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Effect of marine ambient in the production of pollutants from the pyrolysis and combustion of a mixture of plastic materials
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Scientists soaked common plastics (like those in bottles and packaging) in seawater for a year to see if ocean exposure makes them release more toxic chemicals when burned. The good news: even after a year in the ocean, burning these plastics didn't produce meaningfully higher levels of dangerous compounds like dioxins and PCBs, the toxic byproduct levels stayed very low regardless of saltwater exposure. This matters because it suggests that ocean plastic waste, if later incinerated (say, after being collected from beach cleanups), doesn't pose a dramatically higher pollution risk than burning fresh plast
A mixture of polyethylene (PE), polyethylene-terephtalate (PET), polypropylene (PP) and Nylon was submerged in marine water during 12 moths. The chlorine content of these plastics was measured through the passing time. Thermobalance was used to look for differences in the thermal decomposition of the plastics during in that time interval. Degradation of PET, PP and Nylon produced changes in the weight loss curve, but behaviour of PE is confusing. Pyrolysis and combustion at 850 °C was finally performed to get knowledge of the possible differences in the emission of main gases, volatiles and semivolatiles including polycyclic aromatic hydrocarbons (PAHs), polychlorinated benzenes (ClBzs), polychlorinated phenols (ClPhs), polybrominated phenols (BrPhs), polychlorinated biphenyls (PCBs) and polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs). Results show that the emission of chlorinated species is somewhat not affected by the chlorine content of the plastics mix. The production of PCBs and PCDD/Fs was very low, under 4 pg WHO-TEQ/g.
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Influence of a suite of environmentally relevant conditions on PBT leaching from, and sorption to, marine microplastic debris
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Researchers examined how environmental conditions such as UV exposure, weathering, and saltwater affect the ability of marine microplastics to absorb or release persistent, bioaccumulative, and toxic (PBT) chemicals, finding that the type of plastic and its weathering history significantly influence how much chemical contamination it carries into the marine food web.
Effect of temperature and sunlight on the leachability potential of BPA and phthalates from plastic litter under marine conditions
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Researchers exposed six plastic polymer types to simulated marine conditions (UV and heat) for 140 days and measured the leaching of bisphenol A and phthalate plasticizers, finding that temperature and sunlight substantially increase the release of these endocrine-disrupting chemicals.
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.
Seeping plastics: Potentially harmful molecular fragments leaching out from microplastics during accelerated ageing in seawater
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Researchers conducted accelerated aging experiments on four common plastic types in seawater to study the chemical compounds they release as they degrade. The study found that aging microplastics leach potentially harmful molecular fragments into the surrounding water, demonstrating that microplastics are not inert pollutants but chemically reactive materials that release degradation byproducts over time.
Assessing the feasibility of ocean plastic waste as secondary feedstock for the production of base chemicals
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Scientists found a way to break down ocean plastic waste (instead of just burning it) into useful chemical building blocks that could be turned into new plastics or products, offering a potential recycling solution for the plastic clogging our oceans. However, the process only works well if the plastic is first cleaned up, since researchers detected contaminants like heavy metals and chlorine mixed in with the ocean debris that could cause problems if not removed. This matters because finding practical ways to reuse ocean plastic could help reduce the amount of plastic waste breaking down into microplastics in marine environments and our food chain.
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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.