%0 Journal Article %T Microstructure Characterization of Oceanic Polyethylene Debris %+ Interactions moléculaires et réactivité chimique et photochimique (IMRCP) %+ Institut de Chimie Physique (ICP) %+ Institut photonique d'analyse non-destructive européen des matériaux anciens (IPANEMA) %+ Centre de Microscopie Électronique Appliquée à la Biologie (CMEAB) %+ Laboratoire Chimie de l'environnement (LCE) %+ Laboratoire de Chimie, Catalyse, Polymères et Procédés, R 5265 (C2P2) %+ Laboratoire Charles Coulomb (L2C) %+ IDeAS - Interfaces Dynamiques et Assemblages Stimulables (IDeAS) %+ SMODD - Systèmes Moléculaires Organisés et Développement Durable (SMODD) %A Rowenczyk, Laura %A Dazzi, Alexandre %A Deniset-Besseau, Ariane %A Beltran, Victoria %A Goudounèche, Dominique %A Wong-Wah-Chung, Pascal %A Boyron, Olivier %A George, Matthieu %A Fabre, Pascale %A Roux, Clément %A Mingotaud, Anne-Françoise %A ter Halle, Alexandra %< avec comité de lecture %Z ICPO_BIO %@ 0013-936X %J Environmental Science and Technology %I American Chemical Society %V 54 %N 7 %P 4102-4109 %8 2020-04-07 %D 2020 %R 10.1021/acs.est.9b07061 %K polymer %K nanoplastic %K microplastic photodegradation %K plastic weathering %Z Chemical Sciences/Analytical chemistryJournal articles %X Plastic pollution has become a worldwide concern. It was demonstrated that plastic breaks down to nanoscale particles in the environment, forming so-called nanoplastics. It is important to understand their ecological impact, but their structure is not elucidated. In this original work, we characterize the microstructure of oceanic polyethylene debris and compare them to the nonweathered objects. Cross-sections are analysed by several emergent mapping techniques. We highlight deep modifications of the debris within a layer a few hundred microns thick. The most 2 intense modifications are macromolecule oxidation and a considerable decrease in the molecular weight. The adsorption of organic pollutants and trace metals is also confined to this outer layer. Fragmentation of the oxidized layer of the plastic debris is the most likely source of nanoplastics. Consequently nanoplastic chemical nature differ greatly from plastics. %G English %2 https://hal.science/hal-02990067/document %2 https://hal.science/hal-02990067/file/Rowenczyketal_RevisedText_Clear.pdf %L hal-02990067 %U https://hal.science/hal-02990067 %~ IRD %~ MNHN %~ UNIV-TLSE3 %~ CNRS %~ UNIV-AMU %~ UNIV-LYON1 %~ INSA-TOULOUSE %~ L2C %~ UVSQ %~ INC-CNRS %~ UNIV-PARIS-SACLAY %~ MIPS %~ UNIV-MONTPELLIER %~ IPANEMA %~ INSA-GROUPE %~ LCE %~ UDL %~ UNIV-LYON %~ INRAE %~ TEST-HALCNRS %~ UVSQ-UPSACLAY %~ UNIVERSITE-PARIS-SACLAY %~ GS-ENGINEERING %~ GS-CHIMIE %~ GS-HUMANITIES-HERITAGE %~ GS-PHYSIQUE %~ INSTITUT-SCIENCES-LUMIERE %~ ALLIANCE-SU %~ TOULOUSE-INP %~ UNIV-UT3 %~ UT3-INP %~ FEDERATION-FERMAT %~ UT3-TOULOUSEINP %~ UM-2015-2021 %~ TEST3-HALCNRS %~ TEST4-HALCNRS %~ ICPO %~ TEST5-HALCNRS %~ INEE-CNRS %~ SOFTMAT