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  • Identification of microplas...
    Araujo, Catarina F.; Nolasco, Mariela M.; Ribeiro, Antonio M.P.; Ribeiro-Claro, Paulo J.A.

    Water research (Oxford), 10/2018, Volume: 142
    Journal Article

    Widespread microplastic pollution is raising growing concerns as to its detrimental effects upon living organisms. A realistic risk assessment must stand on representative data on the abundance, size distribution and chemical composition of microplastics. Raman microscopy is an indispensable tool for the analysis of very small microplastics (<20 μm). Still, its use is far from widespread, in part due to drawbacks such as long measurement time and proneness to spectral distortion induced by fluorescence. This review discusses each drawback followed by a showcase of interesting and easily available solutions that contribute to faster and better identification of microplastics using Raman spectroscopy. Among discussed topics are: enhanced signal quality with better detectors and spectrum processing; automated particle selection for faster Raman mapping; comprehensive reference libraries for successful spectral matching. A last section introduces non-conventional Raman techniques (non-linear Raman, hyperspectral imaging, standoff Raman) which permit more advanced applications such as real-time Raman detection and imaging of microplastics. Display omitted •Raman is the method of choice for identifying small microplastics (<20 μm).•Automated mapping routines and library matching allow fast microplastic detection.•Nonlinear Raman techniques enable real-time monitoring of microplastics.