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• W3113764253 endingPage "116775" @default.
• W3113764253 startingPage "116775" @default.
• W3113764253 abstract "Despite numerous studies on microplastics (MPs), little attention has been paid to the dissolved organic substances leached from MPs and their environmental fate. In this study, we explored the copper-binding characteristics of MP-derived dissolved organic matter (MP-DOM) leached from several MP types, including commercial polypropylene, polyvinylchloride, and expanded polystyrene, under dark and UV irradiation conditions. The copper-binding affinity of MP-DOM was examined using fluorescence quenching method based on different fluorophores identified via the excitation emission matrix-parallel factor analysis (EEM-PARAFAC). The heterogeneous distribution of binding sites across the functional groups of MP-DOM was further elucidated by utilizing two-dimensional correlation spectroscopy (2D-COS) based on Fourier transform infrared spectroscopy (FTIR). Phenol/protein-like fluorescence prevailed in all MP-DOM samples, whereas humic-like fluorescence was more pronounced in the irradiated MP-DOM. For all tested plastic types, two plastic-derived fluorescent components (C2 and C3) exhibited substantial fluorescence quenching with increasing copper concentrations. The calculated stability constants showed larger differences between the two leaching conditions than between the three MP types with higher log KM values for the UV-irradiated (4.08–5.36) than dark-treated MP-DOM (1.05–3.60). The binding constants were comparable to those of natural organic matter with aquatic/terrestrial origins. The 2D-COS results further revealed that the oxygen-containing structures in MP-DOM generated by UV irradiation might be responsible for the higher binding affinity of the irradiated MP-DOM. This is the first study demonstrating the environmental reactivity of MP-DOM towards metal binding, highlighting the importance of leaching conditions for the metal-binding behavior of MP-DOM." @default.
• W3113764253 created "2021-01-05" @default.
• W3113764253 creator A5000908376 @default.
• W3113764253 creator A5005221634 @default.
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• W3113764253 date "2021-02-01" @default.
• W3113764253 modified "2023-10-14" @default.
• W3113764253 title "Copper-binding properties of microplastic-derived dissolved organic matter revealed by fluorescence spectroscopy and two-dimensional correlation spectroscopy" @default.
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• W3113764253 doi "https://doi.org/10.1016/j.watres.2020.116775" @default.
• W3113764253 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/33385874" @default.
• W3113764253 hasPublicationYear "2021" @default.
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