Journal article

Publication year: 2016

Pages: 2018-2023

Journal: Chemosphere

Volume number: 144

ISSN: 1879-1298

Open access status: Hybrid

DOI Link: https://doi.org/10.1016/j.chemosphere.2015.10.101

Publisher: Elsevier

Abstract: 
The OECD guidance document No. 29 was designed to determine the rate and extend to which metals can produce soluble available ionic metal species. This transformation/dissolution protocol was applied to silver nanomaterials. The results prove that concentrations of released Ag+ at pH 8 were nearly similar at all three different loadings. At pH 6, the concentration of Ag+ was almost the same at loadings of 10 and 100 mg L-1 AgNPs. However, the study showed changes in concentrations of nanoparticles and aggregates (operationally defined as the fraction passing a 0.2 pm filter). At the higher pH both the concentrations in the test medium of Ag+ and of AgNPs (fraction < 0.2 mu m) decreased. After 7 days of test duration, 71 mu g L-1 of Ag+ was found in pH 6 medium (initial loading of 100 mg L-1). In pH 8 medium a maximum concentration of 29 mu g L-1 Ag+ was measured (initial loading of 10 mg L-1). The maximum transformation from AgNPs to Ag+ was 2.7% (27 mu g L-1) in pH 8 medium (loading of 1 mg L-1) after 7 days. At an initial loading of 100 mg L-1 AgNPs in medium at pH 8, only 0.03% (30 mu g L-1) were transformed to Ag+ after 7 days. At the loading of 1 mg L-1 AgNPs all silver concentrations remain relatively constant for the duration of the test after 7 until 28 days. The results reveal that only low concentrations of Ag+ are released from AgNPs under the applied conditions. (C) 2015 The Authors. Published by Elsevier Ltd.

Harvard Citation style: Wasmuth, C., Rüdel, H., Düring, R. and Klawonn, T. (2016) Assessing the suitability of the OECD 29 guidance document to investigate the transformation and dissolution of silver nanoparticles in aqueous media, Chemosphere, 144, pp. 2018-2023. https://doi.org/10.1016/j.chemosphere.2015.10.101

APA Citation style: Wasmuth, C., Rüdel, H., Düring, R., & Klawonn, T. (2016). Assessing the suitability of the OECD 29 guidance document to investigate the transformation and dissolution of silver nanoparticles in aqueous media. Chemosphere. 144, 2018-2023. https://doi.org/10.1016/j.chemosphere.2015.10.101