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In situ laboratory for plastic degradation in the Red Sea
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Researchers used microplastic pellets from a ship that sank 29 years ago as a natural laboratory to study how plastics degrade over time, finding that pellets submerged in saltwater showed almost no degradation while beach-exposed pellets broke down significantly. This confirms that UV sunlight and heat — not saltwater — are the main drivers of plastic fragmentation into smaller and smaller particles.
Degradation and fragmentation of plastics in the environment are still poorly understood. This is partly caused by the lack of long-term studies and methods that determine weathering duration. We here present a novel study object that preserves information on plastic age: microplastic (MP) resin pellets from the wreck of the SS Hamada, a ship that foundered twenty-nine years ago at the coast of Wadi el Gemal national park, Egypt. Its sinking date enabled us to precisely determine how long MP rested in the wreck and a nearby beach, on which part of the load was washed off. Pellets from both sampling sites were analyzed by microscopy, X-ray tomography, spectroscopy, calorimetry, gel permeation chromatography, and rheology. Most pellets were made of low-density polyethylene, but a minor proportion also consisted of high-density polyethylene. MP from inside the wreck showed no signs of degradation compared to pristine reference samples. Contrary, beached plastics exhibited changes on all structural levels, which sometimes caused fragmentation. These findings provide further evidence that plastic degradation under saltwater conditions is comparatively slow, whereas UV radiation and high temperatures on beaches are major drivers of that process. Future long-term studies should focus on underlying mechanisms and timescales of plastic degradation.
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Comparative long-term studies on the degradation of environmental microplastics under different abiotic conditions in a marine in situ laboratory
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Researchers conducted a 29-year study of plastic degradation using resin pellets from a shipwreck off Egypt, comparing plastics that had been exposed to beach conditions versus open-ocean conditions over nearly three decades. The results showed significant physical and chemical degradation under beach conditions while ocean-submerged plastics remained more intact, helping constrain realistic estimates of how long microplastic precursors persist in different marine environments.
Observation of the degradation of three types of plastic pellets exposed to UV irradiation in three different environments
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Researchers exposed three types of plastic pellets to UV light in seawater, freshwater, and air to observe how they degrade in different environments. They found that chemical changes like the formation of new molecular groups occurred at different rates depending on the surrounding medium, with air and freshwater conditions causing more chemical weathering. The study highlights that plastic degradation in the ocean follows different pathways than on land, which matters for understanding how microplastics form and persist in marine environments.
Simulated experimental investigation of microplastic weathering in marine environment
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Researchers simulated microplastic weathering under marine conditions, finding that exposure to UV light, saltwater, and mechanical abrasion progressively degraded plastic surfaces, increased surface roughness, and enhanced the adsorption capacity of contaminants onto microplastic particles.
Weathering Processand Characteristics of Microplasticsin Coastal Wetlands: A 24-Month In Situ Study
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Researchers conducted a 24-month study of microplastic weathering in coastal wetlands, characterizing how wetland-specific conditions including UV exposure, salinity, and biological activity alter plastic surface chemistry, fragmentation, and biofilm colonization over time.
Comprehensive Understanding on the Aging Process and Mechanism of Microplastics in the Sediment–Water Interface: Untangling the Role of Photoaging and Biodegradation
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Researchers examined how microplastics break down at the boundary between water and sediment in coastal wetlands, comparing the roles of sunlight-driven aging and biological degradation. They found that photoaging was the dominant process, accounting for over 55% of surface changes, and that biodegradable plastics aged faster than conventional ones. The study provides important insights into how microplastics transform in real-world coastal environments.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.