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Warming exponentially stimulates photoleaching of dissolved organic matter from multiple microplastics
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Researchers quantified dissolved organic matter release from four common marine microplastics (PE, PP, PET, PVC) under UV light at temperatures ranging from 10–35°C, finding that warming exponentially increased photoleaching rates — with implications for how climate change may accelerate microplastic-derived carbon cycling in ocean surface waters.
The substantial release of microplastics (MPs) into the marine environment is now deeply integrated into Earth's carbon cycle. However, the mechanisms by which warming regulates the release of MP-leached dissolved organic matter (MP-DOM) in seawater media remain highly uncertain. This work considers four typical MPs that enter the ocean (polyethylene, PE; polypropylene, PP; polyethylene terephthalate, PET; and polyvinyl chloride, PVC) over 1-week experiments under UV light and dark conditions at a narrow temperature interval of 5 °C between10-35 °C. The results indicate that different MPs have variable photoleaching rates of dissolved organic carbon (MP-DOC, 0.06 ± 0.01-0.61 ± 0.07 mg-C/g-MP/week) and fluorescent DOM (MP-FDOM). An unexpected inconsistency emerged in the photoleaching of MP-DOC and MP-FDOM, with dominant MP-DOC release for PE, PP and PVC, while PET showed substantial release of both. The humification index and biological index pair is a useful indicator to distinguish MP-DOM versus natural DOM. The Q values, which reflect the temperature sensitivity of MP-DOC photoleaching, ranged from 1.62 (PVC) to 1.93 (PET) indicating an exponential increase in MP-DOC leaching rates with rising temperature. These findings highlight the need for incorporating ocean warming into predicting the effects of plastic pollution on the marine carbon cycle.
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Researchers found that solar radiation causes microplastics to release dissolved organic matter into seawater, with low-density polyethylene releasing about five times more carbon per gram per day than polystyrene. The released organic compounds included nitrogen- and sulfur-containing molecules, and a portion overlapped with compounds found naturally in coastal waters. Incubation experiments showed that microbes could utilize 9-19% of this plastic-derived organic matter within 30 days, suggesting it becomes part of the marine carbon cycle.
Photodissolution of submillimeter-sized microplastics and its dependences on temperature and light composition
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Researchers examined how temperature and light wavelength affect photodissolution of polypropylene, polystyrene, and thermoplastic polyurethane microplastics in seawater, finding that UVB radiation exclusively drives dissolution, that a 20°C temperature increase can enhance dissolved organic carbon production by 3–10 times depending on polymer, and that estimated lifetimes for these plastics in warm surface waters range from 3.6 to 6.5 years.
Impacts of climatic stressors on dissolved organic matter leaching from microplastics and their effects on biogeochemical processes: A review
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This review examines how microplastics release dissolved organic matter as they break down in the environment, and how climate change may accelerate this process. The chemicals leached from degrading plastics can disrupt microbial communities and natural nutrient cycles, potentially increasing greenhouse gas production and altering the ecosystems that ultimately support our food and water supplies.
Photochemical dissolution of buoyant microplastics to dissolved organic carbon: Rates and microbial impacts
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Common ocean surface microplastics (PE, PP, EPS) were irradiated under simulated sunlight, which fragmented and oxidized the polymers and produced dissolved organic carbon as a significant byproduct. The study identifies sunlight-driven photochemical dissolution as an important but poorly quantified removal mechanism for buoyant microplastics from the ocean surface.
Deciphering fluorescent and molecular fingerprint of dissolved organic matter leached from microplastics in water
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Scientists studied how different types of microplastics release dissolved organic matter into water, finding that UV sunlight dramatically increased the release from PET plastics by 25 times over seven days. The chemical fingerprint of the released compounds differed between PET and polyethylene plastics, with UV exposure making PET compounds harder to break down. This research matters because these leached chemicals can change water quality and may carry additional health risks beyond the plastic particles themselves.
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