Linked Life Data

16701790

Source:http://linkedlifedata.com/resource/pubmed/id/16701790

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
2006-7-24
pubmed:abstractText
Although high energy shelves are usually ignored in environmental studies, the fine fractions of sandy deposits and the restricted areas of silty clayey deposits record contaminant loading history and can represent important components for understanding processes and fluxes in a system perspective. The main aim of this work is identify trends in historical pollution in three accumulation areas of the western Portuguese shelf that are characterised by different oceanographic and sedimentologic conditions. The vertical distribution of major (Al, Ca, Fe, Mg, Mn and S) and trace elements (Cr, Cu, Li, Ni, Pb, Sc, Sr and Zn), (210)Pb and the fine fraction contents, are documented. The (210)Pb distributions with depth confirm recent accumulation in the study areas and provide a chronologic basis. Factor analysis is used to classify the number of variables into detrital, biogenic and anthropogenic factors that may reflect common metal sources or sedimentary processes. Related to both bioturbation and hydrodynamic processes occurring at water-depths greater than 100 m, the northern Ave-Douro area has a 5-7 cm mixed-layer at the surface affecting the deposition signal. In the Lis area, on the central shelf, heavy metal contents normalised to aluminium indicate slight anthropogenic enrichment in Pb and Zn contents since the beginning of the 20th century and higher levels from the 1950s until the present. These historical trends can reflect changes in the industrial activity and in the combustion of leaded gasoline. Down-core profiles from the southern Mira area reveal metal enrichments that may be caused by early diagenetic remobilisation and precipitation. The use of dated profiles extending across the record of industrial development allows both enrichment factors and excess (anthropogenic) metal fluxes to be compared with historical changes.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Aug
pubmed:issn
0048-9697
pubmed:author
pubmed:issnType
Print
pubmed:day
15
pubmed:volume
367
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
466-80
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
2006
pubmed:articleTitle
Pollution history of heavy metals on the Portuguese shelf using 210Pb-geochronology.
pubmed:affiliation
Departamento de Geologia Marinha, Instituto Nacional de Engenharia, Tecnologia e Inovação, Estrada da Portela, Apartado 7586, 2721-866 Alfragide, Portugal. mario.milhomens@ineti.pt
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't