Heavy metal assessment for surface sediments from three areas of the Portuguese continental shelf

Mil-Homens, Mário; Stevens, Rodney L.; Abrantes, Fatima F; Cato, Ingemar

doi:10.1016/j.csr.2006.04.002

Cited by 87 publications

(21 citation statements)

References 50 publications

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“…The amount of Hg in skeletons of living organisms usually is reported as concentration ratios to Ca (in order to account for variable rates of skeletal growth) or as enrichment factors (EFs) (e.g., Luoma, 1989). Traditionally, EFs have been widely used in pollution studies of marine sediments because they allow discrimination between the natural input of elements and that produced by human activities (Kehrig et al, 2003;Mil-Homes et al, 2006). Golfo Triste, located on the western coast of Venezuela, is one of the most productive artisanal and industrial fishing grounds of the country, particularly because of its shrimp and snapper trawling industry (Molinet et al, 1991).…”

Section: Introductionmentioning

confidence: 99%

Chronology of mercury enrichment factors in reef corals from western Venezuela

Ramos

Cipriani

Guzmán

et al. 2009

Marine Pollution Bulletin

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Section: Introductionmentioning

confidence: 99%

Chronology of mercury enrichment factors in reef corals from western Venezuela

Ramos

Cipriani

Guzmán

et al. 2009

Marine Pollution Bulletin

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“…[95][96][97] Cd was the only non-enriched element (EF ≤ 1), and Pb and Cu were enriched (1 < EF < 2) at all three stations. Mn, Cr and Zn were highly enriched (EF ≥ 2) only at the estuarine confluence, whereas As was also enriched at the confluence but did not exceed its natural value (EF ≤ 2) ( Figure 5).…”

Section: Geochemical Indicesmentioning

confidence: 92%

Geoquímica do material particulado em suspensão em um sistema estuarino tropical, sudeste do Brasil

Monteiro¹,

Sá²,

Neto³

2017

Quim. Nova

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The aim of this study is to assess the variation of the geochemistry of suspended particulate matter (SPM) in the tropical estuarine system composed of the adjacent Piraquê-Açu and Piraquê-Mirim (ES) rivers using SPM sampled with sediment traps (45 µm mesh) installed in the drainage channels. We collected SPM during different tidal stages and seasonal periods and analysed the metals using inductively coupled plasma mass spectrometry according to EPA 3051A, the mineralogy using X-ray diffraction, the particle size using laser ray diffraction, and organic matter (OM) using calcination. The traps collected enough SPM to perform analyses for each sampling period. The SPM consists of silt size particles, and the percentage of OM is between 20 and 40%. The particles are dominated by kaolinite and quartz, and gibbsite, haematite, goethite, and pyrite are also present. These materials are found in the Barreiras Formation, through which the drainage system cuts. The metal concentrations were higher in the summer: Al (3208.32 g kg ). The Piraquê-Açu River had higher metal concentrations than the Piraquê-Mirim River, and the geochemical indices of both rivers indicate that they naturally contribute to the estuarine system of the Piraquê-Açu and Piraquê-Mirim rivers (SEPAPM). However, anthropic interferences influence these indices at the confluence of the two channels.Keywords: sediment trap; metals; mineralogy; Piraquê-Açu. INTRODUCTIONEstuaries are transitional environments that act as biogeochemical filters that retain dissolved and particulate material, including pollutants.1-4 Because they are largely influenced by hydrodynamic processes (waves, currents, and tides), estuaries distribute these elements and determine whether the system is a retainer or an exporter.5 Several studies have addressed the chemical composition and transport of suspended particulate matter (SPM; ≥ 0.45 µm) from estuarine regions to the adjacent coastal zones, mainly to quantify the continental contribution to the oceans. [6][7][8][9][10][11] However, few studies have been conducted in estuaries located in small and medium river basins in tropical regions, especially in those where human impacts are not yet evident. Understanding the geochemistry of SPM and the processes that influence it in estuarine systems has become a challenge when considering conditioning parameters such as rainfall, river discharge, the concentrations of major and trace elements and the physicochemical variables that may modify the geochemical behaviour of the SPM.To address these issues, the estuarine system of the Piraquê-Açu and Piraquê-Mirim rivers (SEPAPM) was studied to 1) evaluate if the geochemistry of the SPM of these two adjacent fluvial channels with different drainages varies 12,13 and 2) test if a sediment trap can be used to collect SPM considering the difficulty of sampling SPM with conventional methods, which require filtering many litres of water to acquire sufficient material for the geochemical analysis. Study areaThe SEPAPM is located in the municipa...

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“…The enrichment factor (EF) for heavy metals has been widely used to assess human contamination [15,16]. It was calculated by using the modified formula proposed by Glasby et al [17]:…”

Section: Multivariate Analysis Methodsmentioning

confidence: 99%

“…Generally speaking, the varimax loadings > 0.71 are commonly regarded as excellent, while < 0.32 is very poor [32]. Furthermore, all principal factors extracted from the variables were retained with eigenvalues < 1.0 [16]. The results of the PCA analyses of heavy metals in sediment cores from the riverine wetland showed that two components accounted for about 98.5% of the total variance in the data matrix.…”

Section: Enrichment Factors and Pca Analysismentioning

confidence: 99%

Ecological Risk Assessment Of Heavy Metals In Sediments Of A Riverine Wetland, Huaihe River Watershed, China

Yuan

Pan

Zhu

et al. 2015

Ecological Chemistry and Engineering S

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Abstract:The concentrations of Zn, Cr, Cu, As, Cd, and Pb in sediment cores collected from a representative riverine wetland located in the Huaihe River watershed, China, dramaticlly increased from the bottom to upper layer of the cores. Application of principal component analysis (PCA) and enrichment factor (EF) suggested that heavy metals might primarily have been derived from the inflow of contaminated water from an industrial park and agricultural region. Component 1 of the PCA was dominated by Zn, Cr, Cu, Cd, and Pb, while Component 2 was dominated by As. Metals' high concentrations and EF values showed that the anthropogenic pollutants have increased sharply in recent years and reflect the continuous development of industry and agriculture in the region of the wetland, with a corresponding dramatic deterioration of the environment due to constant effluent of pollutants. Cd exerted the highest potential ecological risk of individual metals of sediment cores. Additionally, integrated RI values for all metals indicated that sediments possessed low ecological risk from the bottom to about 6 cm depth of the cores, moderate ecological risk from about 5 cm depth upwards, then considerable ecological risk from 4 cm depth to the top layer of the sediment cores, which demonstrates a continuous deterioration of environmental quality in recent years in this region.

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Heavy metal assessment for surface sediments from three areas of the Portuguese continental shelf

Cited by 87 publications

References 50 publications

Chronology of mercury enrichment factors in reef corals from western Venezuela

Chronology of mercury enrichment factors in reef corals from western Venezuela

Geoquímica do material particulado em suspensão em um sistema estuarino tropical, sudeste do Brasil

Ecological Risk Assessment Of Heavy Metals In Sediments Of A Riverine Wetland, Huaihe River Watershed, China

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