Influence of the very polluted inputs of the Tinto–Odiel system on the adjacent littoral sediments of southwestern spain: A statistical approach

Sáinz, Ángel Gutiérrez; Muñoz, Francisco Ruíz

doi:10.1016/j.chemosphere.2005.06.045

Cited by 80 publications

(39 citation statements)

References 28 publications

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“…These results are consistent with the fact that this core was collected in an area located in the submarine prodelta of the River Guadalquivir, which is the main fluvial input of the Gulf of Cádiz. Hg levels found in this core fall within the range detected in sediments from the River Guadiamar, a tributary of the River Guadalquivir, and in littoral sediments under the influence of the Odiel system (Alastuey et al, 1999;Usero et al, 2005;Sáinz and Ruiz, 2006).…”

Section: Sediment Geochemistrymentioning

confidence: 66%

Sediment geochemistry and accumulation rates on the northeastern shelf of the Gulf of Cádiz (SW Iberian Peninsula)

Guerra¹,

Dinelli²,

Righi³

et al. 2010

Sci. Mar.

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SUMMARY: Geochemistry, total organic carbon and total nitrogen of three sediment cores collected in the Gulf of Cádiz and the Guadalquivir prodelta areas in Spain were investigated. The C/N ratio, mostly around 10, seems to indicate a predominantly marine origin for the sedimentary organic matter. Major and minor elements (Si, Ti, Al, Fe, Mg, Ca, K, Na, P, S) and trace elements (Mn, Sc, V, Cr, Ni, Cu, Zn, Rb, Sr, Y, Zr, Ba, Ce, Pb, Hg) showed significant differences in bulk chemical composition between the two areas. Despite the effects of bioturbation, vertical changes in downcore profiles of heavy metals occur only in the cores of the Cádiz area, although the concentrations keep to low levels. The relatively high concentrations of Zr and Y, elements commonly associated with the heavy minerals fraction, at the top of cores from the Cádiz area are attributed to an enrichment of heavy minerals related to selective transport that concentrates this fraction. 137 Cs and 210 Pb activities in one of the two sediment cores collected in the Gulf of Cádiz were also measured. The distribution of excess 210 Pb was used to determine the modern (last 100 yr) mass accumulation rate and the depth of sediment mixing on the continental shelf of the gulf. Estimated sediment accumulation rate was 0.1 g cm -2 yr -1 . The uppermost 4 cm had uniform excess 210 Pb activity profiles above a region of steadily decreasing 210 Pb activity, and this phenomenon was attributed to sediment mixing (bioturbation). 137 Cs activity was lower than 3 Bq kg -1 and the profile does not show evidence of fallout peaks.

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Section: Sediment Geochemistrymentioning

confidence: 66%

Sediment geochemistry and accumulation rates on the northeastern shelf of the Gulf of Cádiz (SW Iberian Peninsula)

Guerra¹,

Dinelli²,

Righi³

et al. 2010

Sci. Mar.

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“…Para los valores preindustriales, normalmente se utilizan concentraciones de formaciones geológicas como pizarras (Turekian & Wedepohl, 1961) o aquellos correspondientes a la corteza continental (Taylor, 1972). Sin embargo, en aquellos lugares en donde los sedimentos preservan su estructura primaria y, por lo tanto, no existe mezcla vertical de ellos, es factible utilizar valores provenientes de muestras de columnas de sedimento que sean equivalentes a períodos anteriores al desarrollo industrial de dicha zona (Sainz & Ruiz, 2006). En el caso de Tabla 3.…”

Section: Discussionunclassified

Composición elemental y contenido de metales en sedimentos marinos de la bahía Mejillones de Sur, Chile

Valdés

Sifeddine

2009

Lat. Am. J. Aquat. Res.

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RESUMEN.Se midió la concentración de carbono total, nitrógeno total, azufre total, materia orgánica, Ni, Cd, Pb, Cu y Zn en sedimentos costeros (10 m de profundidad de columna de agua) de ocho sectores de la bahía Mejillones. La composición elemental de los sedimentos sería el resultado de la abundante materia orgáni-ca autóctona presente en este sistema costero. El orden de abundancia de los metales analizados fue: Zn > Cu > Ni > Pb > Cd. La concentración de metales no se explicaría por el contenido de materia orgánica ni la composición granulométrica de los sedimentos costeros. La evaluación del contenido de metales en los sedimentos, mostró que el Ni, Zn y Pb estarían levemente enriquecidos en la actualidad, aún cuando los valores se mantienen dentro de un rango cercano a los niveles preindustriales. El análisis del dendrograma de similitud de los sectores de estudio separó la línea de costa de Mejillones en dos grandes zonas; una asociada a la actividad industrial desarrollada en la bahía, y otra correspondiente al área de desarrollo urbano de Mejillones con características similares a aquellos ambientes libres de actividad antrópica directa. Palabras clave: sedimentos marinos, metales pesados, análisis elemental, Mejillones, Chile. Elemental composition and metal contents in the marine sediments of Mejillones del SurBay, Chile: an environmental assessment of the coastal zone ABSTRACT. The total carbon, total nitrogen, total sulphur, organic matter, Ni, Cd, Pb, Cu, and Zn concentrations were measured in coastal sediments (10 m water depth) at eight stations in Mejillones Bay. The elemental composition of these sediments is a function of the autochthonous organic matter generated in this coastal system. The order of abundance for the metals was: Zn > Cu > Ni > Pb > Cd. The metal content is not explained by the organic matter content or grain size of these coastal sediments. The evaluation of the concentration metals in the sediments showed that Ni, Zn, and Pb are slightly enriched at the present, although with values that are similar to preindustrial concentrations. A cluster analysis of the similarity in the study area separated the Mejillones coast into two main zones: one related to the industrial activity developed in this bay and the other related to the urban develop of Mejillones city, with characteristics similar to environments free of direct human activity.

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“…Cd, Cu, Ni, Fe, Zn) are used by primary producers as micronutrients essential for various physiological processes (Biller and Bruland, 2013). On the other hand, all the metals analyzed in this study except for Al and Ti are regarded as redox-sensitive, meaning that the oxygenation level of the sea environment affects the exchange of these metals between the sediments and the water column (Morford et al, 2001 andSainz andRuiz, 2006). Mn and Fe tend to accumulate in the bottom sediments under oxic conditions, whereas the other metals accumulate in the sediments under dysoxic/anoxic conditions (Tribovillard et al, 2006).…”

Section: Factors Influencing the Metal Distribution In Mejillones Baymentioning

confidence: 99%

“…This feature makes metals excellent markers for oxygen deficient conditions, whether to assess current deposition environments or to reconstruct paleooxygenation conditions on different time scales (Morford et al, 2001 andSainz andRuiz, 2006). However, the use of metals as markers of past and present conditions requires understanding the geochemical response of these metals to different environmental parameters.…”

Section: Introductionmentioning

confidence: 99%

Redox conditions in a coastal zone of the Humboldt system (Mejillones, 23° S). Influence on the preservation of redox-sensitive metals

Valdés

Sifeddine

Boussafir

et al. 2014

Journal of Geochemical Exploration

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The distribution of, Co, Mo, Zn, Ni, Cd, U, Cu, Mn, V, Al, Fe, Ti, Total Organic Carbon (TOC) and Total Sulfur (TS) was studied in surface sediments accumulated at the upper limit of the oxygen minimum zone in the northern Humboldt Current (Mejillones Bay), using samples taken during two cruises in May 2002 and October 2004. The time series of dissolved oxygen revealed a seasonal fluctuation of the upper limit of the oxygen minimum zone into the bay.Similar bathymetric distribution curves of the metals measured in the two studied periods in the OMZ off northern Chile suggest that the factors responsible for this distribution are persistent over time. Authigenic metal content was calculated using lithogenic background by determining Metal/Al ratio from local aeolian dust, instead of average shale values, which are classically used for background correction. This more precise assessment allows examination of the source-sink relation of each metal in this coastal zone. Mo preserved in the bottom sediments originates from seawater and accumulates via particulate shuttle, whereas Cd is pre-concentrated in biodetritus. Ni, Mn, V and Fe show a combined behavior.Sulfate reduction is not the most important mechanism affecting metal accumulation in Mejillones Bay, probably due to the presence of Thioploca, which inhibits the pyrite formation and the metal-sulfide reaction.We propose the use of the authigenic Mo/U ratio and a preliminary statistical model to reconstruct the levels of paleoxygenation in the subsurface waters of Mejillones Bay, by analyzing the same metals measured throughout the sedimentary sequences (and using the same statistical procedure), at least to identify extreme variations of the OMZ in this bay of northern Chile.

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Influence of the very polluted inputs of the Tinto–Odiel system on the adjacent littoral sediments of southwestern spain: A statistical approach

Cited by 80 publications

References 28 publications

Sediment geochemistry and accumulation rates on the northeastern shelf of the Gulf of Cádiz (SW Iberian Peninsula)

Sediment geochemistry and accumulation rates on the northeastern shelf of the Gulf of Cádiz (SW Iberian Peninsula)

Composición elemental y contenido de metales en sedimentos marinos de la bahía Mejillones de Sur, Chile

Redox conditions in a coastal zone of the Humboldt system (Mejillones, 23° S). Influence on the preservation of redox-sensitive metals

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