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Stimulated Raman microspectroscopy as a new method to classify microfibers from environmental samples.
Sergey P Laptenok1, Cecilia Martin2, Luca Genchi1
1Biological and Environmental Science and Engineering Division, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia.
Environmental Pollution (Barking, Essex : 1987)
|December 1, 2020
Summary
Stimulated Raman Scattering (SRS) microscopy offers a fast and reliable method for identifying environmental microfibers. This advanced technique can determine fiber origin, even after degradation, highlighting the need for precise plastic fiber quantification.
Area of Science:
- Environmental Science
- Analytical Chemistry
- Spectroscopy
Background:
- Microfibers are the most prevalent microparticles in the environment.
- Identifying microfibers is challenging due to their small size and light weight.
- Vibrational microspectroscopy is used, but struggles with small microfiber diameters.
Purpose of the Study:
- To present Stimulated Raman Scattering (SRS) microscopy as a method for fast and reliable microfiber classification.
- To assess the efficacy of SRS microscopy in analyzing microfibers from diverse environmental samples.
- To address challenges in microfiber analysis, particularly those from degraded sources.
Main Methods:
- Utilized Stimulated Raman Scattering (SRS) microscopy for microfiber analysis.
- Analyzed fibers from fish gastrointestinal tracts, deep-sea and coastal sediments, surface seawater, and drinking water.
- Evaluated the impact of acidic degradation on fiber identification.
Main Results:
- SRS microscopy enabled fast and reliable classification of microfibers.
- Degraded fibers from fish GIT were identifiable, allowing origin determination.
- The majority of analyzed environmental fibers were found to be of natural origin.
Conclusions:
- SRS microscopy is a sensitive and potentially faster alternative for microfiber identification.
- Advanced spectroscopic methods are crucial for accurate plastic fiber concentration estimation.
- Environmental microfibers are predominantly natural, contrary to some assumptions.
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