Monitorization of Polyamide Microplastics Weathering Using Attenuated Total Reflectance and Microreflectance Infrared Spectrometry
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Monitorization of Polyamide Microplastics Weathering Using Attenuated Total Reflectance and Microreflectance Infrared SpectrometryAuthor(s)
Date
2021-07-10Citation
Verónica Fernández-González, Jose Manuel Andrade, Borja Ferreiro, Purificación López-Mahía, Soledad Muniategui-Lorenzo, Monitorization of polyamide microplastics weathering using attenuated total reflectance and microreflectance infrared spectrometry, Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, Volume 263, 2021, 120162, ISSN 1386-1425, https://doi.org/10.1016/j.saa.2021.120162. (https://www.sciencedirect.com/science/article/pii/S1386142521007393)
Abstract
[Abstract] The EU goal to reduce marine plastic litter by ca. 30% by 2020 stressed the need to deploy analytical methods to ascertain the polymeric nature of a residue. Furthermore, as plastics age under natural conditions and usual databases do not include their weathered spectra, (micro)plastics in environmental samples may be unidentified. In this paper, polyamide (nylon) microplastics weathering was monitored because of its ubiquity in household commodities, clothes, fishery items and industry, whose residues end up frequently in the environment. Infrared spectra (ATR and microreflectance) and Scanning Electron Microscopy (SEM) images were collected periodically while exposing nylon to controlled weathering. It was seen that ATR was more sensitive than microreflectance to monitor the structural evolution of polyamide and that the spectra and the surface of weathered microplastics showed remarkable differences with the pristine material, which stresses the need for considering its evolution when identifying microplastics in environmental studies. The evolution of six band ratios related to the chemical evolution of this polymer are presented. SEM images revealed the formation of secondary microplastics at the most advanced weathering stages of polyamide.
Keywords
Polyamide 6.6
Nylon
Photooxidation
Weathering
Microplastic
Marine environment
Nylon
Photooxidation
Weathering
Microplastic
Marine environment
Description
Financiado para publicación en acceso aberto: Universidade da Coruña/CISUG
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Rights
Atribución-NoComercial-SinDerivadas 4.0 Internacional
ISSN
1386-1425