Fig. 4

FT-IR spectra and photographs of the samples. (a) and (f) are transparent microplastics, (b) and (g) are translucent microplastics, (c) and (h) are black microplastics, (d) and (i) are fresh plastic mulch, (e) and (j) are polyethylene powder (X in FT-IR spectra represents halogen).