AI Article Synopsis
- Rising plastic use has led to microplastic contamination, and Raman spectroscopy is a key method for identifying these particles, though it struggles with interference from pigments and additives in colored samples.
- This study evaluates how effective various oxidative treatments (like HO, sodium hypochlorite, and Fenton's reagent) are at reducing these interferences and improving the accuracy of Raman spectroscopy in identifying colored microplastics.
- Findings indicate that colorants, especially red pigments, can significantly hinder polymer identification, and current treatment methods do not effectively enhance accuracy; thus, improved strategies and technology are needed for better results.
Article Abstract
Rising plastic consumption leads to widespread microplastic (MP) contamination. Raman spectroscopy is widely used for MP identification due to its ability to analyse particles as small as 1 μm. However, it faces challenges such as interference from pigments and additives. In this study, we aim to assess the accuracy of Raman micro-spectroscopy in identifying coloured plastic samples by applying various oxidative treatments to eliminate the possible interference effect caused by colourants associated with the sample. Standard and coloured microplastics were analysed using a Raman imaging microscope. Coloured plastics were treated with HO 30%, Sodium hypochlorite 5%, and Fenton reagent (H2O2 30% and Ferrous sulphate 0.2 M) for 24, 48, and 72 h. The Raman spectra were acquired after treatment to assess the impact of the treatment procedure on the polymer identification. Our results revealed that colourants significantly impact Raman spectra by peak broadening and/or fluorescence effects, which reduces identification accuracy and match scores Red pigments particularly obscure polymer identification. Treatments like oxidation and Fenton's reagent showed limited effectiveness. Additives in plastic samples can affect the accuracy of polymer identification by the Raman spectroscopy technique. Common treatment procedures do not improve the accuracy of identification. In order to improve the reliability of Raman analysis, essential factors such as utilizing multiple excitation lasers and appropriate CCD detectors, establishing a comprehensive reference library of colourants and additives, and employing advanced techniques like time-gated Raman spectroscopy or Surface-Enhanced Raman Spectroscopy (SERS) should be considered.
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| http://dx.doi.org/10.1016/j.envpol.2024.125250 | DOI Listing |
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