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Identification of microplastics by FTIR and Raman microscopy : a novel silicon filter substrate opens the important spectral range below 1300 cm - 1 for FTIR transmission measurements

Title data

Käppler, Andrea ; Windrich, Frank ; Löder, Martin ; Malanin, Mikhail ; Fischer, Dieter ; Labrenz, Matthias ; Eichhorn, Klaus-Jochen ; Voit, Brigitte:
Identification of microplastics by FTIR and Raman microscopy : a novel silicon filter substrate opens the important spectral range below 1300 cm - 1 for FTIR transmission measurements.
In: Analytical and Bioanalytical Chemistry. Vol. 407 (2015) Issue 22 . - pp. 6791-6801.
ISSN 1618-2650
DOI: https://doi.org/10.1007/s00216-015-8850-8

Abstract in another language

The presence of microplastics in aquatic ecosystems is a topical problem and leads to the need of appropriate and reliable analytical methods to distinctly identify and to quantify these particles in environmental samples. As an example transmission, Fourier transform infrared (FTIR) imaging can be used to analyze samples directly on filters without any visual presorting, when the environmental sample was afore extracted, purified, and filtered. However, this analytical approach is strongly restricted by the limited IR transparency of conventional filter materials. Within this study, we describe a novel silicon (Si) filter substrate produced by photolithographic microstructuring, which guarantees sufficient transparency for the broad mid-infrared region of 4000–600 cm-1. This filter type features holes with a diameter of 10 μm and exhibits adequate mechanical stability. Furthermore, it will be shown that our Si filter substrate allows a distinct identification of the most common microplastics, polyethylene (PE), and polypropylene (PP), in the characteristic fingerprint region (1400–600 cm-1). Moreover, using the Si filter substrate, a differentiation of microparticles of polyesters having quite similar chemical structure, like polyethylene terephthalate (PET) and polybutylene terephthalate (PBT), is now possible, which facilitates a visualization of their distribution within a microplastic sample by FTIR imaging. Finally, this Si filter can also be used as substrate for Raman microscopy—a second complementary spectroscopic technique—to identify microplastic samples.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER133253
Institutions of the University: Research Institutions
Research Institutions > Research Centres
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology > Chair Animal Ecology I
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 01 Aug 2016 13:18
Last Modified: 01 Aug 2016 13:18
URI: https://eref.uni-bayreuth.de/id/eprint/33758