Effects of four different nanocrystalline CeO2-based catalysts on crustaceans Daphnia magna and early-life stages of zebrafish Danio rerio were studied. Pure CeO2 and CuO-CeO2 mixed oxides with a nominal 10, 15 and 20 mol. % CuO content were tested. Pure CeO2 provoked no effects, but CuO-CeO2 mixed oxides induced some sublethal effects on fish and affected daphnidsć 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. Daphnidsćsurvival 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
COBISS.SI-ID: 4936474
There is still a lack of knowledge concerning bioaccumulation of nanoparticles. This paper is the first one to describe the accumulation of metal depending on its source, such as uncoated and unmodified ZnO nanoparticles, ZnCl2 in solution, and macropowder ZnO. The bioaccumulation was studied in a model terrestrial invertebrate, known to accumulate large proportions of metals. The bioaccumulation potential of Zn was found to be the same regardless of Zn source and depends most probably on Zn dissolution from ZnO particles and not on bioaccumulation of particulate ZnO.
COBISS.SI-ID: 6065785
In the current work, we used a test system with terrestrial isopods (Porcelio scaber) to investigate the fate of Cu nanoparticles (CuNPs) inside the organism. The animals were fed with food spiked with Cu NPs or soluble Cu salt for 14 days (2000 and 5000 μg Cu/g dry food). Cu content was analysed in the digestive glands, gut and the ‘rest’ of the body. Similar patterns of (i) assimilated and depurated amounts of Cu, (ii) Cu body distribution, and (iii) effect on isopods feeding behaviour were observed regardless if the animals were fed with Cu NPs or soluble Cu salt spiked food. Thus, Cu ions and not CuO NPs were assimilated by the digestive gland cells. The comparison of the in vitro data on solubilisation of Cu NPs and in vivo data on Cu accumulation in the animal tissues showed that about 99% of accumulated copper ions was dissolved from ingested Cu NPs in the digestive system of isopods.
COBISS.SI-ID: 2658127
This paper presents an exhaustive literature review and discussion of data on the effect of nanoparticulate TiO2 on different test organisms with the aim to identify the characteristics of the nanoparticles that have most biological significance. The nanotoxicity data from a number of studies fail to reveal the characteristics actually responsible for their biological reactivity because reported nanotoxicity studies rarely carry information on the physicochemical characteristics of the nanoparticles tested. This work served as a preliminary step in setting up experimental system used in our project. The information gained based on this data analysis was a basis for reliable and quality experimental data.
COBISS.SI-ID: 6536057