Incidence and persistence of silver nanoparticles throughout the wastewater treatment process

Cervantes-Avilés, Pabel; Huang, Yuxiong; Keller, Arturo A.

doi:10.1016/j.watres.2019.03.031

Cited by 56 publications

(25 citation statements)

References 71 publications

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“…Compared to NTA, sp-ICP-MS showed a limitation for sizing nano-Ag below 18 nm. This has been already observed when nano-Ag are quantified and characterized in water or wastewater (Azimzada et al, 2017;Cervantes-Avil es et al, 2019;Hadioui et al, 2014;Lee et al, 2014). Hence, characterizing nano-Ag smaller than 20 nm by sp-ICP-MS is highly sensitive, even when using ion exchange resin column.…”

Section: Stability Of Ag-pvp Nps In Synthetic Wastewater Over Timementioning

confidence: 75%

“…In both approaches, models and nanometrology, wastewater treatment plants (WWTPs) have been considered as a crucial barrier that can remove the NPs released to the wastewater before they enter the environment (Cao et al, 2018;Lazareva and Keller, 2014;Westerhoff et al, 2015). In many cases, WWTPs can remove over 90% of NPs, as the sewage passes throughout the physical, chemical and biological treatment processes (Cervantes-Avil es et al, 2019;Kaegi et al, 2013;Westerhoff et al, 2018). Some transformation of the ENMs, such as nano-Ag, is expected before, during and after wastewater treatment facilities: in the sewer, in the WWTP and later when the effluent is discharged into water bodies (Brunetti et al, 2015;Li et al, 2013;.…”

Section: Introductionmentioning

confidence: 99%

“…However, the advantages of NTA include a lower concentration detection limit compared to DLS, as well as the visualization and characterization of NPs at PECs (Korenstein et al, 2013). sp-ICP-MS is another technique that can be used to quantify and characterize NPs at ng/L (Cervantes-Avil es et al, 2019;Hadioui et al, 2014;Mitrano et al, 2012;Montaño et al, 2014), and determine the ionic concentration released from the NPs at PEC levels in environmental and complex matrices (Azimzada et al, 2017). The simultaneous use of sp-ICP-MS and NTA can yield new insights on the stability of NPs at PECs in complex media that was not possible to observe with previous methods due to their high detection limits.…”

Section: Introductionmentioning

confidence: 99%

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Multi-technique approach to study the stability of silver nanoparticles at predicted environmental concentrations in wastewater

2019

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The concentration of silver nanoparticles (nano-Ag) in aqueous media influences the kinetics of ion release; hence, the transformation and stability of nano-Ag are also influenced. The stability, dissolution and further transformation of nano-Ag in aqueous media at predicted environmental concentrations (PECs) mg/L may differ from that reported at higher concentrations. Analytical techniques characterizing nanoparticles (NPs) at mg/L have advantages and limitations, including an inherent bias based on theoretical and analytical considerations, as well as the matrix effects. In this work, we applied nanoparticle tracking analysis (NTA), single particle ICP-MS (sp-ICP-MS), and localized surface plasmon resonance (LSPR) analysis to study the stability and dissolution of nano-Ag with different nominal sizes (20, 40, 80 and 100 nm) at PECs in synthetic wastewater (SWW). The influence of the main wastewater constituents, such as organic matter, Cl À , S 2À , PO 4 3À and NH 4 þ , on the stability and dissolution of nano-Ag (40 nm) at PECs was also determined. Diagrams of the predominant species of silver exposed to major ligands were generated using MINTEQ. After 5 h in SWW, 20 nm nano-Ag dissolved 19.27% and 40 nm nano-Ag dissolved 14.8%. Aggregates of Ag particles were clearly noted for 80 and 100 nm nano-Ag after 5 h of exposure to SWW. Aggregates size also ranged very similar for both techniques, NTA and sp-ICP-MS, 29e211 nm and 38e241 for NTA and 48e210 and 50e220 nm, for sp-ICP-MS, respectively. Monodispersed size distribution (22e85 nm) and low dissolution (up to 5.1%) of nano-Ag at PECs were observed in presence of organic matter (5e800 mg/L) and PO 4 3À (9.5e47.5 mg/L), while precipitation and higher dissolution (up to 74.9%) were observed in media containing either Cl À (0.07e10.64 g/L), S 2À (0.32 e32.1 mg/L) or NH 4 þ (36e90 mg/L), respectively. Speciation diagrams predict the formation of Ag 2 S (s) and AgCl (s) , and soluble species such as AgCl x (xÀ1)-, AgNH 3 þ and Ag(NH 3) 2þ when Ag þ at PECs in wastewater. The NTA and sp-ICP-MS were suitable techniques for sizing nano-Ag in wastewater at PECs at experimented nominal sizes. sp-ICP-MS was also useful to quantify the coexistence of Ag þ and nano-Ag. The LSPR analysis served to determine the relative persistence of original nano-Ag at PECs in the wastewater during the first 5 h after spiking.

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Section: Stability Of Ag-pvp Nps In Synthetic Wastewater Over Timementioning

confidence: 75%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Multi-technique approach to study the stability of silver nanoparticles at predicted environmental concentrations in wastewater

2019

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“…The contamination of the environment by the consumption of nAg raised the question about their potential impacts to the environment. For example, Ag was detected in treated municipal wastewaters at a concentration of 70 ng/L with colloidal Ag (nAg) representing circa 5-10% of total Ag [2]. Moreover, most of the nAg were below 100 nm and a secondary treatment process (biological and physicochemical treatments) removed about 75% of the colloidal Ag indicating that a significant amount is still being released in the environment.…”

Section: Introductionmentioning

confidence: 99%

“…According to the manufacturer's data sheet based on transmittance electron microscopy 2. Measured by DLS as described in Materials and Methods at 50 μg/L concentration in either Milli-Q or aquarium water.…”

mentioning

confidence: 99%

The Influence of Surface Coatings of Silver Nanoparticles on the Bioavailability and Toxicity to Elliptio complanata Mussels

Auclair

Turcotte

Gagnon

et al. 2019

Journal of Nanomaterials

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Nanomaterials could be modified with various coatings which could modulate their behavior in the environment, bioavailability and toxicity. The purpose of this study was to determine if the selected coatings of silver nanoparticles (nAg) could influence the fate, bioavailability, and toxicity toward suspension feeding freshwater mussels, Elliptio complanata. Mussels were exposed for 96 h to 50 μg/L of nAg with the following surface coatings: citrate, silicate (Si), polyvinylpyrrolidone (PVP), and branched polyethylenimine (bPEI). After the exposure period, mussels were analyzed for total Ag, resistance to air emersion, oxidative stress, genotoxicity, and autophagosome protein uptake (protein ubiquitinylation) in gills and digestive glands. The data revealed that citrate- and PVP-coated nAg were 2 times more abundant in the digestive gland compared to bPEI- and Si-coated nAg with estimated bioaccumulation factors between 5 and 10. The data revealed that tissue Ag levels were closely associated with air survival time, weight loss during air exposure, DNA strand breaks, LPO, and protein-ubiquitin levels in the digestive gland. The data supports the hypothesis that the coatings could influence bioavailability and toxicity in freshwater mussels.

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Analytical methods for microplastics in the environment: a review

Huang

Wang

2022

Environ Chem Lett

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Microplastic pollution is a recently discovered threat to ecosystems requiring the development of new analytical methods. Here, we review classical and advanced methods for microplastic analysis. Methods include visual analysis, laser diffraction particle, dynamic light scattering, scanning electron microscopy, Fourier-transform infrared spectroscopy, Raman spectroscopy, thermal analysis, mass spectrometry, aptamer and in vitro selection, and flow cytometry.

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Incidence and persistence of silver nanoparticles throughout the wastewater treatment process

Cited by 56 publications

References 71 publications

Multi-technique approach to study the stability of silver nanoparticles at predicted environmental concentrations in wastewater

Multi-technique approach to study the stability of silver nanoparticles at predicted environmental concentrations in wastewater

The Influence of Surface Coatings of Silver Nanoparticles on the Bioavailability and Toxicity to Elliptio complanata Mussels

Analytical methods for microplastics in the environment: a review

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