New synthesized nanoparticles (Fe2O3 1A, ZnO – G18 and ZnFeO) – influence on Daphnia magna (Straus, 1820)

Elena Nenova1, Lilia Yordanova2 and Iliana Ivanova2
1 Sofia University Saint Kliment Ohridski, Faculty of Biology, Department of zoology and anthropology, 8 Dragan Tzankov blvd., 1164 Sofia, Bulgaria
2 Sofia University Saint Kliment Ochridski, Faculty of Biology, Department of general and industrial microbiology, 8 Dragan Tzankov blvd., 1164 Sofia, Bulgaria

Abstract

Nenova, E., Yordanova, L. & Ivanova, I. (2024). New synthesized nanoparticles (Fe2O3 1A, ZnO – G18 and ZnFeO) – influence on Daphnia magna (Straus, 1820). Bulg. J. Agric. Sci., 30 (Supplement 1), 107–111

Daphnia magna (Straus, 1820), a small species of water fleas with a short life cycle and high sensitivity to water pollution, is model used as a keystone species in eco-toxicological experiments in freshwater ecosystems to assess the biological effect of new synthesized nanoparticles on the environment.
Preliminary studies were conducted with Daphnia magna (Crustacea, Cladocera) and three types of nanoparticles: Fe2O3-1A, ZnO-G18 and ZnFeO. The preliminary results showed high toxicity and mortality in daphnia treated with Fe2O3 1A and ZnO-G18 and low toxicity and mortality of daphnia treated with ZnFeO nanoparticles. The ferrite nanoparticles (Fe2O3-1A) obtained by physical means were toxic to D. magna at concentrations of 0.5 mg L-1. For ZnO-G18 a concentration of 0. 5 mg L-1 killed 90% of daphnia at 48 h and a concentration of 0.05 mg L-1  it killed 70% of daphnia. The treatment with ZnFeO nanoparticles demonstrated a weaker effect on daphnia. Survival was 100% at a concentration of 0.02 mg L-1 and 90% at a concentration of 0.2 mg L-1.

Keywords: ecotoxicology; nanoparticles; water crustaceans

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