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Trace metal adsorption on plastic pellets and fibers in the marine and estuarine environment

Hereby, we studied the adsorption of trace metals on two forms of pre-production plastic products ubiquitous in the world oceans. Plastic pellets and fibers were deployed for six months in the estuarine and marine systems and analyzed afterwards. Trace metals (Cd, Cu, Pb, Zn, Ni and Co) were acid-leached from the deployed pellets and fibers and determined by cathodic and anodic stripping voltammetry by Metrohm Autolab modular potentiostat/galvanostat Autolab PGSTAT204, connected with a three-electrode system Metrohm 663 VA STAND. Working electrode used was static mercury drop electrode (SMDE). In general, higher amounts of trace metals were adsorbed on both forms of polymer samples in the marine system when compared to the estuarine, except in the case of Cd, where the highest amount was detected from estuarine pellet samples. Fibrous form collected highest amounts of Zn, Cd, Cu and Ni, while the pellets deployed in estuarine environment adsorbed higher amounts of Pb and Co. The determined mass fractions of trace metals in both systems were similar to the values found in literature.

Microplastics ; trace metals ; voltammetry ; marine ; estuarine ; adsorption

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