Catálogo CEIBA de la Biblioteca Central de FAUBA


Vista normal Vista MARC Vista ISBD

Heavy metal partitioning in bottom sediments of the Matanza - Riachuelo River and main tributary streams

Por: Rendina, Alicia Elena.
Colaborador(es): Fabrizio de Iorio, Alicia Rosa.
ISSN: 1532-0383.Tipo de material: Artículos y capítulos. Recurso electrónico.Tema(s): ACID VOLATILE SULFIDE | BOTTOM SEDIMENTS | HEAVY METALS | MATANZA-RIACHUELO RIVER | SEQUENTIAL EXTRACTION | ACID VOLATILE SULFIDES | CORE SEDIMENTS | GEOCHEMICAL PARTITIONING | HEAVY METAL PARTITIONING | REMOBILIZATION | RIVER SYSTEMS | SEQUENTIAL EXTRACTION PROCEDURE | VERTICAL DISTRIBUTIONS | WATER COLUMNS | BIOCHEMISTRY | CADMIUM | EXTRACTION | HYDROCHLORIC ACID | METALS | POSITIVE IONS | RIVER POLLUTION | RIVERS | SEDIMENTOLOGY | SULFUR COMPOUNDS | ZINC | ZINC SULFIDE | SEDIMENTS | Recursos en línea: Haga clic para acceso en línea | LINK AL EDITOR. En: Soil and Sediment Contamination vol.21, no.1 (2012), p.62-81Resumen: This study provides geochemical partitioning, potential bioavailability, and enrichment of Cd, Cu, Pb, and Zn in bottom sediments collected from the Matanza-Riachuelo River and its main tributary streams. A modified Tessier sequential extraction procedure, complemented with acid volatile sulfide [AVS] and simultaneous extracted metals [SEM] measurements, was applied to determine the partitioning of metals into four fractions [metals bound to amorphous sulfide, carbonate, and exchangeable], bound to Fe/Mn oxides [reducible], bound to organic matter/sulfide [oxidizable] and residual. Spatial and vertical distributions of metals were studied. The core sediments show a decreasing concentration of metals with depth. In top sediments, non-residual Cu was mainly associated with oxidizable phase, whereas Pb, Cd, and Zn were mainly associated with amorphous sulfide. Pb exhibited the highest enrichment in all sites. The ratio AVS/SEM was greater than one at sediment sections close to the water column, indicating that metals extracted with hydrochloric acid were mainly associated with the amorphous sulfide. The strong influence of amorphous sulfide in the retention of Cd, Pb, and Zn in anoxic sediments of Matanza-Riachuelo river system suggests that dredging and aeration could lead to the remobilization of metals from sediments to the water column, hence making the metals more available to the biota.
Etiquetas de esta biblioteca: No hay etiquetas de esta biblioteca para este título. Ingresar para agregar etiquetas.
    valoración media: 0.0 (0 votos)

This study provides geochemical partitioning, potential bioavailability, and enrichment of Cd, Cu, Pb, and Zn in bottom sediments collected from the Matanza-Riachuelo River and its main tributary streams. A modified Tessier sequential extraction procedure, complemented with acid volatile sulfide [AVS] and simultaneous extracted metals [SEM] measurements, was applied to determine the partitioning of metals into four fractions [metals bound to amorphous sulfide, carbonate, and exchangeable], bound to Fe/Mn oxides [reducible], bound to organic matter/sulfide [oxidizable] and residual. Spatial and vertical distributions of metals were studied. The core sediments show a decreasing concentration of metals with depth. In top sediments, non-residual Cu was mainly associated with oxidizable phase, whereas Pb, Cd, and Zn were mainly associated with amorphous sulfide. Pb exhibited the highest enrichment in all sites. The ratio AVS/SEM was greater than one at sediment sections close to the water column, indicating that metals extracted with hydrochloric acid were mainly associated with the amorphous sulfide. The strong influence of amorphous sulfide in the retention of Cd, Pb, and Zn in anoxic sediments of Matanza-Riachuelo river system suggests that dredging and aeration could lead to the remobilization of metals from sediments to the water column, hence making the metals more available to the biota.

No hay comentarios para este ítem.

Ingresar a su cuenta para colocar un comentario.

Av. San Martín 4453 - 1417 – CABA – Argentina.
Sala de lectura de Planta Baja: bibliote@agro.uba.ar (54 11) 5287-0013
Referencia: referen@agro.uba.ar (54 11) 5287-0418
Hemeroteca: hemerote@agro.uba.ar (54 11) 5287-0218