fig4
Figure 4. FTIR analysis of MP samples: (A) PA/modified; (B) LDPE; (C) PET; (D) PP; (E) HDPE; (F) Mixed polymer with excess ester stretching. PA: polyamide; FTIR: Fourier-transform infrared spectroscopy; MP: microplastic; LDPE: low-density polyethylene; PET: polyethylene terephthalate; PP: polypropylene; HDPE: high-density polyethylene.