Influence of Aveiro Lagoon heavy metal contents in the adjacent continental shelf (Portugal)

Influence of Aveiro Lagoon heavy metal contents in the adjacent continental shelf (Portugal)

A chemical analysis of Al, Ca, Fe, Mg, Cu, Pb, Zn, Cr, Co, Ni and Cd was carried out in 22 surface sediment samples of the continental shelf and upper slope between Espinho and Aveiro (Portugal). To reduce the disturbing effects of grain size, all samples were size-normalized by wet sieving (&lt...

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Autores principales: Abrantes, I, Rocha, F, Vidinha, J, Dias, JA
格式: Online
语言:eng
出版: Iniversidad Autónoma de Baja California 2005
在线阅读:https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/99
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spelling oai:cienciasmarinas.com.mx:article-992019-04-25T19:17:49Z Influence of Aveiro Lagoon heavy metal contents in the adjacent continental shelf (Portugal) Influencia de la Laguna de Aveiro en los contenidos de metales pesados en la plataforma continental adyacente (Portugal) Abrantes, I Rocha, F Vidinha, J Dias, JA heavy metals sediments continental shelf Aveiro Lagoon multivariate statistical analysis metales pesados sedimentos plataforma continental Laguna de Aveiro análisis estadístico multivariante A chemical analysis of Al, Ca, Fe, Mg, Cu, Pb, Zn, Cr, Co, Ni and Cd was carried out in 22 surface sediment samples of the continental shelf and upper slope between Espinho and Aveiro (Portugal). To reduce the disturbing effects of grain size, all samples were size-normalized by wet sieving (<63 µm). The fine fraction was digested with concentrated acids and analyzed by flame atomic absorption spectrometry. The Al and heavy metal concentrations displayed a similar distribution pattern, decreasing seaward. Exceptions to this general pattern are Ca, Mg and Pb distributions. The Ca contents are related to carbonated biogenic particles that are very abundant in the outer shelf. Multivariate statistical analysis was applied to all data to assess the behaviour and sources of each element analyzed. The results from factor analysis showed that terrigenous supply (from Aveiro Lagoon flow, coastal erosion and littoral drift), grain size (clay) sorting and anthropogenic influences from Aveiro Lagoon are the major factors controlling spatial variations of chemical elements in the continental shelf between Espinho and Aveiro. Unusually high contents of Pb were found in the middle shelf off Furadouro, but we could not determine the possible source of this contamination. Se realizaron análisis químicos de Al, Ca, Fe, Mg, Pb, Zn, Cr, Co, Ni y Cd en 22 muestras de sedimento superficial de la plataforma y vertiente continental entre Espinho y Aveiro (Portugal). Para reducir el efecto de la granulometría del sedimento, se normalizó el tamaño de las muestras mediante tamizado (<63 µm). Se procedió a la digestión de la fracción fina con ácidos concentrados y se analizó mediante espectrometría de absorción atómica con llama. Las concentraciones de Al y metales pesados muestran un patrón de distribución similar, disminuyendo hacia la vertiente. Las excepciones a este patrón general son las distribuciones de Ca, Mg y Pb. El contenido de Ca está relacionado con las partículas biogénicas carbonatadas que son muy abundantes en la plataforma externa. Con el objetivo de determinar el comportamiento y el origen de cada uno de los elementos analizados, se aplicaron técnicas de análisis estadístico multivariante. Los resultados obtenidos muestran que los principales factores que controlan las variaciones espaciales de los elementos químicos en la plataforma continental entre Espinho y Aveiro son los sedimentos terrígenos procedentes de la Laguna de Aveiro, de la erosión costera y de la deriva litoral; el tamaño de grano (tamaño arcillas); y la influencia antropogénica en la Laguna de Aveiro. En la plataforma media, a la altura de Furadouro, se encontraron valores elevados de Pb, aunque no hemos podido determinar la posible fuente de esta contaminación. Iniversidad Autónoma de Baja California 2005-03-06 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article Artículo Arbitrado application/pdf https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/99 10.7773/cm.v31i12.99 Ciencias Marinas; Vol. 31 No. 1B (2005); 149-160 Ciencias Marinas; Vol. 31 Núm. 1B (2005); 149-160 2395-9053 0185-3880 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/99/79
institution Ciencias Marinas
collection OJS
language eng
format Online
author Abrantes, I
Rocha, F
Vidinha, J
Dias, JA
spellingShingle Abrantes, I
Rocha, F
Vidinha, J
Dias, JA
Influence of Aveiro Lagoon heavy metal contents in the adjacent continental shelf (Portugal)
author_facet Abrantes, I
Rocha, F
Vidinha, J
Dias, JA
author_sort Abrantes, I
title Influence of Aveiro Lagoon heavy metal contents in the adjacent continental shelf (Portugal)
title_short Influence of Aveiro Lagoon heavy metal contents in the adjacent continental shelf (Portugal)
title_full Influence of Aveiro Lagoon heavy metal contents in the adjacent continental shelf (Portugal)
title_fullStr Influence of Aveiro Lagoon heavy metal contents in the adjacent continental shelf (Portugal)
title_full_unstemmed Influence of Aveiro Lagoon heavy metal contents in the adjacent continental shelf (Portugal)
title_sort influence of aveiro lagoon heavy metal contents in the adjacent continental shelf (portugal)
description A chemical analysis of Al, Ca, Fe, Mg, Cu, Pb, Zn, Cr, Co, Ni and Cd was carried out in 22 surface sediment samples of the continental shelf and upper slope between Espinho and Aveiro (Portugal). To reduce the disturbing effects of grain size, all samples were size-normalized by wet sieving (<63 µm). The fine fraction was digested with concentrated acids and analyzed by flame atomic absorption spectrometry. The Al and heavy metal concentrations displayed a similar distribution pattern, decreasing seaward. Exceptions to this general pattern are Ca, Mg and Pb distributions. The Ca contents are related to carbonated biogenic particles that are very abundant in the outer shelf. Multivariate statistical analysis was applied to all data to assess the behaviour and sources of each element analyzed. The results from factor analysis showed that terrigenous supply (from Aveiro Lagoon flow, coastal erosion and littoral drift), grain size (clay) sorting and anthropogenic influences from Aveiro Lagoon are the major factors controlling spatial variations of chemical elements in the continental shelf between Espinho and Aveiro. Unusually high contents of Pb were found in the middle shelf off Furadouro, but we could not determine the possible source of this contamination.
publisher Iniversidad Autónoma de Baja California
publishDate 2005
url https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/99
_version_ 1715723934399201280

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