Key parameters influencing metallic element mobility associated with sediments in a daily-managed reservoir

Frémion, Franck; Mourier, Brice; Courtin-Nomade, Alexandra; Lenain, Jean-François; Annouri, Amal; Fondanèche, Patrice; Hak, Thierry; Bordas, François

doi:10.1016/j.scitotenv.2017.06.236

Cited by 22 publications

(18 citation statements)

References 36 publications

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“…For the marine sediments, the release of metals is very sensitive to pH variation (Chatain et al, 2013b;Calmano et al, 1993;Frémion et al, 2017). The leaching test in weathering cells showed that the pH of the leachates of the two sediments is neutral.…”

Section: Discussionmentioning

confidence: 99%

Characterization of how contaminants arise in a dredged marine sediment and analysis of the effect of natural weathering

Couvidat

Chatain

Bouzahzah

et al. 2018

Science of The Total Environment

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Millions of tons of contaminated sediments are dredged each year from the main harbors in France. When removed from water, these sediments are very reactive, therefore their geochemical behavior must be understood in order to avoid dispersion of contaminated lixiviates in the surrounding soils. In this objective, it is necessary to evaluate the principal physicochemical parameters, and also achieve advanced mineralogical characterization. These studied sediments are highly contaminated by metals, notably copper (1445 and 835mg/kg, in the unweathered and naturally-weathered sediments, respectively), lead (760 and 1260mg/kg, respectively), zinc (2085 and 2550mg/kg, respectively), as well as by organic contaminants (PAH, PCB) and organometallics (organotins). A high concentration of sulfide minerals was also observed both in the unweathered sediment preserved under water (3.4wt% of pyrite especially), and in the naturally weathered sediment (2wt% pyrite), and in particular framboïdal pyrite was observed in the two materials. The presence of reactive mineral species in the naturally-weathered sediment can be explained by the deposit of a protective layer, composed of sulfide and their oxidation products (sulfate and iron oxides), thus preventing oxygen from diffusing through to the sulfide minerals. Additionally, the presence of aluminosilicates aggregates coating the sulfide minerals could also explain their presence in the naturally-weathered sediment. As organic matter is one of the principal constituents of the sediments (5.8 and 6.3wt% total organic carbon in the unweathered and weathered sediment, respectively), the aggregates are probably partially constituted of refractory humic material. It therefore appears that the natural weathering has led to a significant decrease in PAHs and organotins, but not in PCBs. The evolution of the granulometric structure and the distribution of the metallic contaminants could therefore lead us to consider a treatment by size separation, and a possible valorization of the dredged sediments in civil engineering.

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Section: Discussionmentioning

confidence: 99%

Characterization of how contaminants arise in a dredged marine sediment and analysis of the effect of natural weathering

Couvidat

Chatain

Bouzahzah

et al. 2018

Science of The Total Environment

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“…A 10:1 ratio (w/w) of water to dry sediment was examined according to Yu and Rinklebe (2011). Also, wet sediment was used in the microcosm experiments because the drying process would change the redox potential (Frémion et al, 2017;Kelderman and Osman, 2007). The vessel was wrapped with aluminum foil to protect algae growth and photo-oxidation (Rinklebe et al, 2016).…”

Section: Redox Experimentsmentioning

confidence: 99%

Redox-induced Mobilization of Rare Earth Elements in Musa Estuary Sediment, Southwest of Iran

Madadi¹,

Saeedi²,

Karbassi³

2021

Preprint

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In aquatic environments, metals tend to sink into sedimentary beds, but under different redox conditions they might be released to the water column. Oxic and anoxic microcosm experiments were conducted using an automatic microcosm apparatus to investigate how redox potential (Eh) affects the release of rare earth elements (REEs) in an estuary sediment sample. Results indicated that REEs mobility increases in both oxic and anoxic conditions although the average amount of REEs mobilization was higher in oxic conditions than anoxic conditions. Lu and Sm were the most mobile elements while Ce showed the lowest amount of release. REEs release is influenced by a mix of controlling factors including dissolution of Fe-Mn oxyhydroxides, low pH condition, and increase in dissolved organic carbon (DOC) under anoxic condition. An increase in Eh caused a decreasing pH from 8.08 to 6.80 and increasing DOC from 18.93 to 425 mg/l which resulted in the release of REEs. Enrichment factors (EFs) revealed that Musa estuary is threatened with Ce, Dy, La, Nd, Pr, and Sm. The high ecotoxicology effects of soluble REEs calling for potential environmental risks in Musa estuary.

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“…The pH values were adjusted to neutral condition (7.0 ± 0.5). All of the experimentally sealed glass bottles (100 mL) were intensively shaken at 180 r min −1 for 14 days (Frémion et al 2017). At the end of the experiments, the mixed samples were centrifuged at 8000 g for 15 min and filtered by 0.2-μm Nylon filters (Shanghai Xin Ya Purification Equipment CO., LTD, China).…”

Section: Influence Of Changing Physicochemical Conditionsmentioning

confidence: 99%

“…So, to obtain a comprehensive insight into the impacts of water submergence on metal(loid) solubilization in riparian soils, an indispensable methodological approach should be conducted through independent laboratory sequential extractions and solubilization tests under the different SSC, pH, and ORP conditions as well as drought-wetting cycles. Previous studies have demonstrated that changed hydrodynamic conditions regulated by dam operation can facilitate the solubilization and release of metal(loid)s from sediments to overlying water column, especially for those non-residual metal(loid)s derived from human activities (Frémion et al 2016(Frémion et al , 2017. Thus, in this study, we hypothesized that the disturbed physicochemical factors after water submergence within reservoirs would increase the solubilization of metal(loid)s from riparian soils based on the laboratory solubilization tests.…”

Section: Introductionmentioning

confidence: 96%

“…Water submergence in riparian soils within reservoirs largely modifies the micro-environments of the soil-water interface (Sun et al 2018). Actually, in a dam-reservoir context, increased frequency of high-intensity flood events and water level fluctuation could generate similar alterations in physicochemical conditions, especially during the water release and intake stages in daily regulated reservoirs (Frémion et al 2017;Chen et al 2020). The re-suspension of riparian soils, continuous cycles of drought-wetting processes, and rapid changes of water environments (e.g., suspended solid concentration (SSC), acid-alkaline property (pH), and oxidationreduction potential (ORP)) could notably influence the evolution of metal(loid) mobility (Larner et al 2008;Pareuil et al 2008;Du Laing et al 2009;Lin et al 2018).…”

Section: Introductionmentioning

confidence: 99%

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Spatial distribution and solubilization characteristics of metal(loid)s in riparian soils within reservoirs along the middle Jinsha River

et al. 2021

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Purpose The construction of large dams submerges riparian soils within reservoirs. However, little is known about the influence of water submergence on metal(loid) solubilization from polluted soils. In this study, the spatial distribution and solubilization characteristics of soil-associated metal(loid)s within reservoirs along the middle Jinsha River were evaluated. Methods Concentrations of soil-associated metal(loid)s were determined and principal component analysis was performed to evaluate the metal(loid) spatial distribution. Then, metal(loid) chemical fractions of highly contaminated soils were analyzed. Finally, ex situ experiments of metal(loid) solubilization were conducted under the influence of changing pH, suspended solid concentration (SSC), and oxidation-reduction potential (ORP) conditions as well as successive drought-wetting cycles. Results Within the LY, AH, and LKK reservoirs, the soil-associated Ni and Cr originated from specific metal(loid) ores, and Cd and Cu remained from historical industrial pollution posed potential risks to water quality. Water submergence changed pH, SSC, and ORP conditions, which affected metal(loid) solubilization through dissolution-precipitation and sorption-desorption processes. The low SSC variables contributed to over 20% solubilization of total Cd, Cu, and As. Moreover, the neutral-alkaline conditions due to carbonate-dominated lithology limited metal(loid) release from soils. Finally, the decreased ORP promoted solubilization of metal(loid)s bound to Fe-Mn oxyhydroxides. Generally, the solubilization levels of metal(loid)s were dependent on the chemical fractions.Conclusion Water submergence could induce potential solubilization of metal(loid)s, especially for Cd from historical industrial pollution. Thus, this study highlighted that the investigation on both spatial distribution and solubilization characteristics of metal(loid)s in riparian soils is important for future environmental management of reservoirs.

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Key parameters influencing metallic element mobility associated with sediments in a daily-managed reservoir

Cited by 22 publications

References 36 publications

Characterization of how contaminants arise in a dredged marine sediment and analysis of the effect of natural weathering

Characterization of how contaminants arise in a dredged marine sediment and analysis of the effect of natural weathering

Redox-induced Mobilization of Rare Earth Elements in Musa Estuary Sediment, Southwest of Iran

Spatial distribution and solubilization characteristics of metal(loid)s in riparian soils within reservoirs along the middle Jinsha River

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