Sources and distribution of yttrium and rare earth elements in surface sediments from Tagus estuary, Portugal

Brito, Pedro; Prego, Ricardo; Mil-Homens, Mário; Caçador, Isabel; Caetano, Miguel

doi:10.1016/j.scitotenv.2017.11.245

Cited by 74 publications

(33 citation statements)

References 72 publications

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“…With the variables of LREEs presenting strong spatial dependence, we concluded that the LREEs in the soil were affected mainly by natural factors. Moderate spatial dependence indicates that anthropogenic factors changed the soil texture spatial correlation through activities such as farming, management, practices, industrial production, and other human activities [46,47]. The 9 HREEs, except for Gd, presented moderate spatial dependence, which indicates that HREEs were more affected by anthropogenic factors than LREEs.…”

Section: Resultsmentioning

confidence: 99%

Rare earth elements in paddy fields from eroded granite hilly land in a southern China watershed

Chen

et al. 2019

PLoS ONE

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There are large amounts of ion-adsorption rare earth resources in the granite red soil region of southern China, and exploitation of rare earth elements (REEs) has caused serious soil erosion and soil pollution in the area. In this study, the spatial variability of soil REEs in Zhuxi watershed, Changting County, southern China, was analyzed using a geostatistics method. The analysis produced several important results: (1) The content of total rare earth elements (TREEs) in the soil samples ranged from 56.04 to 951.76 mg kg−1, with a mean value of 255.34 mg kg−1, which was higher than the background value of soil in China. The REE variables showed strong positive Ce anomalies and strong negative Eu anomalies, with mean values of 2.26 and 0.44, respectively. (2) The contents of TREEs in five subtypes of the soils were different, but they had broadly similar curves of chondrite-normalized REE patterns, with steeper patterns from La to Eu and flatter patterns from Eu to Y. (3) The spatial variability of light rare earth elements (LREEs) was mainly affected by natural factors, but the spatial variabilities of heavy rare earth elements (HREEs) and TREEs were influenced by the combination of natural factors and anthropogenic factors. Soil erosion can contribute significantly to REE migration, especially for HREEs. (4) The distribution of TREEs showed that the high content of TREEs was in the lowland of the western watershed. By comparing the distributions of TREEs in paddy fields and hilly land, we found that the area with a high content of TREEs was greater in paddy fields than in hilly land, so we deduced that REEs migrate from hilly land to the paddy field and accumulate in the soil there.

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Section: Resultsmentioning

confidence: 99%

Rare earth elements in paddy fields from eroded granite hilly land in a southern China watershed

Chen

et al. 2019

PLoS ONE

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“…However, as already mentioned, a potential anthropogenic contribution cannot be excluded for MG and M2, consistent with other metals (Benabdelkader et al, 2018) . This fractionation demonstrated by the higher positive ratios (La/Yb)n and (Sm/Yb)n with high flow, might illustrate the progressive contribution of intermediate and felsic rocks by erosion processes (McLennan, 1989;Ramesh et al, 1999;Brito et al, 2018). Nevertheless, the slight depletion of HREE in sediments would also result in their greater tendency to form stable soluble complexes than LREE and MREE, and thus to be preferentially transported in overlying water instead of accumulating in the sediments (Fleet, 1984;Millero, 1992;Kuss et al, 2001;Sappal et al, 2014).…”

Section: Role Of Hydrology and Erosionmentioning

confidence: 96%

“…The proportion of extractable LREE varied (0-13%), with Nd being the most extractable element (13%) in T3, except Ce in M2, and La the and MREE enrichments were rather homogenous and not very high, which argued for a main natural weathering origin (McLennan and Taylor, 2012). However, the strongest LREE and MREE enrichment for some stations might not exclude a contribution by local pollution (Borrego et al, 2004;Brito et al, 2018). An MREE enrichment has also been observed in a case of acid mine drainage contribution (Delgado et al, 2012).…”

Section: Edta Extractable Fraction Of Reementioning

confidence: 97%

Origin, distribution, and behaviour of rare earth elements in river bed sediments from a carbonate semi-arid basin (Tafna River, Algeria)

Benabdelkader

Taleb

Probst

et al. 2019

Applied Geochemistry

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A B S T R A C TThe behaviour and sources of rare earth elements (REE) in river sediments were investigated at ten stations and two dams of the Tafna basin (Northern Algeria) during contrasting hydrological conditions and using a combination of normalisation procedures, REE anomalies, various REE ratios, and multivariate statistical analysis. The ranking and REE concentrations were in the range of other carbonated areas. The classical fractionation of the heavy REE(HREE) erosion pattern, evidenced from upstream to downstream by the La/Yb or Sm/Yb ratios, was disturbed by the presence of dams, which retained the light REE (LREE) in particular. The hydrological conditions, particle size, and geochemical characteristics controlled the REE patterns. The LREE were associated with clay minerals and HREE with coarse silts, whereas carbonate and particulate organic carbon (POC) did not influence the transport downstream. The total concentration of REE in sediments was not strongly affected by anthropogenic inputs from various sources (industrial activities, and domestic or medical wastes). Indeed, some LREE enrichment and anomalies were detected at a few stations and locally for Gd, Tb, and Yb. However, the anthropogenic contribution can partially be hidden by dilution due to particle erosion. High flow increased the LREE and MREE enrichment and LREE/HREE fractionation in some places due to erosion processes and anthropic influences (dam releases and local wastes inputs). Middle REE (MREE) and HREE were the most extractable elements unlike LREE (which are the most concentrated), particularly during high water conditions. Finally, the REE demonstrated the impact of natural processes (hydrological, geochemical, and physical) and some anthropogenic disturbances (waste inputs, fertilisers, and dams). This might inspire to develop such investigations in other similar semi-arid basins undergoing various pressures. The use of local bedrock as a reference and a set of geochemical and statistical tools, is recommended.

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“…Rare earth elements (REE) and neodymium (Nd) isotopes in river sediment and suspended material are generally assumed to faithfully reflect the composition of their source rocks (e.g., Goldstein and Jacobsen, 1988a;McLennan, 1989;Bayon et al, 2015). Correspondingly, this assumption has led to the widespread application of the REE and Nd isotopes as provenance proxies in various environmental studies (e.g., Goldstein and Hemming, 2003), but also as emerging tracers for anthropogenic pollution sources (e.g., Kulaksiz and Bau, 2013;Brito et al, 2018;Trifuoggi et al, 2018;Xu et al, 2018). However, it is now increasingly recognized that both weathering and transport processes can also lead to significant decoupling of Nd isotopes in rivers between different grainsize fractions (McLennan et al, 1989;Andersson et al, 2001;Garçon and Chauvel, 2014;Bayon et al, 2015;Merschel et al, 2017;Jonell et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Preferential Riverine Export of Fine Volcanogenic Particles to the Southeast Australian Margin

et al. 2020

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We report on rare earth element and neodymium isotopic compositions in a series of grain-size fractions separated from river suspended matter in the Murray-Darling Basin (MDB) and a nearby marine sediment core (MD03-2607) offshore southeastern Australia. This source-to-sink approach was used to further investigate the extent to which sediment sorting may control the geochemistry of suspended loads in rivers, and to provide constraints on the source of the detrital sediment material exported to the ocean. Our results provide further compelling evidence that significant sizedependent geochemical decoupling can occur in river systems, accounting here for Nd isotopic (ε Nd) differences of up to eight epsilon-units between silt (>25 µm) and colloidal (0.2−0.006 µm; 0.006−0.003 µm) fractions. All suspended particulate samples from the River Murray watershed display a trend toward more radiogenic (higher ε Nd) Nd signatures with decreasing grain-size, in addition to differing REE signatures, which collectively point toward a preferential volcanogenic origin for the fine-grained inorganic particles transported by MDB rivers. Furthermore, we show that the same river-borne volcanogenic material dominates in the fine-grained detrital fractions extracted from core MD03-2607 at the southeastern Australian margin; a finding corroborated by REE signatures in a series of copepod fecal pellet separates from the same core. Collectively, our results suggest that river sediment discharge is accompanied by preferential export of fine-grained volcanogenic particles to the ocean. This potential source of bioavailable trace metals and nutrients in ocean surface waters could impact marine productivity.

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Sources and distribution of yttrium and rare earth elements in surface sediments from Tagus estuary, Portugal

Cited by 74 publications

References 72 publications

Rare earth elements in paddy fields from eroded granite hilly land in a southern China watershed

Rare earth elements in paddy fields from eroded granite hilly land in a southern China watershed

Origin, distribution, and behaviour of rare earth elements in river bed sediments from a carbonate semi-arid basin (Tafna River, Algeria)

Preferential Riverine Export of Fine Volcanogenic Particles to the Southeast Australian Margin

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