Use of filtration techniques to study environmental fate of engineered metallic nanoparticles: Factors affecting filter performance

Koetsem, Frederik Van; Verstraete, S.; Wallaert, Elien; Verbeken, Kim; Meeren, Paul Van der; Rinklebe, Jörg; Laing, Gijs Du

doi:10.1016/j.jhazmat.2016.05.098

Cited by 28 publications

(11 citation statements)

References 43 publications

(79 reference statements)

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“…Ultrafiltration membranes are well described with respect to the separation of globular proteins; however, very small (<5 nm) AgNPs may pose unique challenges for separation of soluble from particulate species. Average pore sizes for 10 kDa molecular weight cut off filters used in centrifugal filtration have been estimated at 3.2 ± 2.3 nm (Van Koetsem et al, 2017). These investigators further indicated that a 10 kDa membrane was suitable for separating 14 nm AgNPs from the ionic Ag fraction.…”

Section: Resultsmentioning

confidence: 99%

Characterization of engineered nanoparticles in commercially available spray disinfectant products advertised to contain colloidal silver

Rogers

Navrátilová

Stefaniak

et al. 2018

Science of The Total Environment

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Given the potential for human exposure to silver nanoparticles from spray disinfectants and dietary supplements, we characterized the silver-containing nanoparticles in 22 commercial products that advertised the use of silver or colloidal silver as the active ingredient. Characterization parameters included: total silver, fractionated silver (particulate and dissolved), primary particle size distribution, hydrodynamic diameter, particle number, and plasmon resonance absorbance. A high degree of variability between claimed and measured values for total silver was observed. Only 7 of the products showed total silver concentrations within 20% of their nominally reported values. In addition, significant variations in the relative percentages of particulate vs. soluble silver were also measured in many of these products reporting to be colloidal. Primary silver particle size distributions by transmission electron microscopy (TEM) showed two populations of particles - smaller particles (<5nm) and larger particles between 20 and 40nm. Hydrodynamic diameter measurements using nanoparticle tracking analysis (NTA) correlated well with TEM analysis for the larger particles. Z-average (Z-Avg) values measured using dynamic light scattering (DLS); however, were typically larger than both NTA or TEM particle diameters. Plasmon resonance absorbance signatures (peak absorbance at around 400nm indicative of metallic silver nanoparticles) were only noted in 4 of the 9 yellow-brown colored suspensions. Although the total silver concentrations were variable among products, ranging from 0.54mg/L to 960mg/L, silver containing nanoparticles were identified in all of the product suspensions by TEM.

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Section: Resultsmentioning

confidence: 99%

Characterization of engineered nanoparticles in commercially available spray disinfectant products advertised to contain colloidal silver

Rogers

Navrátilová

Stefaniak

et al. 2018

Science of The Total Environment

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“…After filtration through 0.45-μm syringe filters (Chemland), samples were centrifuged in a 3-kDa ultrafiltration device (Amicon Ultra-15 Filters, Millipore) for 45 min at 4000× g . The 3-kDa pore size is estimated to be 2.1 ± 1.3 nm (Van Koetsem et al 2017); hence, it prevents the penetration of nanoparticles through the membrane and at the same time allows the penetration of ions. Then, the water extracts and ultrafiltrates were acidified with a drop of HNO 3 and analyzed for Zn concentration using flame AAS (Perkin Elmer AAnalyst 200).…”

Section: Methodsmentioning

confidence: 99%

Energy reserves and respiration rate in the earthworm Eisenia andrei after exposure to zinc in nanoparticle or ionic form

Świątek

Bednarska

2019

Environ Sci Pollut Res

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The energy budget is an indicator of an organism’s overall condition. Changes in energy reserves and/or energy consumption have been used as biomarkers of toxic stress. To understand the effects of different forms and concentrations of Zn and the costs of effective Zn regulation by the earthworm Eisenia andrei , we performed a toxicokinetic experiment in which individuals were sampled over time to determine the available energy reserves (total carbohydrate, protein, and lipid content), energy consumption (measured at the cellular level and as the whole-animal respiration rate), and internal Zn concentration. The earthworms were exposed to ZnCl 2 or zinc nanoparticles (ZnO-NPs) in Lufa 2.2 soil for 21 days (contamination phase), followed by 14 days of elimination in clean soil (decontamination phase). Carbohydrates were the only energy reserves with significantly lower levels following ZnO-NP 1000 treatment than following other treatments ( p ≤ 0.00001) in the contamination phase. The total available energy reserves and protein content did not differ among treatments, but a significant effect of exposure time was observed ( p ≤ 0.0001). Exposure to Zn (both ions and NPs) increased energy consumption at the cellular level, reflecting the high energy demand of the stress response. The results indicated that E. andrei can regulate internal Zn concentrations efficiently, regardless of form or concentration, without considerable impact on energy reserves or respiration rate. Electronic supplementary material The online version of this article (10.1007/s11356-019-05753-3) contains supplementary material, which is available to authorized users.

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“…3). For example, some losses are likely to be attributed to the filtration step, where dissolved ions and/or particles may sorb to the filter, or to plant fragments which are then removed by the filter; subsequent blocking of the filter could result in further losses [64,69]. Therefore, careful assessment of the particle recovery and reproducibility for the MeOH method presented above was undertaken.…”

Section: Total Metal and Particle Number Concentration Recovery And Rmentioning

confidence: 99%

“…For Au NP, the addition of plant material to the extraction seems to aid the recovery, though the lettucecontaining condition is not statistically different from the Au NP only extract (averaging 100% recovery with plant tissues compared to 91.6% recovery without). This is hypothesized to be a result of additional organic matter (from the degradation of the leaf tissue) priming the filter to allow the greater passage of Au NP, a phenomenon referred to as "filter wetting" [69]. Losses for all three NPs were lowest when in the presence of lettuce.…”

Section: Total Metal and Particle Number Concentration Recovery And Rmentioning

confidence: 99%

“…This may be due to sorption of NP or dissolved ions to organic matter [70][71][72][73], which would prevent their passage through the 1.0-μm filter used before spICP-MS analysis, thus increasing the losses observed in Table 4 relative to Au NP. Additionally, the dissolved ions or NP may bind to the filter material itself even though the filters were pre-rinsed with DI water [69]. Notably, removal of a portion of the ionic content during the extraction process would allow better statistical processing of the particle data from the ICP-TOF-MS and thus could be a benefit of using this method in environmental studies.…”

Section: Total Metal and Particle Number Concentration Recovery And Rmentioning

confidence: 99%

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Methanol-based extraction protocol for insoluble and moderately water-soluble nanoparticles in plants to enable characterization by single particle ICP-MS

et al. 2020

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The detection and characterization of soluble metal nanoparticles in plant tissues are an analytical challenge, though a scientific necessity for regulating nano-enabled agrichemicals. The efficacy of two extraction methods to prepare plant samples for analysis by single particle ICP-MS, an analytical method enabling both size determination and quantification of nanoparticles (NP), was assessed. A standard enzyme-based extraction was compared to a newly developed methanol-based approach. Au, CuO, and ZnO NPs were extracted from three different plant leaf materials (lettuce, corn, and kale) selected for their agricultural relevance and differing characteristics. The enzyme-based approach was found to be unsuitable because of changes in the recovered NP size distribution of CuO NP. The MeOH-based extraction allowed reproducible extraction of the particle size distribution (PSD) without major alteration caused by the extraction. The type of leaf tissue did not significantly affect the recovered PSD. Total metal losses during the extraction process were largely due to the filtration step prior to analysis by spICP-MS, though this did not significantly affect PSD recovery. The methanol extraction worked with the three different NPs and plants tested and is suitable for studying the fate of labile metal-based nano-enabled agrichemicals.

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Use of filtration techniques to study environmental fate of engineered metallic nanoparticles: Factors affecting filter performance

Cited by 28 publications

References 43 publications

Characterization of engineered nanoparticles in commercially available spray disinfectant products advertised to contain colloidal silver

Characterization of engineered nanoparticles in commercially available spray disinfectant products advertised to contain colloidal silver

Energy reserves and respiration rate in the earthworm Eisenia andrei after exposure to zinc in nanoparticle or ionic form

Methanol-based extraction protocol for insoluble and moderately water-soluble nanoparticles in plants to enable characterization by single particle ICP-MS

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