Ecotoxicity of nano-metal oxides: A case study on daphnia magna

Ecotoxicology
Monia Renzi, Andrea Blašković

Abstract

In Europe REACH framework directive imposes data acquisition concerning toxicity on acquatic species before the commercialization of chemicals to assess environmental risks. According to official methods, exposure tests are performed under in vitro and standardized conditions: OECD's guideline rules external variables such as water type, feeding conditions, and exposure time. As consequence, such obtained results could be different from effects observed in natural environments. This study collects effects within 24-96 h of exposure to nano metal-oxides (ZnO, TiO2) on D. magna obtained by the exposure under standard OECD conditions comparing them with results obtained by the exposure under more similar conditions to natural environment (i.e. mixture, feeding). High doses exposure determines gas-bubble disease. Animals exposed to LC10 actively ingest nanoparticles under both fasting and feeding conditions. Furthermore, body burial by a coat of nanoparticles thicker in mixtures than in single dispersions was recorded. Furthermore, results show that: (i) effects increase over time; (ii) n-ZnO results less effective than n-TiO2 in both single dispersion, and mixture; (iii) the presence of surfactant increases toxicity of nanoparticl...Continue Reading

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Citations

Jan 13, 2021·Nanomaterials·Tung X Trinh, Jongwoon Kim
Aug 28, 2021·International Journal of Environmental Research and Public Health·Elizabeth Oyinkansola OmotolaOlatunde Stephen Olatunji
Sep 2, 2021·Water Environment Research : a Research Publication of the Water Environment Federation·María Florencia GutierrezJimena Cazenave

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