|
Title
|
|
|
|
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
| |
|
Author
|
|
|
|
| |
|
Abstract
|
|
|
|
| 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. |
| The main driver of the potential toxicity of micro- and nanoplastics toward 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 have obvious consequences for the uptake/release kinetics and, thus, the bioavailability of compounds associated with plastic particles. Herein, we develop a theoretical framework to describe the uptake and release kinetics of metal ions and organic compounds by plastic particles and apply it to the 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 plastic reactivity toward aquatic contaminants and demonstrate the paramount importance of intraparticulate contaminant diffusion. |
| |
|
Language
|
|
|
|
English
| |
|
Source (journal)
|
|
|
|
Environmental science and technology / American Chemical Society. - Easton, Pa
| |
|
Publication
|
|
|
|
Easton, Pa
:
2023
| |
|
ISSN
|
|
|
|
0013-936X
[print]
1520-5851
[online]
| |
|
DOI
|
|
|
|
10.1021/ACS.EST.3C05148
| |
|
Volume/pages
|
|
|
|
57
:43
(2023)
, p. 16552-16563
| |
|
ISI
|
|
|
|
001092703300001
| |
|
Pubmed ID
|
|
|
|
37856883
| |
|
Full text (Publisher's DOI)
|
|
|
|
| |
|
Full text (open access)
|
|
|
|
| |
|