Mercury flux to estuarine sediments, derived from Pb-210 and Cs-137 geochronologies (Guaratuba Bay, Brazil)

Sanders, Christian J.; Santos, Isaac R.; Silva-Filho, Emmanoel V.; Patchineelam, Sambasiva R.

doi:10.1016/j.marpolbul.2006.06.004

Cited by 79 publications

(37 citation statements)

References 13 publications

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“…Increasing Hg fluxes were also observed by Sanders et al, 39 2006. According to Godoy et al,6 2002, this tendency in Hg fluxes is an indication of increasing agricultural activity, which have been used in fertilizers that have Hg as a subproduct.…”

Section: Guaratuba Bay Prsupporting

confidence: 61%

A historical evaluation of anthropogenic impact in coastal ecosystems by geochemical signatures

Patchineelam¹,

Sanders²,

Smoak³

et al. 2011

J. Braz. Chem. Soc.

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Section: Guaratuba Bay Prsupporting

confidence: 61%

A historical evaluation of anthropogenic impact in coastal ecosystems by geochemical signatures

Patchineelam¹,

Sanders²,

Smoak³

et al. 2011

J. Braz. Chem. Soc.

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“…Only limited radioisotope research has been carried out in the Equatorial and Southern Hemisphere countries partly because of the low fallout of 210 Pb and 137 Cs and associated difficulties to detect concentrations above analytical detection limits Ruiz-Fernández and Hillaire-Marcel 2009). As most nuclear testing took place in the Northern Hemisphere, 137 Cs is particularly difficult to detect South of the Equator; and investigations in tropical regions have been confined to Brazil (Sanders et al 2006(Sanders et al , 2010aSaito et al 2001), México (Ruiz-Fernández et al 2005, 2007a, 2009a, Australia (Pfitzner et al 2004), and South Africa (Kading et al 2009;Humphries et al 2010). In Colombia, similar studies are inexistent.…”

Section: Introductionmentioning

confidence: 99%

210Pb-derived Sedimentation Rates and Corg Fluxes in Soledad Lagoon (Cispatá Lagoon System, NW Caribbean Coast of Colombia)

Ruiz-Fernández

Marrugo‐Negrete

Paternina–Uribe

et al. 2011

Estuaries and Coasts

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With the aim of evaluating temporal changes in sedimentation and organic carbon (C org ) supplied over the last~100 years, a sediment core was collected at Soledad Lagoon, a costal ecosystem surrounded by mangroves, located in the Cispatá Estuary (Caribbean coast of Colombia). The core sediments were characterized by low concentrations of calcium carbonate (0.2-2.9%), organic matter (3-8%), total nitrogen (0.11-0.38%), and total phosphorus (0.19-0.65 mg g −1 ). Fe and Al concentrations ranged from 4% to 5%, and Mn from 356 to 1,047 μg g −1 .The 210 Pb-derived sediment and mass accumulation rates were 1.54±0.18 mm year −1 and 0.08±0.01 gcm −2 year −1 , respectively. The sediment core did not provide evidence of human impact, such as enhancement of primary production or nutrient enrichment, which may result from recent land uses changes or climate change. The C org fluxes estimated for Soledad Lagoon core lay in the higher side of carbon fluxes to coastal ecosystems (314-409 gm −2 year −1 ) and the relatively high C org preservation observed (~45%) indicate that these lagoon sediments has been a net and efficient sink of C org during the last century, which corroborate the importance of mangrove areas as important sites for carbon burial and therefore, long-term sequestration of C org .

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“…[1][2][3] Consequently, many studies dealing with the main pathways of Hg accumulation in coastal sediments have investigated the contributions of different contamination sources of this metal near the sediment-water interface. [4][5][6] Sediment constituents potentially involved in binding Hg, and consequently in its burial efficiency within sediments, include Fe and Mn oxyhydroxides, organic matter and metal sulfides, [7][8][9] besides the possible importance of grain size in determining the Hg adsorption capacity of sediments. [10][11] Moreover, in evaluating the biogeochemical controls on Hg distribution in sediments it is important to note that upper sediment layers may develop vertical and lateral stratifications in the predominant physicochemical conditions that affect redox-sensitive Hg-binding phases.…”

Section: Introductionmentioning

confidence: 99%

Mercury accumulation in sediments along an eutrophication gradient in Guanabara Bay, southeast Brazil

Machado

Santelli

Loureiro

et al. 2008

J. Braz. Chem. Soc.

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A acumulação de Hg foi investigada em testemunhos sedimentares da Baía de Guanabara, Rio de Janeiro, Brasil, amostrados ao longo de um gradiente de eutrofização, que se refletiu na qualidade física dos sedimentos e na distribuição de carbono orgânico total (COT). Sedimentos da área oeste da baía foram fortemente afetados por aportes de efluentes domésticos e industriais, apresentando concentrações de Hg de até 7500 ng g -1 e inventários de Hg de até 786 mg m ). Uma mudança de uma relação negativa para uma positiva entre Hg e COT ocorreu no estuário mais eutrofizado, no qual um aumento nos níveis de Hg no sentido do topo foi observado. Este aumento pode ser atribuído a (i) um crescente aporte fluvial de Hg e (ii) um impacto da eutrofização sobre a qualidade dos sedimentos, que pode aumentar a sua capacidade de acumular Hg associado à matéria orgânica.The accumulation of Hg was investigated in sediment cores from Guanabara Bay, Rio de Janeiro, Brazil, sampled along an eutrophication gradient, which was reflected in the sediment physical quality and total organic carbon (TOC) distribution. Sediments from the western bay ). A shift from a negative to a positive relationship between Hg and TOC occurred in the most eutrophicated estuary, in which an upward increase in the recorded Hg levels was observed. This increase may be attributed to (i) an increasing riverine Hg input and (ii) an impact of eutrophication on the sediment quality, which may enhance the sediment capacity to accumulate organic matter-bound Hg.

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Mercury flux to estuarine sediments, derived from Pb-210 and Cs-137 geochronologies (Guaratuba Bay, Brazil)

Cited by 79 publications

References 13 publications

A historical evaluation of anthropogenic impact in coastal ecosystems by geochemical signatures

A historical evaluation of anthropogenic impact in coastal ecosystems by geochemical signatures

210Pb-derived Sedimentation Rates and Corg Fluxes in Soledad Lagoon (Cispatá Lagoon System, NW Caribbean Coast of Colombia)

Mercury accumulation in sediments along an eutrophication gradient in Guanabara Bay, southeast Brazil

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