We present a blue mussel exposure system where the fate of microplastics (polystyrene beads) is tracked during exposure and depuration phases. This enabled the establishment of a complete mass balance. Quantification of beads in mussels was done with a novel enzymatic digestion protocol. We found a similar relative distribution of beads for 2 environmentally realistic concentrations (5 and 100 beads L ) and no substantial egestion of particles within 2 h of depuration. Environ Toxicol Chem 2019;38:99-105. © 2018 SETAC.
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