Authors
Fangyuan Cheng, Hao Yang, Jingshuang Cui, Jiao Qu, Ya-Nan Zhang, Weihua Song
Published in
Environmental science & technology. Volume 60. Issue 44. Pages 31971-31980. Nov 10, 2026.
Abstract
Microplastic-derived dissolved organic matter (MP-DOM) is emerging as a non-negligible organic input to marine systems, yet how its interactions with seawater DOM (S-DOM) regulate the photochemical formation of reactive bromine species (RBS) remains unclear. In this study, the RBS formation potential of poly(vinyl chloride) (PVC)-derived MP-DOM, S-DOM, and their mixed systems was systematically investigated under simulated solar irradiation. MP-DOM input exerted a nonlinear ratio-dependent regulatory effect on S-DOM-mediated RBS formation. At relatively low MP-DOM proportions (5-20%), the formation rate constant of 4-bromo-3,5-dimethyl-1H-pyrazole (Br-DMPZ), which represents the RBS formation potential, increased relative to S-DOM alone, reaching a maximum enhancement of 47.4% at 20% MP-DOM under seawater halide ion conditions (540 mM Cl- + 0.8 mM Br-). This enhancement was associated with increased quinone-/carbonyl-related redox-active structures, electron exchange capacity, and tannin-like components, which could facilitate photoinduced charge separation, electron transfer, and Br- oxidation. In contrast, higher MP-DOM proportions (40-50%) promoted hydrophobic lipid-like mixed assemblies, enhancing excited-state quenching and suppressing electron transfer and RBS photogeneration. These findings demonstrate that MP-DOM is not an inert byproduct of microplastic aging but rather an important regulatory factor in S-DOM-mediated halogen photochemistry in plastic-impacted marine waters.
PMID:
43007211
Bibliographic data and abstract were imported from PubMed on 10 Nov 2026.
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