Interaction between polychlorinated biphenyls and dissolved organic matter of different molecular weights from natural and anthropic sources

Reyes, Tatiana I. Garrido; Crisosto, Jorge Eugenio Mendoza; Echeverria, Paula Stefanie Varela; Barrios, Enrique Gabriel Mejías; Salgado, Xosé Antón Álvarez

doi:10.1016/j.jenvman.2021.113645

Cited by 5 publications

(1 citation statement)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…DOM, a complex and heterogeneous mixture with redox activity, drives numerous environmental chemical processes . It has been shown that the complex structure and functional groups of DOM can interact with organic pollutants, influencing their environmental fate through various forms of adsorption, binding, and photosensitization. , Similarly, MPs, as pervasive organic contaminants, inevitably interact with DOM. Although previous studies mainly focused on how DOM responds and changes under the influence of MPs, , there is growing interest in the potential impact of DOM on MPs.…”

Section: Introductionmentioning

confidence: 99%

Molecular Weights of Dissolved Organic Matter Significantly Affect Photoaging of Microplastics

Pan,

Zhang,

Qiu

et al. 2024

Environ. Sci. Technol.

View full text Add to dashboard Cite

The fate of ubiquitous microplastics (MPs) is largely influenced by dissolved organic matter (DOM) in aquatic environments, which has garnered significant attention. The reactivity of DOM is reported to be greatly regulated by molecular weights (MWs), yet little is known about the effects of different MW DOM on MP aging. Here, the aging behavior of polystyrene MPs (PSMPs) in the presence of different MW fulvic acids (FAs) and humic acids (HAs) was systematically investigated. Under ultraviolet (UV) illumination, O/C of PSMPs aged for 96 h surged from 0.008 to 0.146 in the lower MW FA (FA <1kDa ) treatment, suggesting significant PSMP aging. However, FA exhibited a stronger effect on facilitating PSMP photoaging than HA, which can be attributed to the fact that FA <1kDa contains more quinone and phenolic moieties, demonstrating a higher redox capacity. Meanwhile, compared to other fractions, FA <1kDa was more actively involved in the increase of different reactive species yields by 50−290%, including •OH, which plays a key role in PSMP photoaging, and contributed to a 25% increase in electron-donating capacity (EDC). This study lays a theoretical foundation for a better understanding of the environmental fate of MPs.

show abstract