Abstract
This study investigated how silver nanoparticles (AgNP) and ionic silver (AgNO 3 ) undergo phase-transformations in soils under aerobic and anaerobic conditions using extended X-ray absorption fine structure (EXAFS) spectroscopy. After 30 days of aerobic incubation, 88% of AgNP added to the soil remained persistent, whereas AgNO 3 was completely transformed into Ag associated with humus and clay minerals. In the anaerobic soil, 83% of the spiked AgNP was transformed into Ag 2 S, accompanied by significant decrease in water- and acid-extractable Ag fractions. About 50% of AgNO 3 spiked to the anaerobic soil underwent transformations into metallic Ag and associations with clay minerals. Oxide (Ag 2 O) and carbonate (Ag 2 CO 3 ) forms of Ag were not predominant in aerobic and anaerobic soils. The redox potential of soil had a profound effect on determination of the phase-transformation pathways for AgNP and ionic Ag.
Original language | English |
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Pages (from-to) | 318-324 |
Number of pages | 7 |
Journal | Journal of hazardous materials |
Volume | 322 |
DOIs | |
Publication status | Published - 2017 Jan 15 |
Externally published | Yes |
Keywords
- Chemical speciation
- Nanomaterials
- Redox
- XAFS
ASJC Scopus subject areas
- Environmental Engineering
- Environmental Chemistry
- Waste Management and Disposal
- Pollution
- Health, Toxicology and Mutagenesis