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 (<63...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Universidad Autónoma de Baja California
2005-03-01
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| Series: | Ciencias Marinas |
| Subjects: | |
| Online Access: | https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/99 |
| _version_ | 1797279487182766080 |
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| author | I Abrantes F Rocha J Vidinha JA Dias |
| author_facet | I Abrantes F Rocha J Vidinha JA Dias |
| author_sort | I Abrantes |
| collection | DOAJ |
| 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.
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| first_indexed | 2024-03-07T16:26:03Z |
| format | Article |
| id | doaj.art-ca8ef0d4050944f1bf34c06c9039fd9b |
| institution | Directory Open Access Journal |
| issn | 0185-3880 2395-9053 |
| language | English |
| last_indexed | 2024-03-07T16:26:03Z |
| publishDate | 2005-03-01 |
| publisher | Universidad Autónoma de Baja California |
| record_format | Article |
| series | Ciencias Marinas |
| spelling | doaj.art-ca8ef0d4050944f1bf34c06c9039fd9b2024-03-03T18:32:39ZengUniversidad Autónoma de Baja CaliforniaCiencias Marinas0185-38802395-90532005-03-01311B10.7773/cm.v31i12.99Influence of Aveiro Lagoon heavy metal contents in the adjacent continental shelf (Portugal)I Abrantes0F Rocha1J Vidinha2JA Dias3ESE/Instituto Superior Politécnico de ViseuCentro de Minerais Industriais e ArgilasUniversidade do AlgarveUniversidade do Algarve 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. https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/99heavy metalssedimentscontinental shelfAveiro Lagoonmultivariate statistical analysis |
| spellingShingle | I Abrantes F Rocha J Vidinha JA Dias Influence of Aveiro Lagoon heavy metal contents in the adjacent continental shelf (Portugal) Ciencias Marinas heavy metals sediments continental shelf Aveiro Lagoon multivariate statistical analysis |
| title | 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_short | 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 |
| topic | heavy metals sediments continental shelf Aveiro Lagoon multivariate statistical analysis |
| url | https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/99 |
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