20.500.12556/RUL-144337 Monitoring of biofilm development and physico-chemical changes of floating microplastics at the air-water interface Microplastics in the aquatic environment serve as a habitat for microbial life, on which they can form biofilms. However, how the development of the biofilm alters the properties of floating microplastics that are at the air-water interface and, therefore, not fully submerged, is not well understood. In this context, an aging experiment was conducted to monitor biofilm formation and changes in physico-chemical properties of low-density polyethylene (floating) microplastics over time. The growth of the biofilm followed the typical bacterial/biofilm growth phases and reached about 30% of the total mass of the microplastics, while the concentration of extracellular polymeric substances within the biofilm remained stable. Presence of chlorophyll a and urease activity indicated presence of photosynthetic microorganisms within the biofilm which was also confirmed by analysis of the biofilm composition. Chemical characterization by FTIR showed the formation of additional functional groups attributed to the formed biofilm, and SEM imaging showed cracks on the surface of the aged microplastics, indicating incipient degradation of the polyethylene. Moreover, the adsorption capacity of the aged particles for metals (Pb(II)) was 52% higher compared to the pristine ones. Aging increased the density and size of the particles; however, it did not lead to the submersion of the aged particles even after 12 weeks of aging, suggesting that additional environmental processes may influence the transport of microplastics from the air-water interface into the water body. microplastics biofilm aging biodegradation biofouling polyethylene microbeads mikroplastika biofilm staranje biorazgradnja razvoj biofilma polietilen true false true Angleški jezik Slovenski jezik Članek v reviji 2023-02-15 09:47:05 2023-02-15 09:47:06 2023-09-01 04:00:52 0000-00-00 00:00:00 2023 0 0 9 str. art. 121157 Vol. 322 1 Apr. 2023 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 504.5: 678.742.2 0269-7491 10.1016/j.envpol.2023.121157 140570371 1-s2.0-S0269749123001598-main.pdf 1-s2.0-S0269749123001598-main.pdf 1 09B93F299E56638C327CC3E207FE759D 2c877cd26f246d1d7917d6e84c86bac85d2454ce629a14172e2ae5b38732844a 4085150d-ad0e-11ed-9c94-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=166600 https://www.sciencedirect.com/science/article/pii/S0269749123001598 1 fef694d3-ad0c-11ed-9c94-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=166599 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0