Evaluation of continuous flow centrifugation as an alternative technique to sample microplastic from water bodies

Hildebrandt, Lars; Voigt, N.; Zimmermann, Tristan; Reese, Anna; Proefrock, D.

doi:10.1016/j.marenvres.2019.104768

Cited by 41 publications

(26 citation statements)

References 64 publications

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“…As of yet, crossflow ultrafiltration was considered the only technique suitable for nanometer-size-selective sampling of representative volumes. Our results prove that continuous flow centrifugation (CFC) is a valuable alternative for nanoplastic sampling and enrichment, as it does not use a polymer membrane, features a high retention of NPPs and can be used for time-integrated sampling of several hundred liters of source water (Hildebrandt et al, 2019). The proof-of-principleexperiments presented here, in conjunction with expanded theoretical calculations underpin the techniques' potential for size-and density-selective preconcentration of colloidal plastic particles.…”

Section: Discussionsupporting

confidence: 52%

“…The application in the field has already been tested for MP sampling (Hildebrandt et al, 2019). Due to the system's weight (>100 kg), operation on a stationary basis is beneficial.…”

Section: Extended Utility Of Cfc For Field Sampling and Concentrationmentioning

confidence: 99%

“…The application of continuous flow centrifugation (CFC) for efficient sampling of the fine particulate fraction (1 µm -25 µm) in natural water at high flow rates of several hundred liters per hour has already been shown (Douglas et al, 1993;Ran et al, 2000;Conn et al, 2016). Recently, CFC proved to be a suitable technique to quantitatively enrich small MP (model MP ranged from 1 µm to 1 mm) of a variety of polymer types with densities ranging from 0.94 g mL −1 to 1.63 g mL −1 (Hildebrandt et al, 2019). In a second step, it was applied to sample small MP particles from the German Elbe estuary.…”

Section: Introductionmentioning

confidence: 99%

“…The good performance of CFC for MP sampling (Hildebrandt et al, 2019) and its wide application in the biomedical sector to pellet subcellular components (Goodenough, 1974;Kahane et al, 1976;Cacace et al, 1977;Turk et al, 1988) and viruses (Shibley et al, 1980;Wheeler et al, 1986;Anderson et al, 1991) were a motivation to test the enrichment of NPPs by CFC as well. In this study, Pd-doped NPPs were spiked into ultrapure water to assess the efficiency of CFC in retaining NPPs and evaluate the effect of different pump rates (1) and recirculation (2), into natural water to test NPP retention under realistic environmental conditions (3) and into a model matrix suspension with a high concentration of micrometer-sized SPM to evaluate the potential of a serial CFC approach for nanometer-size-selective sampling (separation) (4).…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A Nanoplastic Sampling and Enrichment Approach by Continuous Flow Centrifugation

Hildebrandt

Mitrano

Zimmermann

et al. 2020

Front. Environ. Sci.

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Section: Discussionsupporting

confidence: 52%

“…The application in the field has already been tested for MP sampling (Hildebrandt et al, 2019). Due to the system's weight (>100 kg), operation on a stationary basis is beneficial.…”

Section: Extended Utility Of Cfc For Field Sampling and Concentrationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A Nanoplastic Sampling and Enrichment Approach by Continuous Flow Centrifugation

Hildebrandt

Mitrano

Zimmermann

et al. 2020

Front. Environ. Sci.

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“…There are few technologies capable of effectively removing microplastics from the aqueous environments such as membrane biological reactors, rapid sand filters, dissolved air flotation, and micro-screen filtration with disc filters. Other innovative applications are being studied that show potential but also some limitations: dynamic membranes, enhancement in flocculation/coagulation, electrocoagulation, and photocatalytic processes (Talvitie et al, 2017;Hildebrandt et al, 2019;Freeman et al, 2020). The effectiveness of microplastics removal is dependent on microplastics physical properties, in particular size, shape, and the overall particle abundance (Wang et al, 2019;Wong et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Sequestration of Polystyrene Microplastics by Jellyfish Mucus

et al. 2021

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The worldwide microplastics pollution is a serious environmental and health problem that is currently not effectively mitigated. In this work we tested jellyfish mucus as a new bioflocculent material capable of sequestration of polystyrene microplastics in aqueous environments. Mucus material was collected from different jellyfish species and was used to trap fluorescently tagged polystyrene microspheres. The efficiency of removal was tested using varying concentrations of microplastics and mucus. The interaction between the microplastics and mucus was determined by viscosity measurements and confocal laser scanning microscopy. Different mucus preparation methods were also tested: freshly prepared, mechanically sheared, freeze-thawed, freeze-dried, and hydrolyzed mucus. The results demonstrate that jellyfish mucus can efficiently sequester polystyrene microplastics particles from the suspension. The fraction of the removed microplastics was highest with freshly prepared mucus and decreased with freeze-thawing and freeze-drying. The mucus ability to sequester microplastics was completely lost in the hydrolyzed mucus. The results imply that the intact jellyfish mucus has the potential to be used as a biopolymer capable of removing microplastics material.

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Direct numerical simulation of the distribution of floating microplastic particles in an open channel flow

Sakai

Manhart

2023

Applied Research

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Microplastic fragments in the aquatic environment constitute a major threat for the health and fitness of organisms. However, our quantitative understanding in the microplastic load in typical natural river systems is severely limited due to the large uncertainties associated with the sources and the pathways of the microplastic contamination. To address this knowledge gap, we performed direct numerical simulations of the dynamics and distribution of microplastic particles in turbulent open channel flow at moderate Reynolds numbers. The particle dynamics is characterised by four nondimensional parameters, namely: Reynolds number of the open channel flow (), nondimensional particle diameter () and Galileo () and Stokes () numbers of the particles of which the latter two include the particle‐fluid density ratio (). To limit our scope to the most relevant configuration, we focused on the distribution of weakly buoyant microplastic particles at , whereas the remaining parameters were adjusted to cover the orders of magnitude that can be found in a typical laboratory facility, as well as a natural river. Our simulation results show that the steady‐state microplastic distribution in the turbulent flow is influenced by the Stokes and the Galileo numbers significantly, which ranges from the complete accumulation on the free surface to the homogeneous distribution, and somewhere in between. Moreover, the Galileo number, alongside the flow Reynolds number, were also shown to influence the temporal scaling of the transient behaviour of the gradual accumulation of the microplastics towards the free surface. Both of our findings highlight the complex nature of the particle–turbulence interactions, and motivate further investigations in this approach.

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Evaluation of continuous flow centrifugation as an alternative technique to sample microplastic from water bodies

Cited by 41 publications

References 64 publications

A Nanoplastic Sampling and Enrichment Approach by Continuous Flow Centrifugation

A Nanoplastic Sampling and Enrichment Approach by Continuous Flow Centrifugation

Sequestration of Polystyrene Microplastics by Jellyfish Mucus

Direct numerical simulation of the distribution of floating microplastic particles in an open channel flow

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