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Effects of silver nanoparticle properties, media pH and dissolved organic matter on toxicity to Daphnia magna.
Ecotoxicol Environ Saf. 2015 Jan; 111:263-70.EE

Abstract

Studies assessing the acute and chronic toxicity of silver nanoparticle (nAg) materials rarely consider potential implications of environmental variables. In order to increase our understanding in this respect, we investigated the acute and chronic effects of various nAg materials on Daphnia magna. Thereby, different nanoparticle size classes with a citrate coating (20-, ~30-, 60- as well as 100-nm nAg) and one size class without any coating (140 nm) were tested, considering at the same time two pH levels (6.5 and 8.0) as well as the absence or presence of dissolved organic matter (DOM; <0.1 or 8.0 mg total organic carbon/L). Results display a reduced toxicity of nAg in media with higher pH and the presence of DOM as well as increasing initial particle size, if similarly coated. This suggests that the associated fraction of Ag species <2 nm (including Ag(+)) is driving the nAg toxicity. This hypothesis is supported by normalizing the 48-h EC50-values to Ag species <2 nm, which displays comparable toxicity estimates for the majority of the nAg materials assessed. It may therefore be concluded that a combination of both the particle characteristics, i.e. its initial size and surface coating, and environmental factors trigger the toxicity of ion-releasing nanoparticles.

Authors+Show Affiliations

Institute for Environmental Sciences, Group of Ecotoxicology & Environment, University of Koblenz-Landau, Fortstrasse 7, 76829 Landau, Germany. Electronic address: seitz-f@uni-landau.de.Institute for Environmental Sciences, Group of Ecotoxicology & Environment, University of Koblenz-Landau, Fortstrasse 7, 76829 Landau, Germany.Institute for Environmental Sciences, Group of Ecotoxicology & Environment, University of Koblenz-Landau, Fortstrasse 7, 76829 Landau, Germany.Institute for Environmental Sciences, Group of Environmental and Soil Chemistry, University of Koblenz-Landau, Fortstrasse 7, 76829 Landau, Germany.Institute for Environmental Sciences, Group of Environmental and Soil Chemistry, University of Koblenz-Landau, Fortstrasse 7, 76829 Landau, Germany.Institute for Environmental Sciences, Group of Ecotoxicology & Environment, University of Koblenz-Landau, Fortstrasse 7, 76829 Landau, Germany.Institute for Environmental Sciences, Group of Ecotoxicology & Environment, University of Koblenz-Landau, Fortstrasse 7, 76829 Landau, Germany; Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences, Lennart Hjelms Väg 9, 75007 Uppsala, Sweden.

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

25450943

Citation

Seitz, Frank, et al. "Effects of Silver Nanoparticle Properties, Media pH and Dissolved Organic Matter On Toxicity to Daphnia Magna." Ecotoxicology and Environmental Safety, vol. 111, 2015, pp. 263-70.
Seitz F, Rosenfeldt RR, Storm K, et al. Effects of silver nanoparticle properties, media pH and dissolved organic matter on toxicity to Daphnia magna. Ecotoxicol Environ Saf. 2015;111:263-70.
Seitz, F., Rosenfeldt, R. R., Storm, K., Metreveli, G., Schaumann, G. E., Schulz, R., & Bundschuh, M. (2015). Effects of silver nanoparticle properties, media pH and dissolved organic matter on toxicity to Daphnia magna. Ecotoxicology and Environmental Safety, 111, 263-70. https://doi.org/10.1016/j.ecoenv.2014.09.031
Seitz F, et al. Effects of Silver Nanoparticle Properties, Media pH and Dissolved Organic Matter On Toxicity to Daphnia Magna. Ecotoxicol Environ Saf. 2015;111:263-70. PubMed PMID: 25450943.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effects of silver nanoparticle properties, media pH and dissolved organic matter on toxicity to Daphnia magna. AU - Seitz,Frank, AU - Rosenfeldt,Ricki R, AU - Storm,Katharina, AU - Metreveli,George, AU - Schaumann,Gabriele E, AU - Schulz,Ralf, AU - Bundschuh,Mirco, Y1 - 2014/11/05/ PY - 2014/07/10/received PY - 2014/09/26/revised PY - 2014/09/30/accepted PY - 2014/12/3/entrez PY - 2014/12/3/pubmed PY - 2015/7/28/medline KW - Acute toxicity KW - Crustacean KW - Environmental conditions KW - Nanomaterial KW - Silver SP - 263 EP - 70 JF - Ecotoxicology and environmental safety JO - Ecotoxicol Environ Saf VL - 111 N2 - Studies assessing the acute and chronic toxicity of silver nanoparticle (nAg) materials rarely consider potential implications of environmental variables. In order to increase our understanding in this respect, we investigated the acute and chronic effects of various nAg materials on Daphnia magna. Thereby, different nanoparticle size classes with a citrate coating (20-, ~30-, 60- as well as 100-nm nAg) and one size class without any coating (140 nm) were tested, considering at the same time two pH levels (6.5 and 8.0) as well as the absence or presence of dissolved organic matter (DOM; <0.1 or 8.0 mg total organic carbon/L). Results display a reduced toxicity of nAg in media with higher pH and the presence of DOM as well as increasing initial particle size, if similarly coated. This suggests that the associated fraction of Ag species <2 nm (including Ag(+)) is driving the nAg toxicity. This hypothesis is supported by normalizing the 48-h EC50-values to Ag species <2 nm, which displays comparable toxicity estimates for the majority of the nAg materials assessed. It may therefore be concluded that a combination of both the particle characteristics, i.e. its initial size and surface coating, and environmental factors trigger the toxicity of ion-releasing nanoparticles. SN - 1090-2414 UR - https://www.unboundmedicine.com/medline/citation/25450943/Effects_of_silver_nanoparticle_properties_media_pH_and_dissolved_organic_matter_on_toxicity_to_Daphnia_magna_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0147-6513(14)00457-6 DB - PRIME DP - Unbound Medicine ER -