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Nile red staining in microplastic analysis—proposal for a reliable and fast identification approach for large microplastics

  • Elena HengstmannEmail author
  • Elke Kerstin Fischer
Article
  • 65 Downloads

Abstract

A variety of methods concerning the identification of microplastics in environmental samples exist. While visual identification is often used, implemented easily, and cost-efficient but implying biased results, spectroscopic or chromatographic approaches are reliable but time-consuming and need specific equipment. Nile red staining is an available alternative and complement method for identifying microplastics. In this study, Nile red staining and subsequent photographing in a UV light photobox was tested on its reliability and feasibility. The approach was compared with a second identification process using again staining but a fluorescence microscope. Selected identified microplastic particles were analyzed by μ-Raman spectroscopy to prove their polymeric origin. The results show that the presented approach is faster compared with the use of a fluorescence microscope or μ-Raman spectroscopy. Furthermore, it is cost-effective as well as accurate for large microplastics > 0.63 mm and, therefore, may be applied when large sample volumes need to be analyzed.

Graphical abstract

Keywords

Microplastics Identification Monitoring Nile red staining 

Notes

Acknowledgments

We thank the “Evangelisches Studienwerk Villigst” for their grant and Grace Swanson for the language revision of our manuscript.

Funding information

This study was partly funded by “Evangelisches Studienwerk Villigst”.

Compliance with ethical standards

This article does not contain any studies with human participants or animals performed by any of the authors.

Conflict of interest

The authors declare that they have no conflict of interest.

Supplementary material

10661_2019_7786_MOESM1_ESM.pdf (635 kb)
ESM 1 (PDF 634 kb)

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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.Center for Earth System Research and Sustainability (CEN)Universität HamburgHamburgGermany

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