm À3 , whereas for the more saline bottom waters it was about 65 ng dm À3 . The surface waters had maximum concentrations of total suspended particulate mercury of $7 lg g À1 and the bottom waters were always <1 lg g À1 . Concentrations of mercury in sediments was low and in the range from 0.06 to 0.18 lg g À1 . The transport of mercury in surface waters was mainly associated with organic-rich particulate matter, while in bottom waters the dissolved phase transport of mercury is more important. Lower particulate organic matter, formation of chlorocomplexes in more saline waters and eventually the presence of colloids appear to explain the difference of mercury partitioning in Douro estuarine waters.

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Behaviour of Organic Carbon in Nine Contrasting European Estuaries

Cited by 347 publications

References 44 publications

Evidencing the natural and anthropogenic processes controlling trace metals dynamic in a highly stratified estuary: The Krka River estuary (Adriatic, Croatia)

Evidencing the natural and anthropogenic processes controlling trace metals dynamic in a highly stratified estuary: The Krka River estuary (Adriatic, Croatia)

Characterization of dissolved organic matter in the Piauí river estuary, Northeast Brazil

Mercury distribution in Douro estuary (Portugal)

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