Evidence for concentration of anthropogenic mercury in salt marsh sediments

Evidence for concentration of anthropogenic mercury in salt marsh sediments

Sediment cores from two salt marshes, Rosário (Tagus estuary) and Laranjo (Ria de Aveiro), were analyzed for total Hg and Al, and for Fe and Mn extracted with a hydroxylamine-acetic acid solution. Both areas have been contaminated by industrial discharges during the last decades. Vertical distributi...

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Autores principales: Micaelo, C, Válega, M, Vale, C, Pereira, E, Duarte, A, Caçador, I
Formato: Online
Lenguaje:eng
Publicado: Iniversidad Autónoma de Baja California 2003
Acceso en línea:https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/171
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spelling oai:cienciasmarinas.com.mx:article-1712019-04-24T19:34:39Z Evidence for concentration of anthropogenic mercury in salt marsh sediments Evidencia de la concentración de mercurio antropogénico en sedimentos de salitrales Micaelo, C Válega, M Vale, C Pereira, E Duarte, A Caçador, I mercury sediment salt marsh mercurio sedimento salitrales Sediment cores from two salt marshes, Rosário (Tagus estuary) and Laranjo (Ria de Aveiro), were analyzed for total Hg and Al, and for Fe and Mn extracted with a hydroxylamine-acetic acid solution. Both areas have been contaminated by industrial discharges during the last decades. Vertical distributions of Hg in sediments colonized by Arthrocnemum fruticosum and Halimione portulacoides were compared to profiles in non-vegetated sediments. The same vertical distribution pattern was observed in all situations: Hg enriched in sediment layers with high root density. Mercury concentrations reached 9.3 and 29.1 nmol g–1 in Rosário, and 149.0 and 196.0 nmol g–1 in Laranjo. At both marshes, higher concentrations were found in sediments colonized by H. portulacoides. These values are one order of magnitude above the levels found in nonvegetated sediments. Mercury was enriched in sediment layers containing high concentrations of Fe extracted with a hydroxylamine-acetic acid solution, indicating the importance of Fe (and Mn) oxides formed in the rooting sediments for the retention of anthropogenic Hg. Se analizaron Hg y Al totales, y Fe y Mn extraídos con solución hidroxilamina-ácido acético de núcleos de sedimento de los salitrales Rosario (Estuario del Tajo) y Laranjo (Ría de Aveiro) en Portugal. Ambas áreas han estado sujetas a contaminación por descargas industriales durante las últimas décadas. Se compararon las distribuciones verticales de Hg en sedimentos colonizados por Arthrocnemum fruticosum y Halimione portulacoides con las de sedimentos sin vegetación. En todos los casos el patrón de distribución fue el mismo: Las capas con gran densidad de raíces se encuentran enriquecidas en Hg. Las concentraciones de Hg alcanzaron 9.3 y 29.1 nmol g–1 en Rosario, y 149.0 y 196.0 nmol g–1 en Laranjo. En ambos salitrales, las mayores concentraciones se encontraron en sedimentos colonizados por H. portulacoides. Estos valores se encuentran un orden de magnitud por encima de los niveles encontrados en sedimentos sin vegetación. Se encontró enriquecimiento de Hg en capas de sedimento con elevadas concentraciones de Fe extraído con solución hidroxilamina-ácido acético, lo que sugiere la importancia que tienen, para la retención del mercurio antropogénico, los óxidos de Fe (y Mn) que se forman en sedimentos poblados con raíces. 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/171 10.7773/cm.v29i4.171 Ciencias Marinas; Vol. 29 No. 4 (2003); 447-456 Ciencias Marinas; Vol. 29 Núm. 4 (2003); 447-456 2395-9053 0185-3880 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/171/146
institution Ciencias Marinas
collection OJS
language eng
format Online
author Micaelo, C
Válega, M
Vale, C
Pereira, E
Duarte, A
Caçador, I
spellingShingle Micaelo, C
Válega, M
Vale, C
Pereira, E
Duarte, A
Caçador, I
Evidence for concentration of anthropogenic mercury in salt marsh sediments
author_facet Micaelo, C
Válega, M
Vale, C
Pereira, E
Duarte, A
Caçador, I
author_sort Micaelo, C
title Evidence for concentration of anthropogenic mercury in salt marsh sediments
title_short Evidence for concentration of anthropogenic mercury in salt marsh sediments
title_full Evidence for concentration of anthropogenic mercury in salt marsh sediments
title_fullStr Evidence for concentration of anthropogenic mercury in salt marsh sediments
title_full_unstemmed Evidence for concentration of anthropogenic mercury in salt marsh sediments
title_sort evidence for concentration of anthropogenic mercury in salt marsh sediments
description Sediment cores from two salt marshes, Rosário (Tagus estuary) and Laranjo (Ria de Aveiro), were analyzed for total Hg and Al, and for Fe and Mn extracted with a hydroxylamine-acetic acid solution. Both areas have been contaminated by industrial discharges during the last decades. Vertical distributions of Hg in sediments colonized by Arthrocnemum fruticosum and Halimione portulacoides were compared to profiles in non-vegetated sediments. The same vertical distribution pattern was observed in all situations: Hg enriched in sediment layers with high root density. Mercury concentrations reached 9.3 and 29.1 nmol g–1 in Rosário, and 149.0 and 196.0 nmol g–1 in Laranjo. At both marshes, higher concentrations were found in sediments colonized by H. portulacoides. These values are one order of magnitude above the levels found in nonvegetated sediments. Mercury was enriched in sediment layers containing high concentrations of Fe extracted with a hydroxylamine-acetic acid solution, indicating the importance of Fe (and Mn) oxides formed in the rooting sediments for the retention of anthropogenic Hg.
publisher Iniversidad Autónoma de Baja California
publishDate 2003
url https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/171
_version_ 1715723938644885504

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