Modeling aggregation and sedimentation of nanoparticles in the aquatic environment

Markus, Arjen; Parsons, John R.; Roex, Erwin; Voogt, P. de; Laane, R.W.P.M.

doi:10.1016/j.scitotenv.2014.11.056

Cited by 95 publications

(70 citation statements)

References 27 publications

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“…To estimate the risk to ecosystems, predicted [ENMs] from the various release scenarios were compared to species sensitivity distributions (SSDs) for freshwater and soil systems where available and to individual species end points, e.g., no 50 ), when SSDs were not available. 12,96 We used two toxicity thresholds, the no observed adverse effect level (NOAEL) and the lethal concentration required to kill 50% of the population (LC 50 ), to calculate the 5% hazardous concentration (HC 5 ).…”

Section: −99mentioning

confidence: 99%

“…However, if current releases increase and a substantial spill occurs, the effects would be of concern, primarily for ZnO and secondarily for TiO 2 and CuO. 54 In addition, while air PECs are generally low under these specific scenarios, localized releases that result in ambient concentration Comparison between the range of predicted daily (A) freshwater concentrations and (B) soil concentrations and several toxicity end points above which a toxic effect would be observed for 5% of species in a freshwater ecosystem: the NOEC, LOEC, LC 50 , or EC 50 . Each box and whiskers plot shows the range in daily concentrations for each release scenario with the mean depicted as a black horizontal line.…”

Section: Significancementioning

confidence: 99%

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

Garner

Suh

Keller

2017

Environ. Sci. Technol.

220

166

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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: −99mentioning

confidence: 99%

Section: Significancementioning

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.

220

166

View full text Add to dashboard Cite

show abstract

“…Typically, the processes of nanoparticles in the aqueous solutions include aggregation (homoaggregation and heteroaggregation), sedimentation, dissolution and chemical transformation [82]. Homoaggregation involves particles of the same type, while heteroaggregation occurs between particles of different types, size and properties [83].…”

Section: Heteroaggregation and The Role Of Natural Organic Mattermentioning

confidence: 99%

“…Also, the effects of flow velocity and hydrology have not been considered in heteroaggregation. For better modeling of heteroaggregation in natural water bodies, we need more experimental datasets to provide information on these parameters that are largely unaccounted for [82].…”

Section: Application Of a Heteroaggregation Modelmentioning

confidence: 99%

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Heteroaggregation of nanoparticles with biocolloids and geocolloids

Wang

Adeleye

Huang

et al. 2015

Advances in Colloid and Interface Science

169

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The application of nanoparticles has raised concern over the safety of these materials to human health and the ecosystem. After release into an aquatic environment, nanoparticles are likely to experience heteroaggregation with biocolloids, geocolloids, natural organic matter (NOM) and other types of nanoparticles. Heteroaggregation is of vital importance for determining the fate and transport of nanoparticles in aqueous phase and sediments. In this article, we review the typical cases of heteroaggregation between nanoparticles and biocolloids and/or geocolloids, mechanisms, modeling, and important indicators used to determine heteroaggregation in aqueous phase. The major mechanisms of heteroaggregation include electric force, bridging, hydrogen bonding, and chemical bonding. The modeling of heteroaggregation typically considers DLVO, X-DLVO, and fractal dimension. The major indicators for studying heteroaggregation of nanoparticles include surface charge measurements, size measurements, observation of morphology of particles and aggregates, and heteroaggregation rate determination. In the end, we summarize the research challenges and perspective for the heteroaggregation of nanoparticles, such as the determination of α hetero values and heteroaggregation rates; more accurate analytical methods instead of DLS for heteroaggregation measurements; sensitive analytical techniques to measure low concentrations of nanoparticles in heteroaggregation systems; appropriate characterization of NOM at the molecular level to understand the structures and fractionation of NOM; effects of different types, concentrations, and fractions of NOM on the heteroaggregation of nanoparticles; the quantitative adsorption and desorption of NOM onto the surface of nanoparticles and heteroaggregates; and a better understanding of the fundamental mechanisms and modeling of heteroaggregation in natural water which is a complex system containing NOM, nanoparticles, biocolloids and geocolloids.

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Essential Approaches and Forces

2017

Design of Nanostructures

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Modeling aggregation and sedimentation of nanoparticles in the aquatic environment

Cited by 95 publications

References 27 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

Heteroaggregation of nanoparticles with biocolloids and geocolloids

Essential Approaches and Forces

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