Publication
Reference
Pradas del Real Ana E., Castillo-Michel Hiram, Kaegi Ralf, Sinnet Brian, Magnin Valérie, Findling Nathaniel, Villanova Julie, Carrière Marie, Santaella Catherine, Fernández-Martı́nez Alejandro, Levard Clément, Sarret Géraldine (2016). Fate of Ag-NPs in Sewage Sludge after Application on Agricultural Soils. Environ. Sci. Technol., 50, 1759 - 1768.
Names
  • Ana E. Pradas del Real
  • Hiram Castillo-Michel
  • Ralf Kaegi
  • Brian Sinnet
  • Valérie Magnin
  • Nathaniel Findling
  • Julie Villanova
  • Marie Carrière
  • Catherine Santaella
  • Alejandro Fernández-Martı́nez
  • Clément Levard
  • Géraldine Sarret
Article and keywords
Title
Fate of Ag-NPs in Sewage Sludge after Application on Agricultural Soils
Abstract
The objective of this work was to investigate the fate of silver nanoparticles (Ag-NPs) in a sludge-amended soil cultivated with monocot (Wheat) and dicot (Rape) crop species. A pot experiment was performed with sludges produced in a pilot wastewater treatment plant containing realistic Ag concentrations (18 and 400 mg kg–1, 14 mg kg–1 for the control). Investigations focused on the highest dose treatment. X-ray absorption spectroscopy (XAS) showed that Ag2S was the main species in the sludge and amended soil before and after plant culture. The second most abundant species was an organic and/or amorphous Ag—S phase whose proportion slightly varied (from 24% to 36%) depending on the conditions. Micro and nano X-ray fluorescence (XRF) showed that Ag was preferentially associated with S-rich particles, including organic fragments, of the sludge and amended soils. Ag was distributed as heteroaggregates with soil components (size ranging from ≤0.5 to 1–3 μm) and as diffused zones likely corresponding to sorbed/complexed Ag species. Nano-XRF evidenced the presence of mixed metallic sulfides. Ag was weakly exchangeable and labile. However, micronutrient mobilization by plant roots and organic matter turnover may induce Ag species interconversion eventually leading to Ag release on longer time scales. Together, these data provide valuable information for risk assessment of sewage sludge application on agricultural soils.
Keywords
Ag, Nano-particles
Content
sample, spectral data, spectral data use
Year
2016
Journal
Environmental Science and Technology
Volume
50
Number
4
Pages
1759 - 1768
Document type
article
Publication state
published
Doi
10.1021/acs.est.5b04550
Identifiers
Experiment/Spectra