Sulfidation of silver nanoparticles: natural antidote to their toxicity.

Published

Journal Article

Nanomaterials are highly dynamic in biological and environmental media. A critical need for advancing environmental health and safety research for nanomaterials is to identify physical and chemical transformations that affect the nanomaterial properties and their toxicity. Silver nanoparticles, one of the most toxic and well-studied nanomaterials, readily react with sulfide to form Ag(0)/Ag2S core-shell particles. Here, we show that sulfidation decreased silver nanoparticle toxicity to four diverse types of aquatic and terrestrial eukaryotic organisms (Danio rerio (zebrafish), Fundulus heteroclitus (killifish), Caenorhabditis elegans (nematode worm), and the aquatic plant Lemna minuta (least duckweed)). Toxicity reduction, which was dramatic in killifish and duckweed even for low extents of sulfidation (about 2 mol % S), is primarily associated with a decrease in Ag(+) concentration after sulfidation due to the lower solubility of Ag2S relative to elemental Ag (Ag(0)). These results suggest that even partial sulfidation of AgNP will decrease the toxicity of AgNPs relative to their pristine counterparts. We also show that, for a given organism, the presence of chloride in the exposure media strongly affects the toxicity results by affecting Ag speciation. These results highlight the need to consider environmental transformations of NPs in assessing their toxicity to accurately portray their potential environmental risks.

Full Text

Duke Authors

Cited Authors

  • Levard, C; Hotze, EM; Colman, BP; Dale, AL; Truong, L; Yang, XY; Bone, AJ; Brown, GE; Tanguay, RL; Di Giulio, RT; Bernhardt, ES; Meyer, JN; Wiesner, MR; Lowry, GV

Published Date

  • January 2013

Published In

Volume / Issue

  • 47 / 23

Start / End Page

  • 13440 - 13448

PubMed ID

  • 24180218

Pubmed Central ID

  • 24180218

Electronic International Standard Serial Number (EISSN)

  • 1520-5851

International Standard Serial Number (ISSN)

  • 0013-936X

Digital Object Identifier (DOI)

  • 10.1021/es403527n

Language

  • eng