Publikation:
A reference methodology for microplastic particle size distribution analysis: Sampling, filtration, and detection by optical microscopy and image processing

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dc.contributor.authorRichter, Susanne
dc.contributor.authorHorstmann, Julia
dc.contributor.authorAltmann, Korinna
dc.contributor.authorBraun, Ulrike
dc.date.accessioned2024-06-16T12:49:46Z
dc.date.available2024-06-16T12:49:46Z
dc.date.issued2022
dc.description.abstractMicroplastic (MP) contamination in natural water circulation is a concern for environmental issues and human health. Various types of polymer materials have been identified and were detected in MP analytic test procedures. Beyond MP polymer type, particle size and form play a major role in water analysis due to possible negative toxicologic effects on flora and fauna. However, the correct quantitative measurement of MP size distribution over several orders of magnitude is strongly influenced by sample preparation, filtration materials and processes, and microanalytical techniques, as well as data acquisition and analysis. In this paper, a reference methodology is presented aiming at an improved quantitative analysis of MP particles. An MP analysis workflow is demonstrated including all steps from reference materials to sample preparation, filtration handling, and MP particle size distribution analysis. Background-corrected particle size distributions (1â€Ì1000†Ìm) have been determined for defined polyethylene (PE) and polyethylene terephthalate (PET) reference samples. Microscopically measured particle numbers and errors have been cross-checked with the total initial mass. In particular, defined reference MP samples (PE, PET) are initially characterized and applied to filtration experiments. Optical microscopy imaging on full-area Si filters with subsequent image analysis algorithms is used for statistical particle size distribution analysis. To quantify the effects of handling and filtration, several blind tests with distilled water are carried out to determine the particle background for data evaluation. Particle size distributions of PE and PET reference samples are qualitatively and quantitatively reproduced with respect to symmetry, and maximum and cut-off diameter of the distribution. It is shown that especially MP particles with a radius of >50†Ìm can be detected and retrieved with high reliability. For particle sizes <50†Ìm, a significant interference with background contamination is observed. Data from blank samples allows a correction of background contaminations. Furthermore, for enhanced sampling statistics, the recovery of the initial amount of MP will be qualitatively shown. The results are intended as an initial benchmark for MP analytics quality. This quality is based on statistical MP particle distributions and covers the complete analytic workflow starting from sample preparation to filtration and detection. Microscopic particle analysis provides an important supplement for the evaluation of established spectroscopic methods such as Fourier-transform infrared spectroscopy or Raman spectroscopy. © 2022 The Authorsen
dc.format.extent1 Onlineresource (10 pages)
dc.format.mediumonline resource
dc.identifier.doihttps://doi.org/10.60810/openumwelt-950
dc.identifier.urihttps://openumwelt.de/handle/123456789/1910
dc.language.isoeng
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/
dc.titleA reference methodology for microplastic particle size distribution analysis: Sampling, filtration, and detection by optical microscopy and image processing
dc.typeWissenschaftlicher Artikel
dc.type.dcmitext
dc.type.mediumcomputer
dspace.entity.typePublication
local.bibliographicCitation.journalTitleApplied research
local.bibliographicCitation.originalDOI10.1002/appl.202200055
local.bibliographicCitation.volume(2022) vom 19.11.2022
local.collectionAufsätze
local.contributor.authorId02192161
local.contributor.authorId02192162
local.contributor.authorId02172957
local.contributor.authorId00270121
local.identifier.catalogId02498547
local.ingest.leader06373naa a2200000uu 4500
local.jointTitleA REFERENCE METHODOLOGY FOR MICROPLASTIC PARTICLE SIZE DISTRIBUTION ANALYSIS SAMPLING FILTRATION AND DETECTION BY OPTICAL MICROSCOPY AND IMAGE PROCESSING
local.reviewtrue
local.sourcecatalog
local.source.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/deed.de
local.staffPublicationtrue
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