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Characterising microplastics in shower wastewater with Raman imaging
Yunlong Luo1, Christopher T Gibson2, Youhong Tang3
1Global Centre for Environmental Remediation (GCER), University of Newcastle, Callaghan, NSW 2308, Australia; Cooperative Research Centre for Contamination Assessment and Remediation of the Environment (CRC CARE), University of Newcastle, Callaghan, NSW 2308, Australia.
Raman imaging effectively identifies microplastic fibers in shower wastewater, distinguishing them from natural fibers and dirt. This technique simplifies sample preparation and allows for simultaneous colorant bleaching during analysis.
Area of Science:
- Environmental Science
- Analytical Chemistry
- Materials Science
Background:
- Microplastics are released during daily activities, posing environmental challenges.
- Characterizing microplastics in complex samples like shower debris is difficult.
Purpose of the Study:
- To employ Raman imaging for direct visualization and characterization of microplastics in shower wastewater.
- To assess the efficacy of Raman imaging in distinguishing microplastic fibers from other components in shower debris.
Main Methods:
- Raman imaging was used to map microplastics in collected shower wastewater debris.
- Spectra were collected from a scanning array, enhancing signal-to-noise ratio.
- In-situ bleaching of colorants was achieved by adjusting laser power during scanning.
Main Results:
- Raman imaging successfully distinguished microplastic fibers from cotton fibers and dirt aggregates.
- The enhanced signal-noise ratio simplified sample preparation.
- Simultaneous in-situ bleaching and signal collection were demonstrated.
Conclusions:
- Raman imaging is a powerful tool for analyzing microplastics in complex environmental samples.
- The technique offers high specificity and efficiency for microplastic identification.
- Despite limitations like short working distance, Raman imaging provides valuable insights into microplastic pollution from domestic sources.
