Bioavailability of heavy metals in the Guadalete River Estuary (SW Iberian Peninsula)

Bioavailability of heavy metals in the Guadalete River Estuary (SW Iberian Peninsula)

Sediments in the Guadalete River estuary were studied to determine the bioavailability of five common metals (Cu, Zn, Cd, Pb and Ni) in order to evaluate the toxicity of the sediment. Total sediment dry weight concentrations of heavy metals, simultaneously extracted metals (SEM) and acid volatile su...

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Hlavní autoři: Campana, O, Rodríguez, A, Blasco, J
Médium: Online
Jazyk:eng
Vydáno: Iniversidad Autónoma de Baja California 2005
On-line přístup:https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/100
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spelling oai:cienciasmarinas.com.mx:article-1002019-04-25T17:45:09Z Bioavailability of heavy metals in the Guadalete River Estuary (SW Iberian Peninsula) Biodisponibilidad de metales pesa dos en el Estuario del Río Gu adalete (SO Península Ibérica) Campana, O Rodríguez, A Blasco, J Sediment bioavailability metals SEM AVS sedimento biodisponibilidad metales SEM AVS Sediments in the Guadalete River estuary were studied to determine the bioavailability of five common metals (Cu, Zn, Cd, Pb and Ni) in order to evaluate the toxicity of the sediment. Total sediment dry weight concentrations of heavy metals, simultaneously extracted metals (SEM) and acid volatile sulfides (AVS) were analyzed. Interstitial water criteria toxic units (IWCTU) were calculated and used as criteria to evaluate toxicity, making reference to the Sediment Quality Guidelines developed by the US Environmental Protection Agency. Diffusive fluxes through the sediment-water interface were also analyzed. The balance of deposition and return fluxes demonstrated the efficiency of estuarine sediment from Guadalete as sink for metal contaminants. The ratio between SEM and AVS was smaller than one, apparently indicating that the sediment was not toxic; however, the high concentrations of Cu and Pb in pore water make further investigations necessary to evaluate the real bioavailability and bioaccumulation of trace metals to show the obviousness of toxicity. Se analizaron los sedimentos del Estuario del Río Guadalete con el fin de determinar la biodisponibilidad de los metales Cu, Zn, Cd, Pb y Ni, y evaluar la toxicidad de los sedimentos. Se analizó la concentración total de metales, los metales extraídos simultáneamente (SEM), y los sulfuros volátiles ácidos (AVS). Para la evaluación de la toxicidad se calcularon y emplearon los criterios de unidades tóxicas para el agua intersticial (IWCTU). Para ello se emplearon las referencias propuestas por las Guías de Calidad de Sedimentos desarrolladas por la Agencia de Protección Ambiental de Estados Unidos (USEPA). También se ha procedido al análisis de los flujos difusivos a través de la interfase agua-sedimento. Los balances de flujo de entrada y salida mostraron la eficiencia de los sedimentos del Estuario del Guadalete como sumidero de contaminación metálica. La proporción entre SEM y AVS fue menor que 1, e indicaba, en principio, que el sedimento no era tóxico. No obstante, las altas concentraciones de Cu y Pb en el agua intersticial ponen de manifiesto la necesidad de evaluar la biodisponibilidad real y la bioacumulación de los metales a fin de establecer de manera inequívoca la no toxicidad de los sedimentos. Iniversidad Autónoma de Baja California 2005-03-06 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article Artículo Arbitrado application/pdf https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/100 10.7773/cm.v31i12.100 Ciencias Marinas; Vol. 31 No. 1B (2005); 135-147 Ciencias Marinas; Vol. 31 Núm. 1B (2005); 135-147 2395-9053 0185-3880 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/100/80
institution Ciencias Marinas
collection OJS
language eng
format Online
author Campana, O
Rodríguez, A
Blasco, J
spellingShingle Campana, O
Rodríguez, A
Blasco, J
Bioavailability of heavy metals in the Guadalete River Estuary (SW Iberian Peninsula)
author_facet Campana, O
Rodríguez, A
Blasco, J
author_sort Campana, O
title Bioavailability of heavy metals in the Guadalete River Estuary (SW Iberian Peninsula)
title_short Bioavailability of heavy metals in the Guadalete River Estuary (SW Iberian Peninsula)
title_full Bioavailability of heavy metals in the Guadalete River Estuary (SW Iberian Peninsula)
title_fullStr Bioavailability of heavy metals in the Guadalete River Estuary (SW Iberian Peninsula)
title_full_unstemmed Bioavailability of heavy metals in the Guadalete River Estuary (SW Iberian Peninsula)
title_sort bioavailability of heavy metals in the guadalete river estuary (sw iberian peninsula)
description Sediments in the Guadalete River estuary were studied to determine the bioavailability of five common metals (Cu, Zn, Cd, Pb and Ni) in order to evaluate the toxicity of the sediment. Total sediment dry weight concentrations of heavy metals, simultaneously extracted metals (SEM) and acid volatile sulfides (AVS) were analyzed. Interstitial water criteria toxic units (IWCTU) were calculated and used as criteria to evaluate toxicity, making reference to the Sediment Quality Guidelines developed by the US Environmental Protection Agency. Diffusive fluxes through the sediment-water interface were also analyzed. The balance of deposition and return fluxes demonstrated the efficiency of estuarine sediment from Guadalete as sink for metal contaminants. The ratio between SEM and AVS was smaller than one, apparently indicating that the sediment was not toxic; however, the high concentrations of Cu and Pb in pore water make further investigations necessary to evaluate the real bioavailability and bioaccumulation of trace metals to show the obviousness of toxicity.
publisher Iniversidad Autónoma de Baja California
publishDate 2005
url https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/100
_version_ 1715723921709334528

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