Analysis of spectral characteristics and applicability of μ-Raman and ATR-μ-FTIR in detecting small-sized microplastics
At present,the mainstream qualitative detection methods for microplastics include attenuated total reflection micro-Fourier transform infrared spectroscopy(ATR-μ-FTIR)and micro-Raman spectros-copy(μ-Raman).In order to better determine the applicability of these two methods for detecting micro-plastics with small particle sizes and different compositions,this study took 13 types of microplastics such as ABS,PS and PP as examples and prepared submicron-sized microplastics.The research involved the optimization of μ-Raman detection methods for small-sized microplastics,including substrate selection,ad-justment of laser wavelength,and laser irradiation time to reduce fluorescence interference.Simultaneous-ly,the spectral characteristics of microplastics with different compositions detected by μ-Raman and ATR-μ-FTIR were compared.The results showed that the minimum particle size for microplastic detection using micro-Raman was between0.7～2.5 μm,while for microplastic detection using attenuated total reflection micro-Fourier-transform infrared spectroscopy,it ranged from 10 μm to 20 μm.Microplastics containing aromatic rings were found to be more suitable for μ-Raman detection,with 20 μm identified as the bound-ary for selecting microplastic component identification methods.This study provides reference information for the detection of small-sized microplastics.
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