Heavy metal speciation in the surface water dissolved fraction of the low watershed and plume of the Manzanares River, Sucre State, Venezuela

Heavy metal speciation in the surface water dissolved fraction of the low watershed and plume of the Manzanares River, Sucre State, Venezuela

 This paper reports on the speciation of heavy metals (Cd, Pb, Cr, Cu, Ni, Mn, Fe, and Zn) in the surface water dissolved fraction of the low basin and plume of the Manzanares River, in the state of Sucre, Venezuela, based on data taken at 22 stations from July 1996 to June 1997. The total...

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Autores principales: Martínez, G, Senior, W, Márquez, A.
Formato: info:eu-repo/semantics/article
Lenguaje:eng
Publicado: Iniversidad Autónoma de Baja California 2006
Materias:
heavy metal speciation
Manzanares River
dissolved fraction
especiación de metales pesados
Río Manzanares
fracción disuelta
Acceso en línea:https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/1064
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spelling repositorioinstitucional-20.500.12930-74032023-05-09T14:30:57Z Heavy metal speciation in the surface water dissolved fraction of the low watershed and plume of the Manzanares River, Sucre State, Venezuela Especiación de metales pesados en la fracción disuelta de las aguas superficiales de la cuenca baja y la pluma del Río Manzanares, Estado Sucre, Venezuela Martínez, G Senior, W Márquez, A. heavy metal speciation Manzanares River dissolved fraction especiación de metales pesados Río Manzanares fracción disuelta  This paper reports on the speciation of heavy metals (Cd, Pb, Cr, Cu, Ni, Mn, Fe, and Zn) in the surface water dissolved fraction of the low basin and plume of the Manzanares River, in the state of Sucre, Venezuela, based on data taken at 22 stations from July 1996 to June 1997. The total metal concentrations in the dissolved phase ranged from below detection levels to 0.01, 0.02, 0.02, 0.10, 0.10, 1.03, 2.56, and 5.13 µmol L–1 for Cd, Pb, Cr, Cu, Ni, Mn, Fe, and Zn, respectively. Overall, the metals studied revealed a nonconservative behavior with removal at low salinities, likely due to anthropogenic contributions and to flocculation on account of Fe- and Mn-oxyhydroxide formation resulting from the shifts in pH and ion forces that ensue when the fresh waters of the river meet the marine water mass of the Gulf of Cariaco. The heavy metals in the dissolved fraction, in both free and hydrated form, had a composition in which the largest proportions were associated with humic acids, thus being more readily available to organisms. Se estudió la especiación de los metales pesados Fe, Mn, Ni, Cr, Cu, Cd, Pb y Zn en la fracción disuelta en las agues superficiales de la cuenca baja y pluma del Río Manzanares, Estado Sucre, Venezuela, durante el periodo comprendido entre julio de 1996 y junio de 1997, en 22 estaciones establecidas en la cuenca baja y pluma de dicho río. Las concentraciones totales de los metales en la fracción disuelta variaron de no detectado a 0.01 µmol L–1 para el Cd, de no detectado a 5.13 µmol L–1 para el Zn, de no detectado a 0.10 µmol L–1 para el Cu, de no detectado a 0.02 µmol L–1 para el Cr, de no detectado a 2.56 µmol L–1 para el Fe, de no detectado a 1.03 µmol L–1 para el Mn, de no detectado a 0.10 µmol L–1 para el Ni y de no detectado a 0.02 µmol L–1 para el Pb. En general, los metales evaluados presentaron un comportamiento no conservativo con remoción a bajas salinidades posiblemente debida a la floculación al formarse oxihidróxidos de Fe y Mn como consecuencia de los cambios de pH y fuerza iónica que ocurren cuando se mezclan las aguas dulces del río con las marinas del Golfo de Cariaco, además de observarse aportes de estos elementos a todo lo largo de la pluma debido a las actividades humanas que se desarrollan en la zona. De igual manera, los metales pesados en la fracción disuelta presentan una composición en la que las mayores proporciones se encuentran asociadas a los ácidos húmicos (extraídos con la resina DEAE) y en forma libre e hidratada (extraídos con la resina Chelex-100), las cuales son las especies más disponibles para los organismos vivos. 2006-06-23 2021-06-03T03:55:11Z 2021-06-03T03:55:11Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article Artículo Arbitrado https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/1064 10.7773/cm.v32i21.1064 https://hdl.handle.net/20.500.12930/7403 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/1064/948 application/pdf Iniversidad Autónoma de Baja California Ciencias Marinas; Vol. 32 No. 2 (2006); 239-257 Ciencias Marinas; Vol. 32 Núm. 2 (2006); 239-257 2395-9053 0185-3880
institution Repositorio Institucional
collection DSpace
language eng
topic heavy metal speciation
Manzanares River
dissolved fraction
especiación de metales pesados
Río Manzanares
fracción disuelta
spellingShingle heavy metal speciation
Manzanares River
dissolved fraction
especiación de metales pesados
Río Manzanares
fracción disuelta
Martínez, G
Senior, W
Márquez, A.
Heavy metal speciation in the surface water dissolved fraction of the low watershed and plume of the Manzanares River, Sucre State, Venezuela
description  This paper reports on the speciation of heavy metals (Cd, Pb, Cr, Cu, Ni, Mn, Fe, and Zn) in the surface water dissolved fraction of the low basin and plume of the Manzanares River, in the state of Sucre, Venezuela, based on data taken at 22 stations from July 1996 to June 1997. The total metal concentrations in the dissolved phase ranged from below detection levels to 0.01, 0.02, 0.02, 0.10, 0.10, 1.03, 2.56, and 5.13 µmol L–1 for Cd, Pb, Cr, Cu, Ni, Mn, Fe, and Zn, respectively. Overall, the metals studied revealed a nonconservative behavior with removal at low salinities, likely due to anthropogenic contributions and to flocculation on account of Fe- and Mn-oxyhydroxide formation resulting from the shifts in pH and ion forces that ensue when the fresh waters of the river meet the marine water mass of the Gulf of Cariaco. The heavy metals in the dissolved fraction, in both free and hydrated form, had a composition in which the largest proportions were associated with humic acids, thus being more readily available to organisms.
format info:eu-repo/semantics/article
author Martínez, G
Senior, W
Márquez, A.
author_facet Martínez, G
Senior, W
Márquez, A.
author_sort Martínez, G
title Heavy metal speciation in the surface water dissolved fraction of the low watershed and plume of the Manzanares River, Sucre State, Venezuela
title_short Heavy metal speciation in the surface water dissolved fraction of the low watershed and plume of the Manzanares River, Sucre State, Venezuela
title_full Heavy metal speciation in the surface water dissolved fraction of the low watershed and plume of the Manzanares River, Sucre State, Venezuela
title_fullStr Heavy metal speciation in the surface water dissolved fraction of the low watershed and plume of the Manzanares River, Sucre State, Venezuela
title_full_unstemmed Heavy metal speciation in the surface water dissolved fraction of the low watershed and plume of the Manzanares River, Sucre State, Venezuela
title_sort heavy metal speciation in the surface water dissolved fraction of the low watershed and plume of the manzanares river, sucre state, venezuela
publisher Iniversidad Autónoma de Baja California
publishDate 2006
url https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/1064
_version_ 1792610474731241472

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