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Adsorption of Cd and Cu to different types of microplastics in estuarine salt marsh medium
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This study compared cadmium and copper adsorption onto three types of microplastics (polyethylene microspheres, fishing nets, and packaging film) in an estuarine salt marsh medium, finding that plastic type significantly influenced metal sorption capacity. The results suggest that different microplastic debris items in coastal environments may pose varying risks for heavy metal transport.
This study aimed to investigate if microplastics (MPs) type (polyethylene microspheres (mPE), fishing line fibers, film plastic bags MPs and bottle cap particles) and aging affect MPs capacity to sorb Cd or Cu in estuarine salt marsh medium. Tests were carried out in elutriate solution, a simple medium obtained by mixing rhizosediment (sediment in contact with plants roots) with the respective estuarine water, that can be used to simulate water-sediment exchanges in estuarine salt marsh environments. After 7 days of exposure, metals adsorption was only detected for film MPs. No differences were observed between virgin and aged MPs. Salinity also did not influence metal adsorption to mPE. Present results indicate that in estuarine salt marsh areas some types of MPs might adsorb metals, which could affect metals availability.
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