Metals content in surface waters of an upwelling system of the northern Humboldt Current (Mejillones Bay, Chile)

Román

Rivera

et al. 2011

Environ Monit Assess

Self Cite

We measured the concentration of 12 metals in coastal waters of seven sites of San Jorge Bay in Antofagasta (northern Chile), in order to relate the presence of metals with the different uses of San Jorge Bay coastal border, and to evaluate the quality of the bay's bodies of water according to the proposed current Chilean Quality Guide for trace elements in seawater (CONAMA 2003). The results suggest that the coastal water of San Jorge Bay has very good quality according to the proposed regulation mentioned above. However, the distribution of metals such as Cu and Pb along the bay's coast line evidences a notorious effect of the industrial activity, which would involve different behavior patterns for some trace elements in some bodies of water, suggesting that the levels indicated in the environmental guideline of the Chilean legislation do not represent pollution-free environments.

Section: Analytical Proceduresmentioning

confidence: 99%

Metal contents in coastal waters of San Jorge Bay, Antofagasta, northern Chile: a base line for establishing seawater quality guidelines

Román

Rivera

et al. 2011

Environ Monit Assess

Self Cite

“…In order to test whether trace metals are related to availability in seawater or preconcentration in biodetritus we plotted some metal excess contents of sediments of Mejillones (this study) vs. seawater contents reported by Valdés et al (2008) for this same bay. We use the model proposed by Bóning et al, 2004 andBöning et al, 2009 for metals accumulated within and below the OMZ in the Peruvian, Namibian and Chilean coastal zone, which separates metals related to a seawater source from those related to a biodetritus source.…”

Section: Trace Metal Source/sink Relations In Mejillones Baymentioning

confidence: 99%

“…These factors have favored the accumulation of diatomaceous sediments, rich in organic matter, and with minimal signs of bioturbation (Vargas et al, 2004;Valdés et al, 2009). As a result, the sedimentary records present a high potential for paleo-ocean-climatic reconstruction, (Ortlieb et al, 2000, Vargas et al, 2007, Valdés et al, 2008, Caniupán et al, 2009and Díaz-Ochoa et al, 2011). …”

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

Journal of Geochemical Exploration

Sifeddine

Boussafir

et al. 2014

Self Cite

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.

“…Este desarrollo industrial ha generado una gran presión de uso sobre el entorno marino. Por otra parte, no son muchos los trabajos que relacionan este crecimiento industrial con el sistema costero de la bahía de Mejillones y que abarcan los sedimentos submareales (Valdés et al, 2005(Valdés et al, , 2008Valdés, 2012). Por el contrario, hay gran cantidad de información sobre mecanismos y procesos oceanográficos tales como eventos de surgencia, productividad biológica, variabilidad ENOS, evolución océano-climática, entre otros aspectos (Rodríguez et al, 1991;Marín et al, 1993;Escribano, 1998;Marín & Olivares, 1999;Ortlieb et al, 2000;Páez & Frías, 2001;González et al, 2004;Vargas et al, 2007).…”

unclassified

Contenido de metales en sedimentos y en Emerita analoga (Stimpson, 1857), en bahia Mejillones del Sur, Chile

Guíñez

Castillo

2015

lajar

Contenido de metales en sedimentos y en (Stimpson, 1857) in eight sectors of south Mejillones Bay, Chile was determined. Only Zn showed a certain degree of contamination in the sediments of the bay with a rate of geoaccumulation of 2.8. In analyzing the content of metals in E. analoga, we determined that this species would bioaccumulate some of the metals analyzed but low magnitude, with the exception of Zn bioaccumulation factor of 2.07. The similarity dendrogram performed with bioaccumulation index data related the values of this index with the spatial distribution of major industries and urban areas. This concordance allows establishing that E. analoga be responding as an indicator of environmental health for this system. It is also important to note that this bay is experiencing the first signs of a moderately impacted industrial area. Therefore it is necessary to generate consistent measurements, covering more than an environmental matrix, in order to control the human impact in this highly productive coastal marine ecosystem.