Developing a systematic method for extraction of microplastics in soils

Radford, Freya; Zapata-Restrepo, Lina M.; Horton, Alice A.; Hudson, Malcolm D.; Shaw, Peter J.; Williams, I.D.

doi:10.1039/d0ay02086a

Cited by 106 publications

(52 citation statements)

References 55 publications

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“…Recovery rates in compost samples show a matching trend to OECD arti cial soil with increasing recovery rates in increasing density but they were lower in every solution in compost compared to OECD arti cial soil. The decreased recovery rates can be attributed to the content of organic matter which was also shown in other studies (Radford et al 2021). Compost had a content of organic matter triple the amount of arti cial soil.…”

Section: Recovery Rates Of Mpssupporting

confidence: 82%

“…IR-spectra of conventional polymers with H 2 O 2 at 60°C also showed "no major deviations from control"(Hurley et al 2018). Effects of H 2 O 2 on MPs were also not detected by(Radford et al 2021). The results of spectral changes t results of size change for MB with H 2 O 2 at 60°C as impact factor.…”

mentioning

confidence: 83%

“…al. 2019;Vermeiren et al 2020;Radford et al 2021). Recovery rates were higher for conventional polymers than for biopolymers in every solution and substrate.…”

mentioning

confidence: 95%

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Analysis of Conventional and Biodegradable Microplastics in Solid Sample Matrices: A Contribution to Method Standardization

Schütze

Thomas

Kraft

et al. 2021

Preprint

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Microplastics are the new emerging pollutants ubiquitously detectable in aquatic and terrestrial ecosystems. Fate and behavior as well as ecotoxicity are of increasing environmental concern particularly in sediments and soils as natural sinks. For a global environmental risk assessment reliable and easy to apply analytical methods are mandatory to obtain comparable data. This is based on the isolation of microplastics out of the solid sample matrices prior to instrumental detection. Thus, this study provides a validated approach for density separation, which emerged from a comparative study using different salt solutions to isolate conventional and for the first time biodegradable microplastics from different solid sample matrices, i.e., sand, artificial soil, and compost. Four solutions (water, sodium chloride, sodium hexametaphosphate and sodium bromide) of different densities were applied followed by oxidizing digestion. Finally, the impact of the procedures on size and surface properties of microplastics was tested. Dependent on the sample matrix, highest recovery rates of 87.3-100.3 % for conventional polymers and 38.2–78.2 % for biodegradable polymers were determined with sodium bromide. It could be shown that the type of solid sample matrix influences the recovery rates and has to be considered when choosing a sample preparation technique.

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Section: Recovery Rates Of Mpssupporting

confidence: 82%

mentioning

confidence: 83%

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Analysis of Conventional and Biodegradable Microplastics in Solid Sample Matrices: A Contribution to Method Standardization

Schütze

Thomas

Kraft

et al. 2021

Preprint

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“…As a measure of quality assurance, recovery rates (positive control) must be determined and reported. Numerous authors have pointed out the importance and necessity of spike-and-recovery approach as a part of standardized protocol for extraction of microplastic particles [2 , 11 , 18 , 25] . Still, the challenge remains since recovery success may differ due to protocol applied, variability of environmental matrices and polymer properties such as type, shape and size [3 , 25] .…”

Section: Methods Detailsmentioning

confidence: 99%

Hide-and-seek: Threshold values and contribution towards better understanding of recovery rate in microplastic research

et al. 2022

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Microplastic pollution has become one of the most pressing environmental issues. A fundamental criterion for risk assessment is the concentration of found microplastic that can be altered during microplastic isolating from the sample. Recovery rate (i.e. positive control) is an important feedback component that identifies accuracy, quality and efficiency of sample processing, same as physical and chemical impact. Here, using 100 µm red polystyrene (PS) beads we have tested some methodological steps that can be responsible for the possible microplastic losses during sample treatment and based on that, we provided a recovery rate threshold values. Our results support that the choice of the extraction method (vacuum filtration versus wet sieving) results in lower recoverability when vacuum filtration is used and that used separatory funnels size versus material amount impacts the efficiency or recoverability in density separation. We have also analysed microplastic recovery rate when different samples treatment steps from widely used isolation protocols (sediment and water) were applied and our results suggest that there are a number of factors affecting recovery rates, of which physical effects (loss by consecutive treatment steps due to material transfer) are more important than possible chemical degradation. Sample filtration method determines recovery rate from < 40 to > 80%. The number of sample processing steps involving transfer has a direct impact on recovery rate. As a measure of quality assurance, recovery rate thresholds are introduced.

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“…This finding is comparable across other media. For example, Radford et al (2021) 70 found PET had the lowest recovery rates in soil, whereas LDPE had the highest recovery rates. In some cases, the high-density polymers can be recovered with the higher-density solutions, such as zinc bromide (ZnBr 2 ).…”

Section: Discussionmentioning

confidence: 99%

Assessing the effectiveness of microplastic extraction methods on fishmeal with different properties

et al. 2022

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Developing a systematic method for extraction of microplastics in soils

Abstract: Microplastic extraction efficency from soil depends on soil compostion.

Cited by 106 publications

References 55 publications

Analysis of Conventional and Biodegradable Microplastics in Solid Sample Matrices: A Contribution to Method Standardization

Analysis of Conventional and Biodegradable Microplastics in Solid Sample Matrices: A Contribution to Method Standardization

Hide-and-seek: Threshold values and contribution towards better understanding of recovery rate in microplastic research

Assessing the effectiveness of microplastic extraction methods on fishmeal with different properties

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