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Investigation of interaction between pesticides and microplastic particles
Original title: Investigation of interaction between pesticides and microplastic particles
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This Croatian-language study investigated the influence of temperature and aging on the adsorption of the pesticide simazine onto PET microplastic particles (10–100 µm), using both unaged and UV-aged (56-day) samples. Adsorption kinetics were tracked by HPLC, and the individual and combined toxicity of microplastics and simazine were evaluated using standard acute toxicity tests on green microalgae. The study provides insight into how weathered plastic surfaces interact with pesticide contaminants and their combined environmental risks.
Onečišćenje mora plastičnim otpadom jedan je od najhitnijih globalnih problema morskog okoliša u cijelom svijetu. Privukao je svjetsku pozornost vlada, javnosti, znanstvene zajednice, medija i nevladinih organizacija te je postao vruća tema u aktualnoj morskoj ekologiji i istraživanju okoliša. Cilj ovog rada bio je istražiti utjecaj temperature i starosti mikroplastike poli(etilen- tereftalata) (PET) na adsorpciju pesticida simazina (SMZ). Korištene su čestice mikroplastike (10-100 μm) pripremljene iz nestarenih filmova PET-a te filmova podvrgnutim ubrzanom starenju 56 dana pod UV zračenjem. Nakon usitnjavanja u kriomlinu određena je raspodjela veličina čestica mikroplastike, pri čemu su za razdvajanje frakcija korišteni vibrirajuća tresilica sa sitima i laboratorijsko sito sa zračnim mlazom. Adsorpcijski eksperimenti provedeni su korištenjem termostatirane laboratorijske tresilice, a promjene koncentracije simazina praćene su tekućinskom kromatografijom visoke djelotvornosti (HPLC). Na kraju su ispitani pojedinačni štetni učinci mikroplastike i simazina te ukupni učinci mikroplastike s adsorbiranim onečišćivalom, provedbom standardnih testova akutne toksičnosti na zelene mikroalge Pseudokirchneriella subcapitata (ISO 8692). Rezultati ATR-FTIR spektroskopijesu pokazali da se UV starenjem povećava udio manjih frakcija čestica mikroplastike, što znači da je zbog utjecaja starenja materijal više podložan fragmentaciji, te je došlo do oksidativne razgradnje koja rezultira stvaranjem funkcionalnih skupina koje sadrže kisik (smanjena hidrofobnost materijala). Rezultati adsorpcije simazina slijede Langmuirovom model što ukazuje na adsorpciju u monosloju te je raspodjela aktivnih mjesta na adsorbensu homogena. Adsorpcija je izraženija u slučaju starenih uzoraka u odnosu na uzorke mikroplastike koji nisu stareni, te je najveća adsorpcija simazina postignuta uz PET 56 pri temperaturi od 20°C. Ispitivanje toksičnosti na zelenim mikroalgama Pseudokirchneriella subcapitata pokazalo je najveću toksičnost kod kombiniranih uzoraka simazina sa starenom mikroplastikom (PET 56) i CaCl2.
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Investigation of interaction between pharmaceuticals and microplastic particles
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This Croatian-language study investigated the adsorption of the pharmaceutical carbamazepine onto PET microplastic particles, comparing unaged and UV-aged samples after 56 days of accelerated weathering. UV aging increased the proportion of smaller particle fractions, and the combined toxicity of microplastics with adsorbed pharmaceuticals was assessed using acute toxicity tests on green microalgae (Pseudokirchneriella subcapitata). Results indicate that weathering of plastics can enhance their capacity to carry and potentially amplify the environmental toxicity of pharmaceutical pollutants.
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This Croatian-language study examined the adsorption of organic pollutants—including pharmaceuticals and pesticides—onto weathered polyethylene microplastics. UV aging was shown to alter the physical and chemical surface properties of PE, changing its adsorption capacity and potentially increasing its environmental hazard. The work contributes to understanding how plastic weathering in natural environments affects the transport and bioavailability of co-occurring chemical contaminants.
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This Croatian thesis reviews the interactions between microplastics and pesticides in aquatic environments, examining how microplastics can adsorb and transport pesticide contaminants. The author discusses combined toxicity effects and the environmental implications of this co-contamination.
Interaction of Microplastics with Emerging Organic Pollutants: A Study on Atrazine Adsorption and Phytotoxicity
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Researchers studied how aged and pristine polyethylene microplastics adsorb the herbicide atrazine and whether this combination affects plant seed germination. Aged microplastics absorbed significantly more atrazine than new ones due to surface changes from UV exposure, and the atrazine-loaded aged particles inhibited lettuce germination by up to 34%. The findings suggest that weathered microplastics in agricultural environments may amplify the harmful effects of pesticide contamination.
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Researchers systematically explored how the pesticide atrazine adsorbs onto both pristine and aged microplastics in aquatic environments. The study found that aged microplastics had higher adsorption capacities than pristine ones, with the aging process and pH significantly affecting surface charge and adsorption behavior, suggesting that weathered microplastics may carry greater loads of chemical contaminants.
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