Dating of marine sediments and time evolution of heavy metal concentrations in the Bay of Cádiz, Spain
| Autor: | F López-Aguayo, Diego Sales, M. Barrera, R.A. Ligero, M. Casas-Ruiz |
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| Rok vydání: | 2002 |
| Předmět: |
Pollution
Geologic Sediments Time Factors Health Toxicology and Mutagenesis media_common.quotation_subject Toxicology Isotopes Metals Heavy Cesium Isotopes Industry Water Pollutants Seabed media_common Retrospective Studies Radionuclide Aquatic ecosystem Sediment General Medicine Oceanography Lead Spain Sedimentary rock Radiometric dating Bay Geology Environmental Monitoring |
| Zdroj: | Environmental pollution (Barking, Essex : 1987). 118(1) |
| ISSN: | 0269-7491 |
| Popis: | In this paper the time evolution of heavy metal concentration of Pb, Zn, Cd and Hg, in the sediments of the Bay of Cadiz (southwest of Spain) is studied during the past century, as a result of the industrial influence in the zone. The study has been performed using sedimentary profiles that have been extracted from the seabed. The measurement of 210Pb and 137Cs radionuclides has provided the dating of the sediment layers, up to a depth corresponding to the age of 115 years. The relative sedimentation rates obtained are around 0.2 cm/year. The 137Cs activity profile reflects the concentration of this radionuclide in the atmosphere and into aquatic systems during the second half of the twentieth century. This profile has been used to ratify the results provided by the 210Pb dating method. |
| Databáze: | OpenAIRE |
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