fig4

Figure 4. Spectrally determined (LDIR) elemental composition of MP detected in representative water samples from Great Bay Estuary. Panels show data for (A) Nannie Island August 2020; (B) Nannie Island April 2021; (C) Oyster River July 2020; and (D) Adams Point October 2020. LDIR: Laser direct infrared spectrometry; MP: microplastics.