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Title
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Effect of polymer aging on uptake/release kinetics of metal ions and organic molecules by micro- and nanoplastics : implications for the bioavailability of the associated compounds
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Author
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Abstract
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| The main driver of the potential toxicity of micro- and nanoplastics towards biota is often the release of compounds initially present in the plastic, i.e. polymer additives, as well as environmentally acquired metals and/or organic contaminants. Plastic particles degrade in the environment via various mechanisms and at different rates, depending on the particle size/geometry, polymer type, and the prevailing physical and chemical conditions. The rate and extent of polymer degradation has obvious consequences for the uptake/release kinetics and thus bioavailability of compounds associated with plastic particles. Herein we develop a theoretical framework to describe the uptake/release kinetics of metal ions and organic compounds by plastic particles and apply it to analysis of experimental data for pristine and aged micro- and nanoplastics. In particular, we elucidate the contribution of transient processes to the overall kinetics of plastics reactivity towards aquatic contaminants and demonstrate the paramount importance of intraparticulate contaminant diffusion. |
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Language
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English
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Source (journal)
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Environmental science and technology / American Chemical Society. - Easton, Pa
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Publication
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Easton, Pa
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2023
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ISSN
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0013-936X
[print]
1520-5851
[online]
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DOI
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10.1021/ACS.EST.3C05148
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Volume/pages
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57
:43
(2023)
, p. 16552-16563
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ISI
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001092703300001
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Pubmed ID
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37856883
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Full text (Publisher's DOI)
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Full text (open access)
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