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Uptake, Whole-Body Distribution, and Depuration of Nanoplastics by the Scallop Pecten maximus at Environmentally Realistic Concentrations
Version 2 2019-01-11, 00:43
Version 1 2018-11-28, 19:34
journal contribution
posted on 2018-12-18, 00:00 authored by Maya Al-Sid-Cheikh, Steve J. Rowland, Karen Stevenson, Claude Rouleau, Theodore B. Henry, Richard C. ThompsonPrevious studies of uptake and effects
of nanoplastics by marine
organisms have been conducted at what may be unrealistically high
concentrations. This is a consequence of the analytical challenges
in tracking plastic particles in organisms at environmentally relevant
concentrations and highlights the need for new approaches. Here, we
present pulse exposures of 14C-radiolabeled nanopolystyrene
to a commercially important mollusk, Pecten maximus, at what have been predicted to be environmentally relevant concentrations
(<15 μg L–1). Uptake was rapid and was
greater for 24 nm than for 250 nm particles. After 6 h, autoradiography
showed accumulation of 250 nm nanoplastics in the intestine, while
24 nm particles were dispersed throughout the whole-body, possibly
indicating some translocation across epithelial membranes. However,
depuration was also relatively rapid for both sizes; 24 nm particles
were no longer detectable after 14 days, although some 250 nm particles
were still detectable after 48 days. Particle size thus apparently
influenced the biokinetics and suggests a need for chronic exposure
studies. Modeling extrapolations indicated that it could take 300
days of continued environmental exposure for uptake to reach equilibrium
in scallop body tissues although the concentrations would still below
2.7 mg g–1. Comparison with previous work in which
scallops were exposed to nonplastic (silver) nanomaterials of similar
size (20 nm), suggests that nanoparticle composition may also influence
the uptake tissue distributions somewhat.
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exposure studies24 nmmarine organisms250 nm particlesPecten maximusmodeling extrapolations300 dayspulse exposuresEnvironmentally Realistic Concentrationsnanoparticle compositionplastic particlesParticle sizescallop body tissuesScallop Pecten maximusuptake tissue distributions250 nm nanoplastics14 daysconcentrationWhole-Body Distributionepithelial membranes14 C-radiolabeled nanopolystyrene48 days24 nm particles6 h
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