Combined SEM/AVS and attenuation of concentration models for the assessment of bioavailability and mobility of metals in sediments of Sepetiba Bay (SE Brazil)
| Autor: | Ana Maria Graciano Figueiredo, Rubens Cesar Lopes Figueira, Julio Cesar Wasserman, Emmanoel V. Silva Filho, Marycel Barboza Cotrim, José Osman dos Santos, Elizabeth Sonoda Keiko Dantas, Andreza Portella Ribeiro |
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| Rok vydání: | 2013 |
| Předmět: |
chemistry.chemical_classification
Geologic Sediments Sulfide Mineralogy Aquatic Science Contamination Oceanography Pollution Bioavailability Bays Models Chemical chemistry Metals Environmental chemistry Water Pollution Chemical Organic matter Mangrove Water pollution Bay Brazil Water Pollutants Chemical Environmental Monitoring |
| Zdroj: | Marine Pollution Bulletin. 68:55-63 |
| ISSN: | 0025-326X |
| Popis: | This study proposes a new methodology to study contamination, bioavailability and mobility of metals (Cd, Cu, Ni, Pb, and Zn) using chemical and geostatistics approaches in marine sediments of Sepetiba Bay (SE Brazil). The chemical model of SEM (simultaneously extracted metals)/AVS (acid volatile sulfides) ratio uses a technique of cold acid extraction of metals to evaluate their bioavailability, and the geostatistical model of attenuation of concentrations estimates the mobility of metals. By coupling the two it was observed that Sepetiba Port, the urban area of Sepetiba and the riverine discharges may constitute potential sources of metals to Sepetiba Bay. The metals are concentrated in the NE area of the bay, where they tend to have their lowest mobility, as shown by the attenuation model, and are not bioavailable, as they tend to associate with sulfide and organic matter originated in the mangrove forests of nearby Guaratiba area. |
| Databáze: | OpenAIRE |
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