Towards a consensus method for the isolation of microplastics from freshwater sediments




HIGHLIGHTS
  • What: This work compared methods for the recovery of microplastics from freshwater sediments based on density separation by flotation followed by digestion of organic matter. With no methodological consensus yet reached, the aim of this study was to contribute to the development of optimized analytical approaches for the isolation of microplastics from freshwater sediment by carrying out a systematic investigation of both the density flotation and the organic matter removal steps. The overall goal was to obtain a protocol that gave the highest microplastic recovery and most effective organic matter removal with minimal damage to the plastic particles. Fine play-pit sand was used to simulate sediment in the investigation of flotation, and peat was used as a representative natural organic material for the comparison of digestion methods.
  • Who: Daniel E. Enenche and colleagues from the Department of Pure and Applied Chemistry, University of Strathclyde, Cathedral Street, Glasgow , XL, UK have published the article: Towards a Consensus Method for the Isolation of Microplastics from Freshwater Sediments, in the Journal: Environments 2024, 11, x FOR PEER REVIEW of /2024/
  • Future: Considerable further research is needed to fully understand their sources abundance distribution fate and impacts . Since size critically affects microplastic mobility and bioavailability further study and perhaps method development is required to ensure that analytical methods accurately capture particle size distributions. Whilst the method developed is suitable for general application in studies of microplastics in freshwater sediments more research is still needed on factors affecting particle recoveries.
SUMMARY

    The compromise CaCl2 applied followedtoby removal of best organic matter byanalytical digestionprocedure-density in 1:1 H2O2:FeSO4 atseparation 30 °C for 6in h-was removal organicfreshwater matter by digestion in 1:1 H2 O2:FeSO4 at 30 ◦ C for 6 h-was applied to two locallyofsourced sediments. two locally sourced freshwater sediments. Microplastics were recovered from the two sediment samples in addition to those Microplastics were the two sediment samples method. in addition those deliberately added to recovered assess thefrom performance of the analytical Ontoaverage, deliberately added to assess the performance method. average, ± 4.3 ± 1.0 particle/10 g sediment (equivalentoftothe 430analytical particles/kg) wasOn found in the4.3 Black This 2.0represents ± 1.9 particle/10 g sediment particles/kg) in the White Cart.The This represents matematerial already (200 present at the time of sampling. higher microplastic rial already present at the time of sampling. This study compared five different flotation solutions and three different digestion reagents for the isolation of microplastics from simulated sediment matrices. When applied to spiked and unspiked freshwater sediment samples, the developed protocol performed well, recovering all of the added microplastics (except PTFE, which was partially recovered) and allowing the identification of a variety of additional microplastics that had accumulated in the sediments whilst in the environment on the riverbed. Whilst the method developed is suitable for general application in studies of microplastics in freshwater sediments, more research is still needed on factors affecting particle recoveries. Extraction efficiencies for post-consumer microplastics from real sediment samples of different compositions warrant detailed evaluation. @@

LAY DEFINITIONS
  • Consensus: A fundamental problem in distributed computing and multi-agent systems is to achieve overall system reliability in the presence of a number of faulty processes. This often requires coordinating processes to reach consensus, or agree on some data value that is needed during computation
  • Method: A series of steps taken in order to conduct research.
  • Microplastics: Plastic particles, less than 5 millimeters in diameter, that are generated from the degradation of larger pieces or are manufactured to be microstructures or smaller.
  • Polyethylene: Polyethylene or polythene (PE) is the most common plastic in use today. It is a linear, man-made, addition, homo-polymer, primarily used for packaging (plastic bags, plastic films, geomembranes, containers including bottles, etc.)
  • Polyvinyl fluoride: Polyvinyl fluoride (PVF) or u2013(CH2CHF)nu2013 is a polymer material mainly used in the flammability-lowering coatings of airplane interiors and photovoltaic module backsheets. It is also used in raincoats and metal sheeting
  • Freshwater: Water containing no significant amounts of salts, such as water from RIVERS and LAKES.

Licence: cc-by

Site reference: https://www.mdpi.com/2076-3298/11/7/146/pdf?version=1720766873

DOI reference: https://www.doi.org/10.3390/environments11070146

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source https://magazine.sciencepod.net/towards-a-consensus-method-for-the-isolation-of-microplastics-from-freshwater-sediments/

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