title: Sequential studies of silver released from silver nanoparticles in aqueous media simulating sweat, laundry detergent solutions and surface water.
abstract: From an increased use of silver nanoparticles (Ag NPs) as an antibacterial in consumer products follows a need to assess the environmental interaction and fate of their possible dispersion and release of silver. This study aims to elucidate an exposure scenario of the Ag NPs potentially released from, for example, impregnated clothing by assessing the release of silver and changes in particle properties in sequential contact with synthetic sweat, laundry detergent solutions, and freshwater, simulating a possible transport path through different aquatic media. The release of ionic silver is addressed from a water chemical perspective, compared with important particle and surface characteristics. Released amounts of silver in the sequential exposures were significantly lower, approximately a factor of 2, than the sum of each separate exposure. Particle characteristics such as speciation (both of Ag ionic species and at the Ag NP surface) influenced the release of soluble silver species present on the surface, thereby increasing the total silver release in the separate exposures compared with sequential immersions. The particle stability had no drastic impact on the silver release as most of the Ag NPs were unstable in solution. The silver release was also influenced by a lower pH (increased release of silver), and cotransported zeolites (reduced silver in solution).
authors.affiliation: KTH Royal Institute of Technology, School of Chemical Science and Technology , Surface and Corrosion Science, SE-100 44 Stockholm, Sweden.
authors.forename: Jonas
authors.initials: J
authors.lastname: Hedberg
authors.forename: Sara
authors.initials: S
authors.lastname: Skoglund
authors.forename: Maria-Elisa
authors.initials: ME
authors.lastname: Karlsson
authors.forename: Susanna
authors.initials: S
authors.lastname: Wold
authors.forename: Inger
authors.initials: I
authors.lastname: Odnevall Wallinder
authors.forename: Yolanda
authors.initials: Y
authors.lastname: Hedberg
mesh_terms: D000327:Adsorption; D003902:Detergents / Q000737:chemistry*; D005374:Filtration; D005618:Fresh Water / Q000737:chemistry; D053768:Metal Nanoparticles / Q000737:chemistry*; D010316:Particle Size; D012834:Silver / Q000032:analysis*; D012995:Solubility; D012996:Solutions; D013010:Sonication; D013059:Spectrum Analysis, Raman; D013542:Sweat / Q000737:chemistry*; D014867:Water / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis; D017641:Zeolites / Q000737:chemistry
chemical_list: D003902:Detergents; D012996:Solutions; D014874:Water Pollutants, Chemical; D014867:Water; D017641:Zeolites; D012834:Silver