title: Partitioning of silver and chemical speciation of free Ag in soils amended with nanoparticles.
abstract: BACKGROUND
  Knowledge about silver nanoparticles in soils is limited even if soils are a critical pathway for their environmental fate. In this paper, speciation results have been acquired using a silver ion selective electrode in three different soils.
  
  
  RESULTS
  Soil organic matter and pH were the most important soil properties controlling the occurrence of silver ions in soils. In acidic soils, more free silver ions are available while in the presence of organic matter, ions were tightly bound in complexes. The evolution of the chemical speciation of the silver nanoparticles in soils was followed over six months.
  
  
  CONCLUSIONS
  During the first few hours, there appeared to be a strong sorption of the silver with soil ligands, whereas over time, silver ions were released, the final concentration being approximately 10 times higher than at the beginning. Ag release was associated with either the oxidation of the nanoparticles or a dissociation of adsorbed silver from the soil surfaces.
authors.affiliation: Department of Chemistry, University of Montreal, Succ, Centre-Ville, P,O, Box 6128, Montreal, QC, H3C 3J7, Canada. sebastien.sauve@umontreal.ca.
authors.forename: Rachel
authors.initials: R
authors.lastname: Benoit
authors.forename: Kevin J
authors.initials: KJ
authors.lastname: Wilkinson
authors.forename: Sébastien
authors.initials: S
authors.lastname: Sauvé