Identification of microplastics in wastewater samples by means of polarized light optical microscopy.

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ID: 76295
2019
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Ranked #16 of 403 articles by views in Environmental science and pollution research international

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Abstract
Many reports state the potential hazards of microplastics (MPs) and their implications to wildlife and human health. The presence of MP in the aquatic environment is related to several origins but particularly associated to their occurrence in wastewater effluents. The determination of MP in these complex samples is a challenge. Current analytical procedures for MP monitoring are based on separation and counting by visual observation or mediated with some type of microscopy with further identification by techniques such as Raman or Fourier-transform infrared (FTIR) spectroscopy. In this work, a simple alternative for the separation, counting and identification of MP in wastewater samples is reported. The presented sample preparation technique with further polarized light optical microscopy (PLOM) observation positively identified the vast majority of MP particles occurring in wastewater samples of Montevideo, Uruguay, in the 70-600 μm range. MPs with different shapes and chemical composition were identified by PLOM and confirmed by confocal Raman microscopy. Rapid identification of polyethylene (PE), polypropylene (PP) and polyethylene terephthalate (PET) were evidenced. A major limitation was found in the identification of MP from non-birefringent polymers such as PVC (polyvinylchloride). The proposed procedure for MP analysis in wastewater is easy to be implemented at any analytical laboratory. A pilot monitoring of Montevideo WWTP effluents was carried out over 3-month period identifying MP from different chemical identities in the range 5.3-8.2 × 10 MP items/m.
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sierra2019identificationenvironmental Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Sierra, Ignacio;Chialanza, Mauricio Rodríguez;Faccio, Ricardo;Carrizo, Daniel;Fornaro, Laura;Pérez-Parada, Andrés;
Journal Environmental science and pollution research international
Year 2019
DOI
10.1007/s11356-019-07011-y
URL
Keywords
microplastics wastewater water pollution raman microscopy polarized light optical microscopy

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