Abstract
Aquatic toxicity of titanium dioxide nanoparticles (TiO2 NPs) to Daphnia magna was characterized using a completely stirred bioassay system intended to keep particles in suspension thereby maintaining a consistent exposure. The 48-h LC50 was 4.5 mg/L TiO2 NPs, whereas LC50 values for 7 and 14-days exposures were 2.7 and 1.9 mg/L, respectively. An exposure of 1.5 mg/L over a 21-days exposure resulted in significant reductions in fecundity. While reproduction was initially reduced in the 0.5 and 1.0 mg/L exposures, it recovered and was similar to the control by 21 days. For reproduction inhibition, NOEC was 1.0 mg/L. Exposure to 2.5 mg/L TiO2 NPs resulted in 40 % of the organisms failing to become gravid; all surviving organisms exposed to 5.0 mg/L failed to become gravid. The increased sensitivity was due to the refinement in the bioassay system that kept NP in suspension resulting in consistent exposure concentrations.
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This study was supported by the Research Program funded by the Seoul National University of Science and Technology.
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Kim, KT., Klaine, S.J. & Kim, S.D. Acute and Chronic Response of Daphnia magna Exposed to TiO2 Nanoparticles in Agitation System. Bull Environ Contam Toxicol 93, 456–460 (2014). https://doi.org/10.1007/s00128-014-1295-5
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DOI: https://doi.org/10.1007/s00128-014-1295-5