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Preliminary insights into the release behavior of dissolved organic matter from aged microplastics in seawater: Effects of aging types
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When plastic bits break down in the ocean from sunlight and algae/bacteria growth, they don't just fall apart into smaller pieces—they also leak dissolved chemical compounds into the water, and this study found that plastics exposed to *both* sunlight and biological growth release far more of these compounds than plastics exposed to just one. This matters because these released substances become part of the seawater chemistry that marine life is exposed to, and since we eat seafood, understanding how plastics break down in the ocean helps scientists better predict what ends up in our food chain. This is early-stage lab research, though, so more work is needed to understand the real-
Microplastics (MPs) entering the ocean experience multiple aging driven by photochemical and biological processes, resulting in substantial release of dissolved organic matter (DOM). However, limited attention has been paid to the differences and correlations in the influences of ultraviolet irradiation (UV), biofilm formation (Bio), and their coupled process (Bio-UV) on the release behavior of MP-DOM in complex marine environments. Herein, polyethylene terephthalate (PET)-MPs, as commonly encountered plastic particles in marine environments, were first subjected to UV-, Bio- and coupled Bio-UV aging, and then leached in artificial seawater for 10 days. The collected MP-DOM was analyzed in terms of the contents and optical characteristics. The results showed that three aging processes led to obviously different alterations in MPs surface properties, including morphological changes, decreased hydrophobicity, and accumulation of biomass. During seawater immersion, Bio-UV-MPs experienced much higher release of DOM than others, presenting the synergistic promoting effect of UV- and Bio-aging on the release of MP-DOM. According to spectroscopic analysis, the DOM from UV-MPs and Bio-MPs had their own specific humic-like components, which were derived from UV oxidation and biofilm formation respectively, and fluorescent component composition for Bio-UV-MPs resembled Bio-MPs. The results indicated that Bio-aging process may impair the potential contribution of prior UV-aging to the fluorescence components. This study elucidates the distinct effects of aging types on the release behavior of MP-DOM, thereby advancing our understanding of the environmental fate of MPs and their derivatives in complex marine environments.
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Advancing understanding of microplastics-derived dissolved organic matter release: From source-dependent behavior to micro-interfacial processes
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Researchers compared dissolved organic matter released by microplastics from river-collected versus newly purchased plastics under UV aging, finding that environmentally pre-aged plastics released chemically more oxidized DOM while fresh plastics preferentially shed higher-molecular-weight, aromatic humic-like compounds — with salinity amplifying these source-dependent differences in seawater conditions.
The intermolecular differences in dissolved organic matter derived from microplastics during photo-aging and photo-bio-aging processes
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Researchers compared dissolved organic matter released from microplastics during photo-aging alone versus combined photo-biological aging in seawater, finding that combined aging produced DOM with distinct molecular characteristics including greater aromaticity and more complex intermolecular structures.
The environmental effects of microplastics and microplastic derived dissolved organic matter in aquatic environments: A review
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This review examines how microplastics interact with other pollutants in water and how aging from sunlight and weathering changes their behavior. As microplastics break down, they release dissolved organic matter and develop surface changes that increase their ability to carry harmful chemicals like pesticides and pharmaceuticals. The findings suggest that weathered microplastics in real-world environments may be more dangerous than fresh plastics used in most lab studies.
Aging dynamics and subsequent dissolved organic matter evolution of microplastics regulated by UV-salinity conditions.
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A lab study exposed common plastics (polyethylene, polypropylene) and a biodegradable plastic (polylactic acid) to sunlight-like UV and different salt levels for 60 days. UV light caused more breakdown in all plastics, and higher salinity worsened this for the conventional plastics, while the biodegradable plastic broke down through a different process and released more dissolved material.
Molecular-level insights into the heterogeneous variations and dynamic formation mechanism of leached dissolved organic matter during the photoaging of polystyrene microplastics
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Researchers investigated the molecular-level changes that occur when polystyrene microplastics break down under light exposure and release dissolved organic matter into water. They found that the released molecules were highly diverse and changed dynamically over the course of aging, with different chemical classes appearing at different stages. The study provides new insight into how degrading microplastics introduce complex mixtures of organic chemicals into aquatic environments.
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