equipped with an attenuated total reflectance (ATR) diamond crystal attachment in order to establish their reference spectra. Ranges of the spectra were set from 4000 to 500 cm−1, and the collection time was 16 s for each measurement.type of weathered plastic pellets (treated by different UV irradiation times, i.e., 1 month, 2 months and 3 months) were randomly selected and analyzed by FTIR spectroscopy. Three different points (i.e., the central point and two different edge points) of each sample were examined.