Presence, distribution and contamination levels of lead in the surface sediments of the Ria of Ferrol (NW Spain)

Presence, distribution and contamination levels of lead in the surface sediments of the Ria of Ferrol (NW Spain)

This article discuss, using sediment samples from the Ria of Ferrol, the need for a better understanding of the biogeochemical cycle of lead in the Galician rias which, until now, was based on differing methodologies mainly applied to the biota in only few areas of the most important rias from a soc...

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Κύριοι συγγραφείς: Prego, R, Cobelo-García, A, Tubío, C, Barciela, MC
Μορφή: Online
Γλώσσα:eng
Έκδοση: Iniversidad Autónoma de Baja California 2003
Διαθέσιμο Online:https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/161
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id oai:cienciasmarinas.com.mx:article-161
record_format ojs
institution Ciencias Marinas
collection OJS
language eng
format Online
author Prego, R
Cobelo-García, A
Tubío, C
Barciela, MC
spellingShingle Prego, R
Cobelo-García, A
Tubío, C
Barciela, MC
Presence, distribution and contamination levels of lead in the surface sediments of the Ria of Ferrol (NW Spain)
author_facet Prego, R
Cobelo-García, A
Tubío, C
Barciela, MC
author_sort Prego, R
title Presence, distribution and contamination levels of lead in the surface sediments of the Ria of Ferrol (NW Spain)
title_short Presence, distribution and contamination levels of lead in the surface sediments of the Ria of Ferrol (NW Spain)
title_full Presence, distribution and contamination levels of lead in the surface sediments of the Ria of Ferrol (NW Spain)
title_fullStr Presence, distribution and contamination levels of lead in the surface sediments of the Ria of Ferrol (NW Spain)
title_full_unstemmed Presence, distribution and contamination levels of lead in the surface sediments of the Ria of Ferrol (NW Spain)
title_sort presence, distribution and contamination levels of lead in the surface sediments of the ria of ferrol (nw spain)
description This article discuss, using sediment samples from the Ria of Ferrol, the need for a better understanding of the biogeochemical cycle of lead in the Galician rias which, until now, was based on differing methodologies mainly applied to the biota in only few areas of the most important rias from a socio-economic point of view. Thirty-five samples of superficial sediment were analysed for lead (in the < 63 ∞m and total fractions) and opal percentage and organic carbon in the total. An analytical method is proposed employing ETAAS, whereby the sediment is introduced directly as a slurry together with the optimised amount of chemical modifiers. The accuracy of the method was checked by means of a certified reference material, obtaining a sensitivity of 2.72 ∞g g–1 Pb with an RSD of 5.9%. Values of lead in the superficial sediment of the Ria of Ferrol ranged from 13.5 to 159.1 ∞g g–1 for the fraction < 63 ∞m, and from 12.1 to 142.5 ∞g g–1 for the total fraction. The distribution does not follow a decreasing trend from the innermost part of the ria, as may have been expected, but rather the maximum values were found in the vicinity of the harbour area in the middle ria, indicating that rias behave as a lead deposition barrier avoiding the export of the metal to the open sea. Lead dispersion is mainly controlled by the tidal currents, given its lowest concentrations in the zones of strongest current, and also by the plankton, following the relationship obtained [Pb] = 48 [opal] + 16. A baseline lead concentration of 18.2 ∞g g–1 was obtained for the fraction < 63 ∞m using core samples dated at 3745 ± 70 years before present. Applying this background values, the lead enrichment in the Ria of Ferrol is classified from moderate to considerable.
publisher Iniversidad Autónoma de Baja California
publishDate 2003
url https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/161
_version_ 1715723937598406656
spelling oai:cienciasmarinas.com.mx:article-1612019-04-25T00:42:07Z Presence, distribution and contamination levels of lead in the surface sediments of the Ria of Ferrol (NW Spain) Presencia, distribución y niveles de contaminación de plomo en el sedimentos superficiales de la Ría de Ferrol (NO de España) Prego, R Cobelo-García, A Tubío, C Barciela, MC lead contamination sediment ria Galicia plomo contaminación sedimento ría Galicia This article discuss, using sediment samples from the Ria of Ferrol, the need for a better understanding of the biogeochemical cycle of lead in the Galician rias which, until now, was based on differing methodologies mainly applied to the biota in only few areas of the most important rias from a socio-economic point of view. Thirty-five samples of superficial sediment were analysed for lead (in the < 63 ∞m and total fractions) and opal percentage and organic carbon in the total. An analytical method is proposed employing ETAAS, whereby the sediment is introduced directly as a slurry together with the optimised amount of chemical modifiers. The accuracy of the method was checked by means of a certified reference material, obtaining a sensitivity of 2.72 ∞g g–1 Pb with an RSD of 5.9%. Values of lead in the superficial sediment of the Ria of Ferrol ranged from 13.5 to 159.1 ∞g g–1 for the fraction < 63 ∞m, and from 12.1 to 142.5 ∞g g–1 for the total fraction. The distribution does not follow a decreasing trend from the innermost part of the ria, as may have been expected, but rather the maximum values were found in the vicinity of the harbour area in the middle ria, indicating that rias behave as a lead deposition barrier avoiding the export of the metal to the open sea. Lead dispersion is mainly controlled by the tidal currents, given its lowest concentrations in the zones of strongest current, and also by the plankton, following the relationship obtained [Pb] = 48 [opal] + 16. A baseline lead concentration of 18.2 ∞g g–1 was obtained for the fraction < 63 ∞m using core samples dated at 3745 ± 70 years before present. Applying this background values, the lead enrichment in the Ria of Ferrol is classified from moderate to considerable. El artículo aborda, a partir del sedimento de la Ría de Ferrol, la necesidad de un mayor conocimiento del ciclo biogeoquímico del plomo en las rías gallegas, basado hasta este momento en metodologías dispares aplicadas primordialmente a la biota en zonas puntuales de las rías más importantes socioeconómicamente. Se partió de 35 muestras de sedimento superficial, en cuya fracción total se analizaron la concentración de plomo, los porcentajes de ópalo y el carbono orgánico, mientras que en la fracción < 63 µm sólo se midió el plomo. Para estas muestras se propuso un procedimiento analítico basado en la espectrometría de absorción atómica con atomización en cámara de grafito, donde el sedimento en forma de suspensión se introdujo directamente junto con la cantidad optimizada de modificadores químicos. La exactitud del método se verificó mediante el uso de un material de referencia, obteniéndose una sensibilidad de 2.72 µg g–1 de Pb y una precisión de RSD 5.9 %. Los valores medidos para el plomo en el sedimento superficial de la Ría de Ferrol se encontraron entre 13.5 y 159.1 µg g–1 para la fracción menor de 63 µm y de 12.1 a 142.5 µg g–1 para la total. La distribución no sigue en patrón decreciente desde el fondo de la ría, como era de esperar, sino que tiene su máximo en el área portuaria situada en la parte media de la ría, indicando que las rías deben actúar como una barrera de deposición de plomo. En la dispersión de este metal intervienen principalmente la marea, dada su menor concentración en zonas de mayor corriente, y el plancton, por la relación: [Pb] = 48 [ópalo] + 16. Se ha cuantificado un valor de fondo de 18.2 µg g–1 de Pb para la fracción sedimentaria < 63 µm con muestras fechadas con 3745 ± 70 años de antigüedad. Aplicando éste, los factores de enriqueciminento para la Ría de Ferrol permiten clasificar su contaminación por plomo entre moderada y considerable. Iniversidad Autónoma de Baja California 2003-03-06 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/161 10.7773/cm.v29i4.161 Ciencias Marinas; Vol. 29 No. 4 (2003); 561-571 Ciencias Marinas; Vol. 29 Núm. 4 (2003); 561-571 2395-9053 0185-3880 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/161/137

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