![]() Careful selection of search parameters and the choice of spectra acquisition method were found to be essential for optimization of the library search results. Library search was employed and results show significant differences in the identification rate depending on the acquisition method of the spectra. Spectra acquired by transmission microscopy, attenuated total reflection (ATR) microscopy, and ATR spectroscopy were compared. To assess the plausibility of such findings, both natural and man-made fibers were examined using FT-IR spectroscopy. This work was sparked by the reported identification of man-made cellulosic fibers (rayon/viscose) in the marine environment as a major fraction of plastic litter by Fourier transform infrared (FT-IR) transmission spectroscopy and library search.
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