Influence of nanoplastic surface charge on eco-corona formation, aggregation and toxicity to freshwater zooplankton

Article Article scientifique Article Influence of nanoplastic surface charge on eco-corona formation, aggregation and toxicity to freshwater zooplankton eng 2019 author Saavedra Vargas Juan 819408 author Stoll Serge 0000-0003-3158-4208 29148 author Slaveykova Vera 0000-0002-8361-2509 510054 715-722 10.1016/j.envpol.2019.05.135 0269-7491 https://linkinghub.elsevier.com/retrieve/pii/S0269749119302799 Concerns about possible environmental implications of nano- and micro-plastics are continuously raising. Hence, comprehensive understanding of their behaviour, bioaccumulation and toxicity potential is required. Nevertheless, systematic studies on their fate and possible effects in freshwaters, as well as the influence of particle-specific and environmental factors on their behaviour and impacts are still missing. The aims of the present study are thus two-fold: (i) to examine the role of the surface charge on nanoplastic stability and acute effects to freshwater zooplankton; (ii) to decipher the influence of the refractory natural organic matter (NOM) on the nanoplastic fate and effects. Amidine and carboxyl-stabilized polystyrene (PS) spheres of 200 nm diameter characterized by opposite primary surface charges and neutral buoyancy were selected as model nanoplastics. The results demonstrated that the surface functionalization of the polystyrene nanoplastics controls their aggregation behaviour. Alginate or Suwannee River humic acid (SRHA) modified significantly the surface charge of positively-charged amidine PS nanoplastic and the aggregation state, while had no significant influence on the negatively-charged carboxyl PS nanoplastic. Both amidine and carboxyl PS nanoplastics were ingested by the zooplankton and concentrated mainly in the gut of water flea Daphnia magna and larvae Thamnocephalus platyurus, and the stomach of rotifer Brachionus calyciflorus. Amidine PS nanoplastic was more toxic than carboxyl one. The toxicity decreased in the order D. magna (48 h -immobilization) > B. calyciflorus (24 h - lethality) > T. platyurus (24 h - lethality). Alginate or SRHA reduced significantly the toxicity of both amidine and carboxyl PS nanoplastics to the studied zooplankton representatives. The implications of this laboratory study findings to natural environment were discussed. Nanoplastics NOM Amidine Carboxyl Ecotoxicity D. magna B. calyciflorus T. platyurus Dewey 333.7-333.9 Dewey 550 18 Institut des sciences de l'environnement 0DB 41 Département F.-A. Forel des sciences de l'environnement et de l'eau 153 false 752 Environmental Biogeochemistry and Ecotoxicology 755 Environmental Physical Chemistry Environmental Pollution 252 9d176e71-b9e4-4652-9875-f51a9adc30a9 Article (Published version) Restricted 1-s2.0-S0269749119302799-main.pdf 2507863 application/pdf b28231ec-d02e-4ee5-929d-e8613da8a9bc Article (Accepted version) Public SaavedraAccepted.pdf 388466 application/pdf openAccess Centres et instituts / Institut des sciences de l'environnement Faculté des sciences / Section des sciences de la Terre et de l'Environnement / Département F.-A. Forel des sciences de l'environnement et de l'eau

Title	Published in	Access level	OA Policy	Year	Views	Downloads

Influence of nanoplastic surface charge on eco-corona formation, aggregation and toxicity to freshwater zooplankton	Environmental Pollution			2019	404	729

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Saavedra Vargas, Juan