title: Effects of four CeO2 nanocrystalline catalysts on early-life stages of zebrafish Danio rerio and crustacean Daphnia magna.
abstract: Effects of four different nanocrystalline CeO(2)-based catalysts on crustaceans Daphnia magna and early-life stages of zebrafish Danio rerio were studied. Pure CeO(2) and CuO-CeO(2) mixed oxides with a nominal 10, 15 and 20 mol.% CuO content were tested. Pure CeO(2) provoked no effects, but CuO-CeO(2) mixed oxides induced some sublethal effects on fish and affected daphnids' survival. The most pronounced effects were found on fish body growth, which was reduced at 10 mg/L in case of CuCe20 and 50 mg/L in cases of CuCe10 and CuCe15. Daphnids' survival was affected above 80 mg/L of CuCe20, while CuCe10 and CuCe15 did not affect daphnids. None of the materials was highly toxic to daphnids and fish in comparison to some other environmental pollutants. Differences in effects between the materials could not be explained by their specific physicochemical properties. This work indicates that more attention should be placed at potential toxicity of nanostructured materials, such as nanocrystalline mixed-oxides.
authors.affiliation: National Institute of Chemistry, Laboratory for Environmental Sciences and Engineering, Ljubljana, Slovenia. anita.jemec@ki.si
authors.forename: Anita
authors.initials: A
authors.lastname: Jemec
authors.forename: Petar
authors.initials: P
authors.lastname: Djinović
authors.forename: Tatjana
authors.initials: T
authors.lastname: Tišler
authors.forename: Albin
authors.initials: A
authors.lastname: Pintar
mesh_terms: D000818:Animals; D002384:Catalysis; D002563:Cerium / Q000737:chemistry / Q000633:toxicity*; D003621:Daphnia / Q000187:drug effects* / Q000196:embryology; D049329:Nanostructures; D015027:Zebrafish / Q000196:embryology*
chemical_list: D002563:Cerium; C030583:ceric oxide