Determination of background geochemistry of an Amazon estuary: The Cuñaní Estuary – Amapá

Xavier, Diego de Arruda; Santos, Valdenira Ferreira dos; Miranda, Artur Gustavo Oliveira de; Berrêdo, José Francisco

doi:10.1016/j.marpolbul.2020.111144

Cited by 13 publications

(11 citation statements)

References 18 publications

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“…Cobalt values assessed were also indicative of some degree of contamination. However, the highest concentrations recorded by our study (2.87 and 3.53 µg/g DW) are lower than those recorded in a nearby estuary (13.82 µg/g DW: Xavier et al, 2020).…”

Section: Ratio Between the Recorded Levels And The Earth Crust's Levelscontrasting

confidence: 89%

“…In beaches from the coast of Spain, values of Hg were higher than in the present study and attributed to local environmental characteristics (Sanz-Prada et al, 2020). The studies carried out in areas closer to ours, a nearby estuary (Xavier et al, 2020) and continental shelf (Siqueira et al, 2018), had similar Hg values. There are, indeed, gold mining activities in surrounding upstream areas, but the scale of these activities and the amount of mercury they generate would hardly influence the adjacent continental shelf in a similar way.…”

Section: Ratio Between the Recorded Levels And The Earth Crust's Levelssupporting

confidence: 54%

“…There are, indeed, gold mining activities in surrounding upstream areas, but the scale of these activities and the amount of mercury they generate would hardly influence the adjacent continental shelf in a similar way. There are also other environmental particularities, such as soil type (Roulet and Lucotte, 1995), intense fluvial discharge of organic matter (Anthony et al, 2013;Siqueira et al, 2018), and mining activity (Lacerda and Pfeiffer, 1992;Siqueira et al, 2018) that may affect the levels of Hg in Amazonian soils (Marchand et al, 2006;Siqueira et al, 2018;Xavier et al, 2020). Seasonal analyses that quantify the different forms of this element are necessary to answer properly the questions about Hg source and environmental risk (Lacerda and Pfeiffer, 1992;Siqueira et al, 2018).…”

Section: Ratio Between the Recorded Levels And The Earth Crust's Levelsmentioning

confidence: 99%

“…There are only two studies on the sediment characteristics for this entire west ACZ: one that evaluated mercury concentrations on the continental shelf (Siqueira et al, 2018) and another one that evaluated 23 elements in the estuary of the Cunani River (Xavier et al, 2020). To fill this knowledge gap for such a vast and peculiar region, this study aimed to establish a baseline of the trace elements profile and concentrations, including metals and metalloids in the intertidal sediments of sandy beaches north to the Amazon river mouth.…”

Section: Introductionmentioning

confidence: 99%

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Baseline Study of Trace Element Concentrations in Sediments of the Intertidal Zone of Amazonian Oceanic Beaches

et al. 2021

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Analyzing the presence and quantifying trace elements is of paramount importance to understand natural environmental processes and monitor the degree of anthropogenic disturbance to mitigate impacts already caused. Here, we aimed to establish a baseline of the trace elements profile and concentrations in sandy sediments of intertidal areas of three Amazonian beaches (Brazil). For each beach, sediments were collected from three different sectors (south, center, and north) and five shoreline distance levels (from the high- to the low-water mark), totalizing 15 samples per beach. The concentration of the different trace elements (Mg, Al, P, S, Ca, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, As, Br, Rb, Sr, Y, Zr, Cd, Sn, I, Hg, and Pb) was determined by Total reflection X-ray Fluorescence spectrometry. Sediment was also characterized for its grain size, organic matter, and pH. To assess possible enrichment due to anthropogenic activities we compared trace element levels with the values for the Earth’s crust and calculated pollution indexes: geoaccumulation index (Igeo), ecological risk index (RI), contamination factor (CF), pollution load index (PLI), and sediment quality guideline (SQG), threshold effects level (TEL) and probable effects level (PEL). Individual trace metal concentrations did not vary significantly between beaches, sectors, or sample levels, evidencing a homogeneity of trace elements composition and concentrations across this environment. Igeo indicated 62.2% of the sampling stations uncontaminated, 20.0% from uncontaminated to moderately contaminated, and 4.44% (two sampling stations) strongly contaminated, the same two areas classified as high ecological risk by RI. Most of the sampling points presented low CF. Cadmium and Hg were the only elements that showed moderate to very high values of CF. According to the SQGs, 77.7 and 8.8% of the sampling points presented values above the moderate threshold effect level (SQG-TEL) and probable effect level (SQG-PEL), respectively. All points were classified as non-polluted according to the PLI. Our results show that the three beaches present safe levels of almost of the elements demonstrating the good state of preservation. Most of the indexes classified the sampling points as non-polluted, except for Cd and Hg in a few specific sampling points.

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Section: Ratio Between the Recorded Levels And The Earth Crust's Levelscontrasting

confidence: 89%

Section: Ratio Between the Recorded Levels And The Earth Crust's Levelssupporting

confidence: 54%

Section: Ratio Between the Recorded Levels And The Earth Crust's Levelsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Baseline Study of Trace Element Concentrations in Sediments of the Intertidal Zone of Amazonian Oceanic Beaches

et al. 2021

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“…The biogeochemical cycle of V has recently been largely influenced by anthropogenic activity [2]. Xavier et al (2020) established moderate contamination for V in the sediment samples of Cuñaní Estuary [15]. Furthermore, Ribeiro et al (2018) determined V to be present as the 7th most abundant trace metal in Douro River estuary and established strong contamination by the anthropogenic activity [16].…”

Section: Introductionmentioning

confidence: 99%

Redox Speciation of Vanadium in Estuarine Waters Using Improved Methodology Based on Anion Exchange Chromatography Coupled to HR ICP-MS System

et al. 2021

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An improved methodology was developed for V redox speciation in estuarine waters using a hyphenated technique consisting of ion chromatograph (IC) with an anion exchange column and a high-resolution inductively coupled plasma mass spectrometer (HR ICP-MS). This approach enables the direct determination of V(V), whereas reduced species (mainly V(IV)) are calculated by subtracting V(V) concentrations from the measured total V concentration. Based on the “on-column” V(V) chelation mechanism by EDTA, with the eluent composed of 40 mmol L−1 ammonium bicarbonate, 40 mmol L−1 ammonium sulphate, 8 mmol L−1 ethylenediaminetetraacetic acid and 3% acetonitrile, the method was successfully used for analyses of V redox speciation in samples taken in the vertical salinity gradient of the highly stratified Krka River estuary. Due to the matrix effects causing different sensitivities, a standard addition method was used for V(V) quantification purposes. The limit of detection (LOD) was also found to be matrix related: 101.68 ng L−1 in the seawater and 30.56 µg L−1 in the freshwater. Performed stability tests showed that V redox speciation is preserved at least 7 days in un-treated samples, possibly due to the stabilization of V-reduced species with natural organic matter (NOM). The dominant V form in the analysed samples was V(V) with the reduced V(IV) accounting for up to 26% of the total dissolved pool. The concentration of V(IV) was found to correlate negatively with the oxygen concentration. Significant removal of dissolved V was detected in oxygen depleted zones possibly related to the particle scavenging.

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Trace element fluxes during the “Anthropocene” in a large South American industrial and port area (Santos and São Vicente estuarine system, SE, Brazil)

Angeli

Sartoretto

Kim

et al. 2021

Environ Monit Assess

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Determination of background geochemistry of an Amazon estuary: The Cuñaní Estuary – Amapá

Cited by 13 publications

References 18 publications

Baseline Study of Trace Element Concentrations in Sediments of the Intertidal Zone of Amazonian Oceanic Beaches

Baseline Study of Trace Element Concentrations in Sediments of the Intertidal Zone of Amazonian Oceanic Beaches

Redox Speciation of Vanadium in Estuarine Waters Using Improved Methodology Based on Anion Exchange Chromatography Coupled to HR ICP-MS System

Trace element fluxes during the “Anthropocene” in a large South American industrial and port area (Santos and São Vicente estuarine system, SE, Brazil)

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