Spatial distribution of some trace and major elements in sediments of the Cávado estuary (Esposende, Portugal)

Gredilla, Ainara; Stoichev, Teodor; Vallejuelo, Silvia Fdez‐Ortiz de; Rodriguez-Iruretagoiena, Azibar; Morais, Paulo de; Arana, Gorka; Diego, Alberto de; Madariaga, Juan Manuel

doi:10.1016/j.marpolbul.2015.07.040

Cited by 17 publications

(18 citation statements)

References 18 publications

(33 reference statements)

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“…For the sediment collection, 3 sampling points within 5 m*5 m of each other were repeatedly sampled at each sampling site, and approximately 300 g of sediment was collected at every point. The samples were mixed uniformly, numbered, sealed and placed into zip lock bags in an ice-box, and transferred back to the laboratory [ 14 ]. Because underwater sampling should proceed in a stable and careful manner to avoid stirring the sediments, our motions during sampling were slow and controlled.…”

Section: Methodsmentioning

confidence: 99%

“…Meanwhile, it is widely considered that lake sediments are the secondary pollution source restricting the water quality [ 11 , 12 ]. Because heavy metals cannot be purified by the self-purification capacity of water, they are constantly deposited and accumulated into sediments, causing the lake sediments to become a considerable sink for anthropogenic heavy metal emissions [ 13 , 14 ]. However, heavy metals in the sediments were not stable, and with the change in the physical and chemical properties of water, heavy metals could again release and contaminate the overlying water, thus posing a great threat to human health via biological accumulation and the food chain [ 15 , 16 ].…”

Section: Introductionmentioning

confidence: 99%

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Assessment of the distribution, bioavailability and ecological risks of heavy metals in the lake water and surface sediments of the Caohai plateau wetland, China

Zhou

et al. 2017

PLoS ONE

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In this study, selected heavy metals (Hg, As, Cd, Pb, Cr, Cu and Zn) in the lake water and sediments from the Caohai wetland, which is a valuable state reserve for migrant birds in China, were investigated to assess the spatial distribution, sources, bioavailability and ecological risks. The results suggested that most of the higher concentrations were found in the eastern region of the lakeshore. The concentration factor (CF) revealed that Hg, Cd and Zn were present from moderate risk levels to considerable risk levels in this study; thus, based on the high pollution load index (PLI) values, the Caohai wetland can be considered polluted. According to the associated effects-range classification, Cd may present substantial environmental hazards. An investigation of the chemical speciation suggested that Cd and Zn were unstable across most of the sites, which implied a higher risk of quick desorption and release. Principal component analysis (PCA) indicated that the heavy metal contamination originated from both natural and anthropogenic sources.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Assessment of the distribution, bioavailability and ecological risks of heavy metals in the lake water and surface sediments of the Caohai plateau wetland, China

Zhou

et al. 2017

PLoS ONE

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“…Las elevadas correlaciones del Fe 2 O 3 y MgO con el Al 2 O 3 sugiere el probable origen litogénico de la mayoría de elementos mayores estudiados debido a su asociación con las fases sólidas de aluminosilicatos [58,59]. Los óxidos de aluminio pueden retener elementos porque proveen sitios de adsorción en función del pH [50].…”

Section: Aluminio Y Hierrounclassified

“…Mientras que las mayores concentraciones de Mg se registraron en el río Esmeraldas (17 mg g −1 ), y las concentraciones más bajas en el río Rumiyacu (4 mg g −1 ). De manera general, el Mg tiende a encontrarse en mayores concentraciones en sitios cercanos a la desembocadura del río [58]. Elevadas concentraciones de Mg en los ríos Amazónicos puede atribuirse a la presencia de rocas carbonáticas, o al vertido de aguas de forma-ción [31].…”

Section: Magnesio Y Manganesounclassified

Determinación de elementos mayores en sedimentos provenientes de zonas afectadas por actividades petroleras en Ecuador

Naranjo

Maurice

Ochoa‐Herrera

et al. 2015

Av. Cienc. Ing. (Quito)

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* g −1 . Mientras que las concentraciones en el bulk de los sedimentos fueron , Na: 3-24 y Mn: 0.43-1.28 mg g −1 . En las muestras analizadas, el 43 % del Na, el 93 % del Fe, el 70 % de Mg, el 62 % de Mn y el 94 % de K están asociados con la fracción fina de los sedimentos. Las concentraciones de Mg, Na y Mn están influenciadas por las actividades petroleras mientras que el contenido de Fe, K y Al está relacionado con el origen natural de los sedimentos. Sin embargo, aguas abajo, hasta la frontera con Perú, no se observa un incremento significativo en las concentraciones de elementos mayores en relación a los puntos de control, aguas arriba de la ZIL, Zona de Influencia Local de las actividades petroleras. Palabras Analisis of major cations in bottom sediments from oil impacted Rivers, in the Ecuadorian Amazon AbstractHeavy metal pollution is one of the biggest problems of great concern at the global, regional and local levels due to mining and oil activities, because those elements constitute a threat to aquatic biota and human health. The major elements and heavy metals tend to accumulate in sediments, which act as secondary sources of contamination, and this process is closely related to the redox conditions, the particle size distribution of the sediments and the amount of sedimentary organic matter. Therefore, the aim of this work conducted in the frame of the MONOIL Research Program between France and Ecuador, is to determine the concentration of major elements (K, Mg, Na, Fe, Mn and Al) in the fine fraction of sediments, particles <4 µm, collected in the basins of the Aguarico, Napo and Esmeraldas Rivers, which are areas affected by the oil industry in Ecuador. Concentrations of major elements in the fine fraction are then compared to concentrations in the bulk, which was determined in the same sampling points in a previous work. Environmental parameters in surface waters such as temperature, dissolved oxygen (DO), pH, conductivity and oxide reduction potential (ORP) were determined in situ in each sampling point. The isolation of the fine fraction was carried out based on Stokes' law after a homogenization, quartering and dissolution of the sediment in distilled water. Mineralization in sediments was performed by a triacid attack with HCl, HNO3 and HF. The major elements were determined by atomic absorption spectrophotometry (AAS). The ranges of major elements in the fine fraction of sediments were: Fe: 18-49, Al: 26-59, K: 3-15, Mg: 3-13, Na: 1-11 and Mn: 0.38-0.89 mg g −1 ; while concentrations in the bulk sediment concentrations were: Fe: 25-49, Al: 45-82, K: 5-20, Mg: 4-16, Na: 3-24 and Mn: 0.43-1.28 mg g −1 . In the sediment samples of the Northern Ecuadorian Amazon rivers, 43 % Na, 93 % Fe, 70 % Mg, 62 % Mn and 94 % K are associated with the fine fraction. The concentrations of Mg, Na and Mn in bottom sediments are influenced by oil activities, while Fe, K and Al concentrations depend on the natural origin of sediments. However, downstream up to the border with Peru, no significant increase in the...

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“…To investigate the source of these trace metals, many approaches such as average shale and crust content (e.g., Al Rashdi et al, 2015;Grygar et al, 2013;Ma et al, 2016;Nerm et al, 2016) and preindustrial levels from sediment cores (e.g., Gredilla et al, 2015;Kim et al, 2016) have been used to determine the geochemical background in order to reduce natural variability. Thus, to assess trace metal contamination, it is important to use an accurate reference level, although it is well known that sediment cores are not always available, and it is difficult to use mean crust values because these values do not take into account local geological features .…”

Section: Introductionmentioning

confidence: 99%

Índice de Qualidade Ambiental para avaliação de metais e semimetais em sedimentos do Complexo Estuarino de Santos e São Vicente (SP, Brasil)

Kim¹

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To study trace metal contamination in superficial sediment samples it is necessary to distinguish the anthropogenic and lithogenic contributions. Normalization methods and environmental quality indices are applied in order to minimize the lithogenic influence and simplify the interpretation. The aim of this study is to apply environmental quality indices, using levels of metals, and evaluate their applicability on estuarine environments as Baixada Santista in which industrial, touristic activities and urbanization exert pressure on the system as a whole. Levels of metals and As were analyzed by ICP-OES and geochemical parameters as TOC, NT, mud content, δ 13 C and δ 15 N were also obtained. A total of eight indices were applied and the mud content was essential on environmental studies, since it is the main factor on controlling the natural distribution of trace metals in sediments. In general, the prevailing contamination was confined in the inner part of the estuary around Cubatão Industrial Complex and the use of indices are suitable for estuarine system studies. On sediment contamination studies, features as normalization using a background value and the grain size, gathering all levels in one showed essential. The Sediment Pollution Index considers all, being a good index to this purpose.

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Spatial distribution of some trace and major elements in sediments of the Cávado estuary (Esposende, Portugal)

Cited by 17 publications

References 18 publications

Assessment of the distribution, bioavailability and ecological risks of heavy metals in the lake water and surface sediments of the Caohai plateau wetland, China

Assessment of the distribution, bioavailability and ecological risks of heavy metals in the lake water and surface sediments of the Caohai plateau wetland, China

Determinación de elementos mayores en sedimentos provenientes de zonas afectadas por actividades petroleras en Ecuador

Índice de Qualidade Ambiental para avaliação de metais e semimetais em sedimentos do Complexo Estuarino de Santos e São Vicente (SP, Brasil)

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