Fig. 1

An overview of experimental setup. A One of the three mesocosm fibreglass tanks with suspended nylon mesh bags containing the plastic units. B One of the three storage containers used to carry out serial incubations, with river water incubation tank. C Nylon mesh bag layout. Each bag contained 12 experimental units of one plastic type (HDPE, LDPE, PET or PP). D Schematic of the experimental design where plastic was incubated in WWTP effluent, river water, brackish water and seawater to simulate the pathway plastic takes from WWTP to a marine environment