Journal ArticleDOI
Distribution, speciation, and bioavailability of lanthanides in the Rhine-Meuse estuary, The Netherlands
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TLDR
In this article, the authors quantify the variation in estuarine lanthanide solid/water distribution, speciation, and bioaccumulation in the amphipod Corophium volutator under field and laboratory conditions.Abstract:
Changing environmental conditions may influence the fate and bioavailability of lanthanides (part of the rare earth elements [Ln]) in estuaries. The aim of this study was to quantify the variation in estuarine lanthanide solid/water distribution, speciation, and bioaccumulation. The latter was studied in the amphipod Corophium volutator under field and laboratory conditions. Calculations with the chemical equilibrium model MINEQL+ indicate that dissolved lanthanides are complexed mainly to carbonates and dissolved organic matter. In the water phase, the relative abundance of the free ion, LnCO3, and humic complexes decreases from lanthanum to lutetium, whereas the relative abundance of Ln(CO3)2 increases. Cerium and europium anomalies were found in the water. Europium anomalies were also found in some biota. The biota sediment accumulation factors (BSAFs) decreased across the series from lanthanum to lutetium. Regression analysis revealed that alkalinity correlated negatively with lanthanide uptake. This suggests that increasing complexation reduced bioavailability under the prevailing conditions. The BSAFs did not depend on salinity or pH, which may simplify sediment-quality criteria for fresh versus saline waters. Field BSAFs were significantly lower than laboratory values for the same sediments, which is explained by adaptation of the organisms to lanthanides.read more
Citations
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Journal ArticleDOI
Mercury and other trace elements in a pelagic Arctic marine food web (Northwater Polynya, Baffin Bay)
Linda M. Campbell,Ross J. Norstrom,Keith A. Hobson,Derek C. G. Muir,Sean Backus,Aaron T. Fisk +5 more
TL;DR: The food web behavior of THg and delta15N appears constant, regardless of trophic state (eutrophic vs. oligotrophic), latitude (Arctic vs. tropical) or salinity (marine vs. freshwater) of the ecosystem.
Journal ArticleDOI
Health effects and toxicity mechanisms of rare earth elements-Knowledge gaps and research prospects.
TL;DR: Several studies have demonstrated that REE, like a number of other xenobiotics, follow hormetic concentration-related trends, implying stimulatory or protective effects at low levels, then adverse effects at higher concentrations, and another major role for REE-associated effects should be focused on pH-dependent REE speciation and hence toxicity.
Journal ArticleDOI
PQQ-dependent methanol dehydrogenases: rare-earth elements make a difference
TL;DR: The XoxF-MDHs described thus far are homodimeric proteins lacking the small subunit and possess a rare-earth element (REE) instead of calcium.
Journal ArticleDOI
Eutrophication management in surface waters using lanthanum modified bentonite: A review.
Diego Copetti,Karin Finsterle,Laura Marziali,Fabrizio Stefani,Gianni Tartari,Grant Douglas,Kasper Reitzel,Bryan M. Spears,Ian J. Winfield,Giuseppe Crosa,Patrick C. D'Haese,Said Yasseri,Miquel Lürling +12 more
TL;DR: Application of LMB in saline waters need a careful risk evaluation due to potential lanthanum release, and issues related to La accumulation, increase of suspended solids and drastic resources depletion still need to be explored, in particular for sediment dwelling organisms.
Journal ArticleDOI
Aquatic ecotoxicity of lanthanum - A review and an attempt to derive water and sediment quality criteria.
TL;DR: In this article, a review of existing information on bioaccumulation and ecotoxicity of lanthanum in the aquatic environment is presented, focusing on the freshwater and the marine environment, and tackles the water column and sediments.
References
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MINTEQA2/PRODEFA2, a geochemical assessment model for environmental systems: Version 3. 0 user's manual
TL;DR: The report describes how to use the MINTEQA2 model, a geochemical speciation model capable of computing equilibria among the dissolved, adsorbed, solid, and gas phases in an environmental setting, which includes an extensive database of reliable thermodynamic data.
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The rare earth elements in rivers, estuaries, and coastal seas and their significance to the composition of ocean waters
TL;DR: The concentrations of rare earth elements (REEs) in samples from 15 rivers, from 6 estuarine transects, and of 5 coastal seawaters are reported and have been used with literature data to examine the continuity in average REE pattern between average continental crust and the dissolved input of REE to the oceans via estuaries.
Journal ArticleDOI
Humic Ion-Binding Model VI: An Improved Description of the Interactions of Protons and Metal Ions with Humic Substances
TL;DR: In this article, a discrete site/electrostatic model of the interactions of protons and metals with fulvic and humic acids is applied to 19 sets of published data for proton binding, and 110 sets for metal binding.
Journal ArticleDOI
The aqueous geochemistry of the rare-earth elements and yttrium
TL;DR: Theoretical considerations suggest that trivalent REE and Y should exhibit strong, predominantly electrostatic complexing with hard ligands such as fluoride, sulfate, phosphate, carbonate and hydroxide and this is borne out by the available experimental data.
Journal ArticleDOI
Ocean particle chemistry: The fractionation of rare earth elements between suspended particles and seawater
TL;DR: In this paper, a new method is explored for estimating the residence time of suspended particles by combining the Ce concentration data of dissolved and surface-bound phases with the Ce(III) oxidation rate measurements of MOFFETT (1990).
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