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Enhanced adsorption and cytotoxicity of hydrothermally aged microplastics for volatile organic compounds in sludge
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Hydrophobic organic chemicals (HOCs) including persistent pollutants desorb from irregularly shaped polyethylene and polypropylene microplastic fragments in seawater at rates predictable from simple geometric approximations of particle size. This matters because microplastics act as mobile carriers of toxic chemicals, and understanding desorption kinetics helps assess how much contamination is released into marine food webs.
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Hydrothermal treatment of sewage sludge microplastics reduced their release of bisphenol A and phenol compared to untreated microplastics, while sludge components enhanced adsorption of these endocrine-disrupting chemicals onto the microplastic surface. This is important because sludge is widely applied to agricultural land as fertilizer, and microplastics in sludge act as carriers that can mobilize endocrine disruptors into soils, crops, and ultimately human food and water.
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