خيارات البحث
النتائج 1041 - 1050 من 4,938
Profiling of main metabolites in root exudates and mucilage collected from maize submitted to cadmium stress النص الكامل
2019
Lapie, Clémentine | Leglize, Pierre | Paris, Cédric | Sterckeman, Thibault | Buisson, Tatiana | Laboratoire Sols et Environnement (LSE) ; Institut National de la Recherche Agronomique (INRA)-Université de Lorraine (UL) | Laboratoire d'Ingénierie des Biomolécules (LIBio) ; Université de Lorraine (UL) | Plateau d’Analyse Structurale et Métabolomique (PASM) ; Université de Lorraine (UL)
Profiling of main metabolites in root exudates and mucilage collected from maize submitted to cadmium stress النص الكامل
2019
Lapie, Clémentine | Leglize, Pierre | Paris, Cédric | Sterckeman, Thibault | Buisson, Tatiana | Laboratoire Sols et Environnement (LSE) ; Institut National de la Recherche Agronomique (INRA)-Université de Lorraine (UL) | Laboratoire d'Ingénierie des Biomolécules (LIBio) ; Université de Lorraine (UL) | Plateau d’Analyse Structurale et Métabolomique (PASM) ; Université de Lorraine (UL)
The aim of this study was to characterize qualitatively and quantitatively the composition of the main rhizodeposits emitted from maize (Zea mays) under Cd stress, in order to discuss their role in Cd availability and tolerance. Maize was grown for 6weeks in sand at four Cd exposure levels (0, 10, 20, and 40M Cd in nutrient solution) and two types of rhizodeposits were collected at the end of cultivation period. Mucilage and other molecules adhering to rhizospheric sand were extracted with a buffer before root exudates were collected by diffusion into water. Total carbon, proteins, amino acids, and sugars were analyzed for both rhizodeposit types and about 40 molecules were identified using GC-MS and LC-MS. Cadmium effect on plant morphology and functioning was slight, but consistent with previous works on Cd toxicity. However, rhizodeposition did tend to be impacted, with a decrease in total carbon, sugars, and amino acids correlating with an increasing Cd content. Such a decrease was not noticeable for proteins in root exudates. These observations were confirmed by the same trends in individual compound contents, although the results were generally not statistically significant. Many of the molecules determined are well-known to modify, whether directly or indirectly, Cd speciation and dynamics in the soil and could play a role in Cd tolerance.
اظهر المزيد [+] اقل [-]Profiling of main metabolites in root exudates and mucilage collected from maize submitted to cadmium stress النص الكامل
2019
Lapie, Clémentine | Leglize, Pierre | Paris, Cédric | Buisson, Tatiana | Sterckeman, Thibault
The aim of this study was to characterize qualitatively and quantitatively the composition of the main rhizodeposits emitted from maize (Zea mays) under Cd stress, in order to discuss their role in Cd availability and tolerance. Maize was grown for 6 weeks in sand at four Cd exposure levels (0, 10, 20, and 40 μM Cd in nutrient solution) and two types of rhizodeposits were collected at the end of cultivation period. Mucilage and other molecules adhering to rhizospheric sand were extracted with a buffer before root exudates were collected by diffusion into water. Total carbon, proteins, amino acids, and sugars were analyzed for both rhizodeposit types and about 40 molecules were identified using GC-MS and LC-MS. Cadmium effect on plant morphology and functioning was slight, but consistent with previous works on Cd toxicity. However, rhizodeposition did tend to be impacted, with a decrease in total carbon, sugars, and amino acids correlating with an increasing Cd content. Such a decrease was not noticeable for proteins in root exudates. These observations were confirmed by the same trends in individual compound contents, although the results were generally not statistically significant. Many of the molecules determined are well-known to modify, whether directly or indirectly, Cd speciation and dynamics in the soil and could play a role in Cd tolerance.
اظهر المزيد [+] اقل [-]Biochar as low-cost sorbent of volatile fuel organic compounds: potential application to water remediation النص الكامل
2019
Saiz-Rubio, Ruth | Balseiro-Romero, María | Antelo, Juan | Díez, Elena | Fiol, Sarah | Macías, Felipe | Universidade de Santiago de Compostela [España] = University of Santiago de Compostela [Spain] = Université de Saint-Jacques-de-Compostelle [Espagne] (USC) | Ecologie fonctionnelle et écotoxicologie des agroécosystèmes (ECOSYS) ; Institut National de la Recherche Agronomique (INRA)-AgroParisTech
Biochar as low-cost sorbent of volatile fuel organic compounds: potential application to water remediation النص الكامل
2019
Saiz-Rubio, Ruth | Balseiro-Romero, María | Antelo, Juan | Díez, Elena | Fiol, Sarah | Macías, Felipe | Universidade de Santiago de Compostela [España] = University of Santiago de Compostela [Spain] = Université de Saint-Jacques-de-Compostelle [Espagne] (USC) | Ecologie fonctionnelle et écotoxicologie des agroécosystèmes (ECOSYS) ; Institut National de la Recherche Agronomique (INRA)-AgroParisTech
International audience | Pyrolysis of waste materials to produce biochar is an excellent and suitable alternative supporting a circular bio-based economy. One of the properties attributed to biochar is the capacity for sorbing organic contaminants, which is determined by its composition and physicochemical characteristics. In this study, the capacity of waste-derived biochar to retain volatile fuel organic compounds (benzene, toluene, ethylbenzene and xylene (BTEX) and fuel oxygenates (FO)) from artificially contaminated water was assessed using batch-based sorption experiments. Additionally, the sorption isotherms were established. The results showed significant differences between BTEX and FO sorption on biochar, being the most hydrophobic and non-polar contaminants those showing the highest retention. Furthermore, the sorption process reflected a multilayer behaviour and a relatively high sorption capacity of the biochar materials. Langmuir and Freundlich models were adequate to describe the experimental results and to detect general differences in the sorption behaviour of volatile fuel organic compounds. It was also observed that the feedstock material and biochar pyrolysis conditions had a significant influence in the sorption process. The highest sorption capacity was found in biochars produced at high temperature (> 400 °C) and thus rich in aromatic C, such as eucalyptus and corn cob biochars. Overall, waste-derived biochar offers a viable alternative to be used in the remediation of volatile fuel organic compounds from water due to its high sorption capacity.
اظهر المزيد [+] اقل [-]Biochar as low-cost sorbent of volatile fuel organic compounds: potential application to water remediation النص الكامل
2019
Saiz-Rubio, Ruth | Balseiro-Romero, María | Antelo, Juan | Díez, Elena | Fiol, Sarah | Macías, Felipe
Pyrolysis of waste materials to produce biochar is an excellent and suitable alternative supporting a circular bio-based economy. One of the properties attributed to biochar is the capacity for sorbing organic contaminants, which is determined by its composition and physicochemical characteristics. In this study, the capacity of waste-derived biochar to retain volatile fuel organic compounds (benzene, toluene, ethylbenzene and xylene (BTEX) and fuel oxygenates (FO)) from artificially contaminated water was assessed using batch-based sorption experiments. Additionally, the sorption isotherms were established. The results showed significant differences between BTEX and FO sorption on biochar, being the most hydrophobic and non-polar contaminants those showing the highest retention. Furthermore, the sorption process reflected a multilayer behaviour and a relatively high sorption capacity of the biochar materials. Langmuir and Freundlich models were adequate to describe the experimental results and to detect general differences in the sorption behaviour of volatile fuel organic compounds. It was also observed that the feedstock material and biochar pyrolysis conditions had a significant influence in the sorption process. The highest sorption capacity was found in biochars produced at high temperature (> 400 °C) and thus rich in aromatic C, such as eucalyptus and corn cob biochars. Overall, waste-derived biochar offers a viable alternative to be used in the remediation of volatile fuel organic compounds from water due to its high sorption capacity.
اظهر المزيد [+] اقل [-]Individual variability in contaminants and physiological status in a resident Arctic seabird species النص الكامل
2019
Eckbo, Norith | Le Bohec, Céline | Planas-bielsa, Victor | Warner, Nicholas A. | Schull, Quentin | Herzke, Dorte | Zahn, Sandrine | Haarr, Ane | Gabrielsen, Geir W. | Borgå, Katrine
Individual variability in contaminants and physiological status in a resident Arctic seabird species النص الكامل
2019
Eckbo, Norith | Le Bohec, Céline | Planas-bielsa, Victor | Warner, Nicholas A. | Schull, Quentin | Herzke, Dorte | Zahn, Sandrine | Haarr, Ane | Gabrielsen, Geir W. | Borgå, Katrine
While migratory seabirds dominate ecotoxicological studies within the Arctic, there is limited knowledge about exposure and potential effects from circulating legacy and emerging contaminants in species who reside in the high-Arctic all year round. Here, we focus on the case of the Mandt's Black guillemot (Cepphus grylle mandtii) breeding at Kongsfjorden, Svalbard (79.00°N, 11.66°E) and investigate exposure to legacy and emerging contaminants in relation to individual physiological status, i.e. body condition, oxidative stress and relative telomere length. Despite its benthic-inshore foraging strategy, the Black guillemot displayed overall similar contaminant concentrations in blood during incubation (∑PCB11 (15.7 ng/g w.w.) > ∑PFAS5 (9.9 ng/g w.w.) > ∑Pesticides9 (6.7 ng/g w.w.) > ∑PBDE4 (2.7 ng/g w.w.), and Hg (0.3 μg/g d.w.) compared to an Arctic migratory seabird in which several contaminant-related stress responses have been observed. Black guillemots in poorer condition tended to display higher levels of contaminants, higher levels of reactive oxygen metabolites, lower plasmatic antioxidant capacity, and shorter telomere lengths; however the low sample size restrict any strong conclusions. Nevertheless, our data suggests that nonlinear relationships with a threshold may exist between accumulated contaminant concentrations and physiological status of the birds. These findings were used to build a hypothesis to be applied in future modelling for describing how chronic exposure to contaminants may be linked to telomere dynamics.
اظهر المزيد [+] اقل [-]Individual variability in contaminants and physiological status in a resident Arctic seabird species النص الكامل
2019
Eckbo, Norith | Le Bohec, Céline | Planas-Bielsa, Victor | Warner, Nicholas A. | Schull, Quentin | Herzke, Dorte | Zahn, Sandrine | Haarr, Ane | Gabrielsen, Geir W. | Borgå, Katrine
While migratory seabirds dominate ecotoxicological studies within the Arctic, there is limited knowledge about exposure and potential effects from circulating legacy and emerging contaminants in species who reside in the high-Arctic all year round. Here, we focus on the case of the Mandt's Black guillemot (Cepphus grylle mandtii) breeding at Kongsfjorden, Svalbard (79.00°N, 11.66°E) and investigate exposure to legacy and emerging contaminants in relation to individual physiological status, i.e. body condition, oxidative stress and relative telomere length. Despite its benthic-inshore foraging strategy, the Black guillemot displayed overall similar contaminant concentrations in blood during incubation (∑PCB11 (15.7 ng/g w.w.) > ∑PFAS5 (9.9 ng/g w.w.) > ∑Pesticides9 (6.7 ng/g w.w.) > ∑PBDE4 (2.7 ng/g w.w.), and Hg (0.3 μg/g d.w.) compared to an Arctic migratory seabird in which several contaminant-related stress responses have been observed. Black guillemots in poorer condition tended to display higher levels of contaminants, higher levels of reactive oxygen metabolites, lower plasmatic antioxidant capacity, and shorter telomere lengths; however the low sample size restrict any strong conclusions. Nevertheless, our data suggests that nonlinear relationships with a threshold may exist between accumulated contaminant concentrations and physiological status of the birds. These findings were used to build a hypothesis to be applied in future modelling for describing how chronic exposure to contaminants may be linked to telomere dynamics.
اظهر المزيد [+] اقل [-]Comparison in the response of three European Gammarid species exposed to the growth regulator insecticide fenoxycarb النص الكامل
2019
Arambourou, Hélène | Vulliet, Emmanuelle | Danièle, Gaëlle | Noury, Patrice | Delorme, Nicolas | Abbaci, Khedidja | Forcellini, Maxence | Tutundjian, Renaud | Barata, Carlos | RiverLy (UR Riverly) ; Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA) | ISA-TRACES - Technologie et Recherche en Analyse Chimique pour l'Environnement et la Santé ; Institut des Sciences Analytiques (ISA) ; Université Claude Bernard Lyon 1 (UCBL) ; Université de Lyon-Université de Lyon-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL) ; Université de Lyon-Université de Lyon-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS) | Institute of Environmental Assessment and Water Research (IDAEA) ; Consejo Superior de Investigaciones Cientificas = Spanish National Research Council (CSIC) | French Ec2co program
[Departement_IRSTEA]Eaux [TR1_IRSTEA]QUASARE [ADD1_IRSTEA]Systèmes aquatiques soumis à des pressions multiples | International audience | Growth regulator insecticides with juvenoid activity can affect the development and reproduction of non-target organisms such as crustaceans. In this perspective, our previous studies revealed deleterious effects of the juvenoid fenoxycarb at 5 µg L
اظهر المزيد [+] اقل [-]Does water temperature influence the distribution and elimination of perfluorinated substances in rainbow trout (Oncorhynchus mykiss)? النص الكامل
2019
Vidal, Alice | Lafay, Florent | Danièle, Gaëlle | Vulliet, Emmanuelle | Rochard, Eric | Garric, Jeanne | Babut, Marc | RiverLy (UR Riverly) ; Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA) | ISA-TRACES - Technologie et Recherche en Analyse Chimique pour l'Environnement et la Santé ; Institut des Sciences Analytiques (ISA) ; Université Claude Bernard Lyon 1 (UCBL) ; Université de Lyon-Université de Lyon-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL) ; Université de Lyon-Université de Lyon-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS) | Ecosystèmes aquatiques et changements globaux (UR EABX) ; Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)
[Departement_IRSTEA]Eaux [TR1_IRSTEA]BELCA [ADD1_IRSTEA]Systèmes aquatiques soumis à des pressions multiples | International audience | Perfluorinated and polyfluorinated substances (PFASs) are widely found in freshwater ecosystems because of their resistance to degradation and their ability to accumulate in aquatic organisms. While water temperature controls many physiological processes in fish, knowledge of the effects of this factor on PFAS toxicokinetic is still limited. This study presents experimental results of internal distribution and elimination rates of two perfluorinated acid compounds, namely perfluorooctane sulfonate (PFOS) and perfluorohexane sulfonate (PFHxS) in adult rainbow trout (Oncorhynchus mykiss) exposed to three temperatures. Dietary exposure experiments were conducted at 7 °C, 11 °C, and 19 °C and liver, blood, muscle, brain, and kidney were sampled for analysis. PFOS concentrations were comparable to or exceeded those of PFHxS, while PFHxS was eliminated faster than PFOS, whatever the temperature. Internal distribution changed significantly for both substances when fish were exposed to a range of temperatures from 7 to 19 °C. Indeed, PFOS and PFHxS relative distribution increased in blood, liver, and brain while they decreased in muscle when the water temperature rose. The water temperature variation affected the elimination half-lives, depending on the substances and organs.
اظهر المزيد [+] اقل [-]Comparison in the response of three European Gammarid species exposed to the growth regulator insecticide fenoxycarb النص الكامل
2019
Arambourou, Hélène | Vulliet, Emmanuelle | Danièle, Gaëlle | Noury, Patrice | Delorme, Nicolas | Abbaci, Khedidja | Forcellini, Maxence | Tutundjian, Renaud | Barata, Carlos | RiverLy - Fonctionnement des hydrosystèmes ; Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA) | ISA-TRACES - Technologie et Recherche en Analyse Chimique pour l'Environnement et la Santé ; Institut des Sciences Analytiques (ISA) ; Université Claude Bernard Lyon 1 (UCBL) ; Université de Lyon-Université de Lyon-Institut de Chimie - CNRS Chimie (INC-CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL) ; Université de Lyon-Université de Lyon-Institut de Chimie - CNRS Chimie (INC-CNRS)-Centre National de la Recherche Scientifique (CNRS) | Institute of Environmental Assessment and Water Research (IDAEA) ; Consejo Superior de Investigaciones Cientificas [España] = Spanish National Research Council [Spain] (CSIC) | French Ec2co program
Comparison in the response of three European Gammarid species exposed to the growth regulator insecticide fenoxycarb النص الكامل
2019
Arambourou, Hélène | Vulliet, Emmanuelle | Danièle, Gaëlle | Noury, Patrice | Delorme, Nicolas | Abbaci, Khedidja | Forcellini, Maxence | Tutundjian, Renaud | Barata, Carlos | RiverLy - Fonctionnement des hydrosystèmes ; Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA) | ISA-TRACES - Technologie et Recherche en Analyse Chimique pour l'Environnement et la Santé ; Institut des Sciences Analytiques (ISA) ; Université Claude Bernard Lyon 1 (UCBL) ; Université de Lyon-Université de Lyon-Institut de Chimie - CNRS Chimie (INC-CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL) ; Université de Lyon-Université de Lyon-Institut de Chimie - CNRS Chimie (INC-CNRS)-Centre National de la Recherche Scientifique (CNRS) | Institute of Environmental Assessment and Water Research (IDAEA) ; Consejo Superior de Investigaciones Cientificas [España] = Spanish National Research Council [Spain] (CSIC) | French Ec2co program
[Departement_IRSTEA]Eaux [TR1_IRSTEA]QUASARE [ADD1_IRSTEA]Systèmes aquatiques soumis à des pressions multiples | International audience | Growth regulator insecticides with juvenoid activity can affect the development and reproduction of non-target organisms such as crustaceans. In this perspective, our previous studies revealed deleterious effects of the juvenoid fenoxycarb at 5 µg L
اظهر المزيد [+] اقل [-]Comparison in the response of three European Gammarid species exposed to the growth regulator insecticide fenoxycarb | Comparison of the response to growth regulator insecticide fenoxycarb exposure in three European Gammaridae species النص الكامل
2019
Arambourou, Hélène | Vulliet, Emmanuelle | Daniele, Gaëlle | Noury, Patrice | Delorme, Nicolas | Abbaci, Khédidja Tair | Forcellini, Maxence | Tutundjian, Renaud | Barata Martí, Carlos | Barata Martí, Carlos [0000-0002-3360-0729]
Growth regulator insecticides with juvenoid activity can affect the development and reproduction of non-target organisms such as crustaceans. In this perspective, our previous studies revealed deleterious effects of the juvenoid fenoxycarb at 5 μg L −1 on the embryogenesis and at 50 μg L −1 on the reproductive behavior of the amphipod Gammarus fossarum. In the present study, to determine whether data generated with one amphipod species can be extended to other gammarid species, we tested the effects of a 5 μg L −1 fenoxycarb exposure on three European amphipod species: G. fossarum, Gammarus roeseli, and Echinogammarus longisetosus. We exposed individually 60 freshly fertilized females to fenoxycarb throughout the entire oogenesis/embryogenesis cycle (i.e., 19 days). In newborn individuals from exposed embryos, we measured both pigmentation and lipid reserve impairments while in exposed females, we observed reproductive behavior. At 5 μg L −1 fenoxycarb, reproductive behavior was only altered in G. fossarum. This study demonstrates the variability of the toxic response among the three gammaridae species, underlining the need for acquiring data with a broad phylogenetic representation to better predict toxic effects on freshwater ecosystems. © 2019, Springer-Verlag GmbH Germany, part of Springer Nature. | This research was financially supported by the French Ec2co program. | Peer reviewed
اظهر المزيد [+] اقل [-]Intermittent flux from a sand filter for household wastewater and integrated solute transfer to the vadose zone النص الكامل
2019
Nasri, Behzad | Fouché, Olivier | Laboratoire Géomatique et foncier (GeF) ; Conservatoire National des Arts et Métiers [Cnam] (Cnam) | Institut d'écologie et des sciences de l'environnement de Paris (iEES Paris) ; Institut de Recherche pour le Développement (IRD)-Sorbonne Université (SU)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) | Laboratoire Eau Environnement et Systèmes Urbains (LEESU) ; École nationale des ponts et chaussées (ENPC)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)
Intermittent flux from a sand filter for household wastewater and integrated solute transfer to the vadose zone النص الكامل
2019
Nasri, Behzad | Fouché, Olivier | Laboratoire Géomatique et foncier (GeF) ; Conservatoire National des Arts et Métiers [Cnam] (Cnam) | Institut d'écologie et des sciences de l'environnement de Paris (iEES Paris) ; Institut de Recherche pour le Développement (IRD)-Sorbonne Université (SU)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) | Laboratoire Eau Environnement et Systèmes Urbains (LEESU) ; École nationale des ponts et chaussées (ENPC)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)
International audience
اظهر المزيد [+] اقل [-]Intermittent flux from a sand filter for household wastewater and integrated solute transfer to the vadose zone النص الكامل
2019
Nasri, Behzad | Fouché, Olivier
Depending on the actual number of soil-based on-site wastewater treatment system (OWTS) in an area, on-site sanitation may be a significant source of pollutants and a threat to groundwater. Even in the case of a system functioning correctly, here, a sand filter substituted for the in-situ soil, as the treated effluent may reach to the water table, it is necessary evaluating in situ how much the sand and underneath soil respectively contribute to pollutant removal. On the plot of a household in a small rural community, the functioning of a real scale OWTS was monitored for 1.5 years. This system, composed of a septic tank connected to a 5 × 5 m² and 0.7-m thick aerobic sand filter was equipped with soil hydrodynamic probes (water content and matrix potential) during construction. By using the instantaneous profile method of water content, the intermittent infiltrated flux was determined across the sand-pack according to position and time. Treated water infiltrates into underneath soil acting as post-treatment. Quality of interstitial liquid from the sand and the soil was analysed each month on a 12-h pumping sample obtained through porous plates. Results of water fluxes and concentrations provide an estimate of the annual flux to the vadose zone and groundwater of metals, nutrients and some organic micro-pollutants (parabens and triclosan) through the OWTS and subsoil.
اظهر المزيد [+] اقل [-]Assessment of the metal contamination evolution in the Loire estuary using Cu and Zn stable isotopes and geochemical data in sediments النص الكامل
2019
Ferreira Araujo, Daniel | Ponzevera, Emmanuel | Briant, Nicolas | Knoery, Joel | Sireau, Teddy | Mojtahid, Meryem | Metzger, Edouard | Brach-papa, Christophe
Assessment of the metal contamination evolution in the Loire estuary using Cu and Zn stable isotopes and geochemical data in sediments النص الكامل
2019
Ferreira Araujo, Daniel | Ponzevera, Emmanuel | Briant, Nicolas | Knoery, Joel | Sireau, Teddy | Mojtahid, Meryem | Metzger, Edouard | Brach-papa, Christophe
In this work, a multi-elemental approach combining Cu and Zn stable isotopes is used to assess the metal contamination evolution in the Loire estuary bulk sediments. Elemental geochemical data indicate an increase of metal concentrations from the beginning of the industrial period peaking in the 1990s, followed by an attenuation of metal contamination inputs to the estuary. Zinc isotope compositions suggest a binary mixing process between Zn derived from terrigenous material and multi-urban anthropogenic sources. Copper isotope systematics indicate a single natural dominant source represented by weathered silicate particles from soils and rocks. This work demonstrates the applicability of Zn isotopes to identify anthropogenic Zn sources in coastal systems, even under a low to moderate degree of contamination. Further studies are required to constrain Cu sources and to elucidate possible effects of grain-size and mineralogy in the Cu isotope composition of sediment in the Loire estuary.
اظهر المزيد [+] اقل [-]Assessment of the metal contamination evolution in the Loire estuary using Cu and Zn stable isotopes and geochemical data in sediments النص الكامل
2019
Araújo, Daniel F. | Ponzevera, Emmanuel | Briant, Nicolas | Knoery, Joël | Sireau, Teddy | Mojtahid, Meryem | Metzger, Edouard | Brach-Papa, Christophe
In this work, a multi-elemental approach combining Cu and Zn stable isotopes is used to assess the metal contamination evolution in the Loire estuary bulk sediments. Elemental geochemical data indicate an increase of metal concentrations from the beginning of the industrial period peaking in the 1990s, followed by an attenuation of metal contamination inputs to the estuary. Zinc isotope compositions suggest a binary mixing process between Zn derived from terrigenous material and multi-urban anthropogenic sources. Copper isotope systematics indicate a single natural dominant source represented by weathered silicate particles from soils and rocks. This work demonstrates the applicability of Zn isotopes to identify anthropogenic Zn sources in coastal systems, even under a low to moderate degree of contamination. Further studies are required to constrain Cu sources and to elucidate possible effects of grain-size and mineralogy in the Cu isotope composition of sediment in the Loire estuary.
اظهر المزيد [+] اقل [-]Seafloor litter from the continental shelf and canyons in French Mediterranean Water: Distribution, typologies and trends النص الكامل
2019
Gerigny, Olivia | Brun, Melanie | Fabri, Marie-claire | Tomasino, Corinne | Le Moigne, Morgan | Jadaud, Angelique | Galgani, Francois
Seafloor litter from the continental shelf and canyons in French Mediterranean Water: Distribution, typologies and trends النص الكامل
2019
Gerigny, Olivia | Brun, Melanie | Fabri, Marie-claire | Tomasino, Corinne | Le Moigne, Morgan | Jadaud, Angelique | Galgani, Francois
Seafloor litter has been studied both on the continental shelves (by trawling during 24 years) and in canyons (by ROV) of the French Mediterranean sea Water (FMW). On the continental shelf, mean densities range from 49.63 to 289.01 items/km2. The most abundant categories were plastic, glass/ceramics, metals and textiles. Trend analysis shows a significant increase in plastic quantities during the study period. Plastics accumulate at all depths, with heavier items being found in deeper areas, while the continental slope-break appears as a clean area. The spatial distribution of litter revealed the influence of geomorphologic factors, anthropic activities, shipping route, river inputs. All the canyons are affected by debris but coastal canyons (Ligurian Sea and Corsica) were more impacted than offshore canyons in the Gulf of Lion. The FMW appears to be highly polluted with regard to values found in other areas, but lower than those observed in the Eastern Mediterranean.
اظهر المزيد [+] اقل [-]Seafloor litter from the continental shelf and canyons in French Mediterranean Water: Distribution, typologies and trends النص الكامل
2019
Gerigny, O. | Brun, M. | Fabri, M.C. | Tomasino, C. | Le Moigne, M. | Jadaud, A. | Galgani, F.
Seafloor litter has been studied both on the continental shelves (by trawling during 24 years) and in canyons (by ROV) of the French Mediterranean sea Water (FMW). On the continental shelf, mean densities range from 49.63 to 289.01 items/km². The most abundant categories were plastic, glass/ceramics, metals and textiles. Trend analysis shows a significant increase in plastic quantities during the study period. Plastics accumulate at all depths, with heavier items being found in deeper areas, while the continental slope-break appears as a clean area. The spatial distribution of litter revealed the influence of geomorphologic factors, anthropic activities, shipping route, river inputs. All the canyons are affected by debris but coastal canyons (Ligurian Sea and Corsica) were more impacted than offshore canyons in the Gulf of Lion. The FMW appears to be highly polluted with regard to values found in other areas, but lower than those observed in the Eastern Mediterranean.
اظهر المزيد [+] اقل [-]Changes in mobility of trace metals at the sediment-water-biota interfaces following laboratory drying and reimmersion of a lacustrine sediment النص الكامل
2019
Lécrivain, Nathalie | Frossard, Victor | Clement, Bernard | Laboratoire d'Ecologie des Hydrosystèmes Naturels et Anthropisés (LEHNA) ; Université Claude Bernard Lyon 1 (UCBL) ; Université de Lyon-Université de Lyon-École Nationale des Travaux Publics de l'État (ENTPE)-Centre National de la Recherche Scientifique (CNRS) | Centre Alpin de Recherche sur les Réseaux Trophiques et Ecosystèmes Limniques (CARRTEL) ; Institut National de la Recherche Agronomique (INRA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])
International audience
اظهر المزيد [+] اقل [-]