Figure 3

Baseline-corrected FT-IR spectrum of microplastic particle in water samples (top panel) particle and comparison reference spectra for standard forms of polystyrenes (the most common commercial forms). The percentage match for the three reference forms were: (1) 95.15% for Polystyrene Standard, typical MW 200.000 (HR Aldrich FT-IR Collection 1, (2) 91.40% for Polystyrene Standard, typical MW 50.000 (HR Aldrich FT-IR Collection 1, and (3) 90.36% for Polystyrene Atactic (Hummel Polymer Sample Library).