Accumulation and elimination of lanthanum by duckweed (<i>Lemna minor</i> L.) As influenced by organism growth and lanthanum sorption to glass

Weltje, Lennart; Brouwer, Anke H.; Verburg, T.G.; Wolterbeek, Hubert Th.; Goeij, J.J.M. de

doi:10.1002/etc.5620210721

Cited by 18 publications

(2 citation statements)

References 26 publications

(25 reference statements)

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“…It should be mentioned that, contrary to the test medium for invertebrates containing carbonate and sulphate, the medium used in charophyte algae survival observations contained only chloride salts, and thus speciation effects in the water bulk were not expected. Some changes of exposure concentrations could occur due to adsorption of REEs onto glass Petri dishes, as was documented for La (up to 25% of the total amount [53]). In our experiments, this possibility was diminished, since media were periodically renewed.…”

Section: Resultsmentioning

confidence: 74%

Ecotoxicity Responses of the Macrophyte Algae Nitellopsis obtusa and Freshwater Crustacean Thamnocephalus platyurus to 12 Rare Earth Elements

et al. 2020

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Due to unique chemical properties, rare earth elements (REEs) are increasingly used in versatile technological applications. They are considered emerging environmental contaminants, since they become mobile instead of being bound in rocks. At present, the information on REE effects to aquatic biota is scarce and contradictory. This study aims to explore the ecotoxicity of 11 lanthanides (La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Er, and Lu) and yttrium (Y) to charophyte algae Nitellopsis obtusa and microcrustaceans Thamnocephalus platyurus. Median lethal concentrations (LC50) were assessed in characean cells at 8, 12, 16, 20, and 24 days of exposure, and 24-h LC50s were determined in shrimps. According to the EU−Directive 93/67/EEC hazard classification scheme and 24-day LC50 values generated for N. obtusa, REE effects were assigned from “harmful” to “very toxic” (Gd), while 24-h LC50s for T. platyurus were classified as “harmful” or “toxic” (based on nominal concentrations) and as “toxic” or “very toxic” (based on REE free ion concentrations calculated with CHEAQS Next software). The data obtained for algae showed correlations with the REE atomic numbers (r = −0.68, p < 0.05) and ionic radii (r = 0.65, p < 0.05) at the most extended 24-day exposure only. The analysis of the trends of concentration−response (c–r) curves obtained at increasing exposure durations (8–24 days), alongside the 24-day LC50s ranging within almost two orders of magnitude, allowed a more-toxic heavy REE group to be distinguished, and somewhat different modes REE actions to be envisioned for N. obtusa.

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Section: Resultsmentioning

confidence: 74%

Ecotoxicity Responses of the Macrophyte Algae Nitellopsis obtusa and Freshwater Crustacean Thamnocephalus platyurus to 12 Rare Earth Elements

et al. 2020

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“…A number of deficiencies in the published data were identified including a failure to adequately describe the test media and the use of nominal rather than measured concentrations. The importance of reporting measured concentrations was highlighted by Weltje et al (2002Weltje et al ( , 2003, with losses due to adsorption to container surfaces and membrane filters being significant loss pathways.…”

Section: Aquatic Toxicitymentioning

confidence: 99%

Metal contaminants of emerging concern in aquatic systems

Batley

Campbell

2022

Environ. Chem.

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Environmental context There is potential for a range of metals being used in emerging industries to pose a risk if they reach aquatic environments. This is assessed by evaluating known environmental concentrations against available toxicity data. In most instances risks are low with current usage. Areas are identified where additional data are needed. Abstract The environmental concentrations and aquatic toxicity of a range of technology-critical metals comprising platinum group and rare earth group elements, together with gallium, germanium, indium, lithium, niobium, rhenium, tantalum, tellurium and thallium, have been reviewed to determine whether they pose a risk to aquatic ecosystem health. There is a reasonable body of toxicity data for most, but the quality is quite variable, and more data are required. Chronic toxicity EC10 or NOEC values are generally in the low mg L–1 range, far higher than the current environmental concentrations in the ng L–1 range, meaning that the existing risks to ecosystem health are extremely low. Missing are reliable toxicity data for niobium and tantalum, while confounding results for lanthanum toxicity need to be resolved. There is a likelihood that the currently low concentrations of most of these elements will increase in future years. Whether these concentrations are in bioavailable forms remains to be reliably determined. For most of the elements, measured speciation information is scarce, and unfortunately the thermodynamic data required to calculate their speciation are incomplete. In addition to this problem of uncertain speciation for some of these metals, notably those present in oxidation states of III or higher, there is also a need to explore the links between speciation and bioavailability for these higher valence metals. For circumneutral solutions, the calculated concentrations of the free metal ion tend to be very low for these metals and under such conditions the link between metal speciation and bioavailability is unclear.

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Accumulation and toxicity of lanthanum and neodymium in horticultural plants (Brassica chinensis L. and Helianthus annuus L.)

2018

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The dose‐response of two horticultural plant species (Brassica chinensis L., and Helianthus annuus L.) to two light Rare Earth Elements (REEs), namely lanthanum and neodymium, in‐vitro, was investigated. The phytotoxicity of the studied REEs was determined by measuring the aboveground and belowground biomass of the plant parts, and the chlorophyll production. Based on these measurements, inhibition concentration causing 50 % decrease (IC50) in plant biomass and total chlorophyll were calculated. Moreover, the available ionic species of La and Nd in the media for plant uptake were predicted using Visual MINTEQ. The concentration of these elements were measured in different plant tissues to assay the ability of these plants to hyperaccumulate La and Nd. It was observed that La and Nd, at lower dosages (<∼100 mg/kg), had hormetic effects, respectively, on the shoot and root of H. annuus L. Also, Nd had stimulatory effects on the number of leaves and chlorophyll content of B. chinensis L. However, these two elements were toxic to both plants at higher media concentrations. Between the two plant species, H. annuus L. was more resistant to the studied REEs when compared to B. chinensis L. IC50 values of La for the roots and shoots of both plant species (139–201 mg/kg) were markedly smaller when compared to IC50 values of Nd (222–333 mg/kg). Thus, between the two assayed elements, La was more toxic to the plants. Translocation factors for La and Nd were not high enough to consider the plant species as hyperaccumulators.

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Accumulation and elimination of lanthanum by duckweed (Lemna minor L.) As influenced by organism growth and lanthanum sorption to glass

Cited by 18 publications

References 26 publications

Ecotoxicity Responses of the Macrophyte Algae Nitellopsis obtusa and Freshwater Crustacean Thamnocephalus platyurus to 12 Rare Earth Elements

Ecotoxicity Responses of the Macrophyte Algae Nitellopsis obtusa and Freshwater Crustacean Thamnocephalus platyurus to 12 Rare Earth Elements

Metal contaminants of emerging concern in aquatic systems

Accumulation and toxicity of lanthanum and neodymium in horticultural plants (Brassica chinensis L. and Helianthus annuus L.)

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