Environmental release, fate and ecotoxicological effects of manufactured ceria nanomaterials

Collin, Blanche; Auffan, Mélanie; Johnson, Andrew C.; Kaur, Inder Preet; Keller, Arturo A.; Lazareva, Anastasiya; Lead, Jamie R.; Ma, Xingmao; Merrifield, Ruth C.; Svendsen, Claus; White, Jason C.; Unrine, Jason M.

doi:10.1039/c4en00149d

Cited by 101 publications

(101 citation statements)

References 108 publications

(210 reference statements)

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“…A comparison of long-term concentrations in freshwater environments with predicted hazardous concentrations at which 5% of species in a freshwater ecosystem will be harmed (HC 5 ) indicates that even under the highest release scenario considered in this study CeO 2 will likely be well below the NOEC and the lowest observed effect concentration (LOEC) (Figures 4 and S22A). 133 Under all release scenarios, CuO does not exceed the NOEC HC 5 ( Figure S22B). The single species NOAEC line (light green line, D. magna) indicates that under the considered scenarios it is still unlikely that toxic effects would be observed in freshwater except in the highest release scenario considered ( Figure S22B).…”

Section: ■ Resultsmentioning

confidence: 99%

Assessing the Risk of Engineered Nanomaterials in the Environment: Development and Application of the nanoFate Model

Garner

Suh

Keller

2017

Environ. Sci. Technol.

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213

163

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We developed a dynamic multimedia fate and transport model (nanoFate) to predict the time-dependent accumulation of metallic engineered nanomaterials (ENMs) across environmental media. nanoFate considers a wider range of processes and environmental subcompartments than most previous models and considers ENM releases to compartments (e.g., urban, agriculture) in a manner that reflects their different patterns of use and disposal. As an example, we simulated ten years of release of nano CeO 2 , CuO, TiO 2 , and ZnO in the San Francisco Bay area. Results show that even soluble metal oxide ENMs may accumulate as nanoparticles in the environment in sufficient concentrations to exceed the minimum toxic threshold in freshwater and some soils, though this is more likely with high-production ENMs such as TiO 2 and ZnO. Fluctuations in weather and release scenario may lead to circumstances where predicted ENM concentrations approach acute toxic concentrations. The fate of these ENMs is to mostly remain either aggregated or dissolved in agricultural lands receiving biosolids and in freshwater or marine sediments. Comparison to previous studies indicates the importance of some key model aspects including climatic and temporal variations, how ENMs may be released into the environment, and the effect of compartment composition on predicted concentrations.

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Section: ■ Resultsmentioning

confidence: 99%

Assessing the Risk of Engineered Nanomaterials in the Environment: Development and Application of the nanoFate Model

Garner

Suh

Keller

2017

Environ. Sci. Technol.

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213

163

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“…Metal concentrations for all three ENMs are reported as ionic, although neither CeO 2 nor TiO 2 were expected to dissolve to a significant degree under the conditions used in this experiment. TiO 2 is known to be highly insoluble in water and CeO 2 is similarly insoluble at pH similar to those found in the soils used here (Collin et al, 2014). However, Cu(OH) 2 has been shown to undergo partial dissolution under acidic to neutral conditions, although at acidic pH less dissolution occurs in media with high concentrations of dissolved organic matter (Adeleye et al, 2014;Conway et al, 2015).…”

Section: Enm Transport Through Unsaturated Soilmentioning

confidence: 84%

Gravity-driven transport of three engineered nanomaterials in unsaturated soils and their effects on soil pH and nutrient release

Conway

Keller

2016

Water Research

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a b s t r a c tThe gravity-driven transport of TiO 2 , CeO 2 , and Cu(OH) 2 engineered nanomaterials (ENMs) and their effects on soil pH and nutrient release were measured in three unsaturated soils. ENM transport was found to be highly limited in natural soils collected from farmland and grasslands, with the majority of particles being retained in the upper 0e3 cm of the soil profile, while greater transport depth was seen in a commercial potting soil. Physical straining appeared to be the primary mechanism of retention in natural soils as ENMs immediately formed micron-scale aggregates, which was exacerbated by coating particles with Suwannee River natural organic matter (NOM) which promote steric hindrance. Small changes in soil pH were observed in natural soils contaminated with ENMs that were largely independent of ENM type and concentration, but differed from controls. These changes may have been due to enhanced release of naturally present pH-altering ions (Mg 2þ , H þ ) in the soil via substitution processes.These results suggest ENMs introduced into soil will likely be highly retained near the source zone.

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“…Additionally, since TiO 2 and CeO 2 are photoactive and produce ROS when exposed to light, 26,27 we predicted that they would have the greatest effect in plants grown under high illumination by interfering with photosynthesis in leaves.…”

mentioning

confidence: 99%

Environmental Stresses Increase Photosynthetic Disruption by Metal Oxide Nanomaterials in a Soil-Grown Plant

Conway

Beaulieu

et al. 2015

ACS Nano

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Despite an increasing number of studies over the past decade examining the interactions between plants and engineered nanomaterials (ENMs), very few have investigated the influence of environmental conditions on ENM uptake and toxicity, particularly throughout the entire plant life cycle. In this study, soil-grown herbaceous annual plants (Clarkia unguiculata) were exposed to TiO 2 , CeO 2 , or Cu(OH) 2 ENMs at different concentrations under distinct light and nutrient levels for 8 weeks. Biweekly fluorescence and gas exchange measurements were recorded, and tissue samples from mature plants were analyzed for metal content. During peak growth, exposure to TiO 2 and CeO 2 decreased photosynthetic rate and CO 2 assimilation efficiency of plants grown under high light and nutrient conditions, possibly by disrupting energy transfer from photosystem II (PSII) to the Calvin cycle. Exposure Cu(OH) 2 particles also disrupted photosynthesis but only in plants grown under the most stressful conditions (high light, limited nutrient) likely by preventing the oxidation of a primary PSII reaction center. TiO 2 and CeO 2 followed similar uptake and distribution patterns with concentrations being highest in roots followed by leaves then stems, while Cu(OH) 2 was present at highest concentrations in leaves, likely as ionic Cu. ENM accumulation was highly dependent on both light and nutrient levels and a predictive regression model was developed from these data. These results show that abiotic conditions play an important role in mediating the uptake and physiological impacts of ENMs in terrestrial plants.

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Environmental release, fate and ecotoxicological effects of manufactured ceria nanomaterials

Cited by 101 publications

References 108 publications

Assessing the Risk of Engineered Nanomaterials in the Environment: Development and Application of the nanoFate Model

Assessing the Risk of Engineered Nanomaterials in the Environment: Development and Application of the nanoFate Model

Gravity-driven transport of three engineered nanomaterials in unsaturated soils and their effects on soil pH and nutrient release

Environmental Stresses Increase Photosynthetic Disruption by Metal Oxide Nanomaterials in a Soil-Grown Plant

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