Trace metal distribution in muddy-patch sediments from the northern Portuguese Shelf
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Redalyc · Ciencias Marinas
Three sediment cores were collected in the muddy patches of the northern Portuguese Shelf located offshore the Douro and Minho rivers. Bivalves and worms were found in the upper and sub-surface layers of two cores. Vertical distributions of dissolved manganese and iron, iron oxides and acid volatile...
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| Format: | Artículo científico |
| Language: | en |
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Universidad Autónoma de Baja California
2003
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| _version_ | 1878325298403999744 |
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| author | Maria João Madureira |
| author_facet | Maria João Madureira |
| collection | Ciencias Marinas |
| container_title | Ciencias Marinas |
| contents | Trace metal distribution in muddy-patch sediments from the northern Portuguese Shelf Maria João Madureira Nuno Fonseca Carlos Vale Ciencias de la Tierra sulphides trace metals early diagenesis northern Portuguese Shelf Three sediment cores were collected in the muddy patches of the northern Portuguese Shelf located offshore the Douro andMinho rivers. Bivalves and worms were found in the upper and sub-surface layers of two cores. Vertical distributions of dissolvedmanganese and iron, iron oxides and acid volatile sulphide (AVS) in the bioturbated cores differ dramatically from those in thecore where macrofauna was not observed. Also, Fe, Zn, Cu, Pb and Cd simultaneously extracted with AVS (1 M HCl) showedpronounced increases in concentrations deeper in the sediments. Where bioturbation was not visible the profiles of extractableCu, Pb and Cd are consistent with the precipitation of downward diffusing dissolved metals. However, this redistribution did notaffect the metal-total vertical profiles. Reactive metals exhibited multiple peaks in the irrigated sub-surface layers where AVS anddissolved Fe showed successive maxima and minima with the depth. We interpreted these profiles as the net result of dissolvedoxygen being pumped into the sediment and the formation of several oxic/anoxic interfaces. At these depths trace metals aremobilized in the oxidized layers, diffused a few millimetres towards the layers where sulphide is present, and precipitated. Theconsequence of this internal redistribution was the broad maxima of total metal concentrations in irrigated sediment depths. 2003 artículo científico 0185-3880 https://www.redalyc.org/articulo.oa?id=48029407 en http://www.redalyc.org/revista.oa?id=480 Ciencias Marinas application/pdf Universidad Autónoma de Baja California Ciencias Marinas (México) Num.4 Vol.29 |
| ctrlnum | oai:cienciasmarinas.com.mx:article/172 10.7773/cm.v29i4.172 |
| description | Three sediment cores were collected in the muddy patches of the northern Portuguese Shelf located offshore the Douro and Minho rivers. Bivalves and worms were found in the upper and sub-surface layers of two cores. Vertical distributions of dissolved manganese and iron, iron oxides and acid volatile sulphide (AVS) in the bioturbated cores differ dramatically from those in the core where macrofauna was not observed. Also, Fe, Zn, Cu, Pb and Cd simultaneously extracted with AVS (1 M HCl) showed pronounced increases in concentrations deeper in the sediments. Where bioturbation was not visible the profiles of extractable Cu, Pb and Cd are consistent with the precipitation of downward diffusing dissolved metals. However, this redistribution did not affect the metal-total vertical profiles. Reactive metals exhibited multiple peaks in the irrigated sub-surface layers where AVS and dissolved Fe showed successive maxima and minima with the depth. We interpreted these profiles as the net result of dissolved oxygen being pumped into the sediment and the formation of several oxic/anoxic interfaces. At these depths trace metals are mobilized in the oxidized layers, diffused a few millimetres towards the layers where sulphide is present, and precipitated. The consequence of this internal redistribution was the broad maxima of total metal concentrations in irrigated sediment depths.
Se muestrearon tres testigos de sedimento en manchas de lodo procedentes de la plataforma continental del norte de Portugal localizadas frente a los ríos Duero y Miño. En las capas superficial y subsuperficial de dos de los testigos se encontraron bibalvos y gusanos. Las distribuciones verticales de hierro y manganeso disueltos, óxidos de hierro y sulfuros volátiles ácidos (AVS) en los testigos bioperturbados son drásticamente diferentes de aquellos en los que no se observó macrofauna alguna. De igual forma, el Fe, Zn, Cu, Pb y Cd extraídos simultáneamente con los AVS (HCl 1M), mostraron incrementos marcados en la concentración en zonas más profundas del sedimento. Donde la bioperturbación no fue visible, los perfiles de Cu, Pb y Cd extraíbles concuerdan con la precipitación y los metales disueltos con difusión descendente. Sin embargo, esta redistribución no afectó los perfiles verticales de metales totales. Los metales reactivos mostraron picos múltiples en capas irrigadas sub-superficiales donde los AVS y el Fe disuelto presentaron máximos y mínimos sucesivos con la profundidad. Interpretamos estos perfiles como el resultado neto del bombeo de oxígeno disuelto hacia el sedimento y la formación de varias interfases óxicas-anóxicas. En estas profundidades, los metales traza son movilizados en las capas oxidadas, y difundidos unos pocos milímetros hacia las capas donde hay sulfuro y éste precipita. La consecuencia de esta redistribución interna determina el máximo de las concentraciones totales de metales en profundidades con sedimentos irrigados. |
| format | Artículo científico |
| id | redalyc_48029407 |
| institution | Redalyc Ciencias Marinas |
| language | en |
| publishDate | 2003 |
| publisher | Universidad Autónoma de Baja California |
| spelling | Trace metal distribution in muddy-patch sediments from the northern Portuguese Shelf Distribución de metales traza en sedimentos de zonas de lodo de la plataforma costera norte de Portugal Madureira, MJ Vale, C Fonseca, N trace metals sulphides early diagenesis northern Portuguese Shelf metales traza sulfuros diagenesis temprana plataforma norte de Portugal Three sediment cores were collected in the muddy patches of the northern Portuguese Shelf located offshore the Douro and Minho rivers. Bivalves and worms were found in the upper and sub-surface layers of two cores. Vertical distributions of dissolved manganese and iron, iron oxides and acid volatile sulphide (AVS) in the bioturbated cores differ dramatically from those in the core where macrofauna was not observed. Also, Fe, Zn, Cu, Pb and Cd simultaneously extracted with AVS (1 M HCl) showed pronounced increases in concentrations deeper in the sediments. Where bioturbation was not visible the profiles of extractable Cu, Pb and Cd are consistent with the precipitation of downward diffusing dissolved metals. However, this redistribution did not affect the metal-total vertical profiles. Reactive metals exhibited multiple peaks in the irrigated sub-surface layers where AVS and dissolved Fe showed successive maxima and minima with the depth. We interpreted these profiles as the net result of dissolved oxygen being pumped into the sediment and the formation of several oxic/anoxic interfaces. At these depths trace metals are mobilized in the oxidized layers, diffused a few millimetres towards the layers where sulphide is present, and precipitated. The consequence of this internal redistribution was the broad maxima of total metal concentrations in irrigated sediment depths. Se muestrearon tres testigos de sedimento en manchas de lodo procedentes de la plataforma continental del norte de Portugal localizadas frente a los ríos Duero y Miño. En las capas superficial y subsuperficial de dos de los testigos se encontraron bibalvos y gusanos. Las distribuciones verticales de hierro y manganeso disueltos, óxidos de hierro y sulfuros volátiles ácidos (AVS) en los testigos bioperturbados son drásticamente diferentes de aquellos en los que no se observó macrofauna alguna. De igual forma, el Fe, Zn, Cu, Pb y Cd extraídos simultáneamente con los AVS (HCl 1M), mostraron incrementos marcados en la concentración en zonas más profundas del sedimento. Donde la bioperturbación no fue visible, los perfiles de Cu, Pb y Cd extraíbles concuerdan con la precipitación y los metales disueltos con difusión descendente. Sin embargo, esta redistribución no afectó los perfiles verticales de metales totales. Los metales reactivos mostraron picos múltiples en capas irrigadas sub-superficiales donde los AVS y el Fe disuelto presentaron máximos y mínimos sucesivos con la profundidad. Interpretamos estos perfiles como el resultado neto del bombeo de oxígeno disuelto hacia el sedimento y la formación de varias interfases óxicas-anóxicas. En estas profundidades, los metales traza son movilizados en las capas oxidadas, y difundidos unos pocos milímetros hacia las capas donde hay sulfuro y éste precipita. La consecuencia de esta redistribución interna determina el máximo de las concentraciones totales de metales en profundidades con sedimentos irrigados. Universidad Autónoma de Baja California, Instituto de Investigaciones Oceanológicas 2003-03-06 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article Artículo Arbitrado application/pdf https://cienciasmarinas.com.mx/index.php/cmarinas/article/view/172 10.7773/cm.v29i4.172 Ciencias Marinas; Vol. 29 No. 4 (2003); 435-445 Ciencias Marinas; Vol. 29 Núm. 4 (2003); 435-445 2395-9053 0185-3880 eng https://cienciasmarinas.com.mx/index.php/cmarinas/article/view/172/147 ['Redalyc'] redalyc_48029407 Trace metal distribution in muddy-patch sediments from the northern Portuguese Shelf ['Trace metal distribution in muddy-patch sediments from the northern Portuguese Shelf', 'Maria João Madureira', 'Ciencias de la Tierra', 'sulphides', 'trace metals', 'early diagenesis', 'northern Portuguese Shelf', 'Trace metal distribution in muddy-patch sediments from the northern Portuguese Shelf Maria João Madureira Nuno Fonseca Carlos Vale Ciencias de la Tierra sulphides trace metals early diagenesis northern Portuguese Shelf Three sediment cores were collected in the muddy patches of the northern Portuguese Shelf located offshore the Douro andMinho rivers. Bivalves and worms were found in the upper and sub-surface layers of two cores. Vertical distributions of dissolvedmanganese and iron, iron oxides and acid volatile sulphide (AVS) in the bioturbated cores differ dramatically from those in thecore where macrofauna was not observed. Also, Fe, Zn, Cu, Pb and Cd simultaneously extracted with AVS (1 M HCl) showedpronounced increases in concentrations deeper in the sediments. Where bioturbation was not visible the profiles of extractableCu, Pb and Cd are consistent with the precipitation of downward diffusing dissolved metals. However, this redistribution did notaffect the metal-total vertical profiles. Reactive metals exhibited multiple peaks in the irrigated sub-surface layers where AVS anddissolved Fe showed successive maxima and minima with the depth. We interpreted these profiles as the net result of dissolvedoxygen being pumped into the sediment and the formation of several oxic/anoxic interfaces. At these depths trace metals aremobilized in the oxidized layers, diffused a few millimetres towards the layers where sulphide is present, and precipitated. Theconsequence of this internal redistribution was the broad maxima of total metal concentrations in irrigated sediment depths. 2003 artículo científico 0185-3880 https://www.redalyc.org/articulo.oa?id=48029407 en http://www.redalyc.org/revista.oa?id=480 Ciencias Marinas application/pdf Universidad Autónoma de Baja California Ciencias Marinas (México) Num.4 Vol.29'] ['Maria João Madureira'] ['Maria João Madureira'] ['Artículo científico'] ['2003'] ['Universidad Autónoma de Baja California'] ['en'] ['Ciencias de la Tierra', 'sulphides', 'trace metals', 'early diagenesis', 'northern Portuguese Shelf'] ['https://www.redalyc.org/articulo.oa?id=48029407'] ['Trace metal distribution in muddy-patch sediments from the northern Portuguese Shelf Maria João Madureira Nuno Fonseca Carlos Vale Ciencias de la Tierra sulphides trace metals early diagenesis northern Portuguese Shelf Three sediment cores were collected in the muddy patches of the northern Portuguese Shelf located offshore the Douro andMinho rivers. Bivalves and worms were found in the upper and sub-surface layers of two cores. Vertical distributions of dissolvedmanganese and iron, iron oxides and acid volatile sulphide (AVS) in the bioturbated cores differ dramatically from those in thecore where macrofauna was not observed. Also, Fe, Zn, Cu, Pb and Cd simultaneously extracted with AVS (1 M HCl) showedpronounced increases in concentrations deeper in the sediments. Where bioturbation was not visible the profiles of extractableCu, Pb and Cd are consistent with the precipitation of downward diffusing dissolved metals. However, this redistribution did notaffect the metal-total vertical profiles. Reactive metals exhibited multiple peaks in the irrigated sub-surface layers where AVS anddissolved Fe showed successive maxima and minima with the depth. We interpreted these profiles as the net result of dissolvedoxygen being pumped into the sediment and the formation of several oxic/anoxic interfaces. At these depths trace metals aremobilized in the oxidized layers, diffused a few millimetres towards the layers where sulphide is present, and precipitated. Theconsequence of this internal redistribution was the broad maxima of total metal concentrations in irrigated sediment depths. 2003 artículo científico 0185-3880 https://www.redalyc.org/articulo.oa?id=48029407 en http://www.redalyc.org/revista.oa?id=480 Ciencias Marinas application/pdf Universidad Autónoma de Baja California Ciencias Marinas (México) Num.4 Vol.29'] |
| spellingShingle | Trace metal distribution in muddy-patch sediments from the northern Portuguese Shelf Maria João Madureira Ciencias de la Tierra sulphides trace metals early diagenesis northern Portuguese Shelf Trace metal distribution in muddy-patch sediments from the northern Portuguese Shelf Maria João Madureira Nuno Fonseca Carlos Vale Ciencias de la Tierra sulphides trace metals early diagenesis northern Portuguese Shelf Three sediment cores were collected in the muddy patches of the northern Portuguese Shelf located offshore the Douro andMinho rivers. Bivalves and worms were found in the upper and sub-surface layers of two cores. Vertical distributions of dissolvedmanganese and iron, iron oxides and acid volatile sulphide (AVS) in the bioturbated cores differ dramatically from those in thecore where macrofauna was not observed. Also, Fe, Zn, Cu, Pb and Cd simultaneously extracted with AVS (1 M HCl) showedpronounced increases in concentrations deeper in the sediments. Where bioturbation was not visible the profiles of extractableCu, Pb and Cd are consistent with the precipitation of downward diffusing dissolved metals. However, this redistribution did notaffect the metal-total vertical profiles. Reactive metals exhibited multiple peaks in the irrigated sub-surface layers where AVS anddissolved Fe showed successive maxima and minima with the depth. We interpreted these profiles as the net result of dissolvedoxygen being pumped into the sediment and the formation of several oxic/anoxic interfaces. At these depths trace metals aremobilized in the oxidized layers, diffused a few millimetres towards the layers where sulphide is present, and precipitated. Theconsequence of this internal redistribution was the broad maxima of total metal concentrations in irrigated sediment depths. 2003 artículo científico 0185-3880 https://www.redalyc.org/articulo.oa?id=48029407 en http://www.redalyc.org/revista.oa?id=480 Ciencias Marinas application/pdf Universidad Autónoma de Baja California Ciencias Marinas (México) Num.4 Vol.29 |
| title | Trace metal distribution in muddy-patch sediments from the northern Portuguese Shelf |
| title_alt | Distribución de metales traza en sedimentos de zonas de lodo de la plataforma costera norte de Portugal |
| topic | Ciencias de la Tierra sulphides trace metals early diagenesis northern Portuguese Shelf |
| topic_facet | trace metals sulphides early diagenesis northern Portuguese Shelf metales traza sulfuros diagenesis temprana plataforma norte de Portugal |
| url | https://www.redalyc.org/articulo.oa?id=48029407 https://cienciasmarinas.com.mx/index.php/cmarinas/article/view/172 |