Chemical speciation of silver (Ag) in soils under aerobic and anaerobic conditions: Ag nanoparticles vs. ionic Ag

Yohey Hashimoto, Satoshi Takeuchi, Satoshi Mitsunobu, Yong Sik Ok

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)

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 languageEnglish
Pages (from-to)318-324
Number of pages7
JournalJournal of hazardous materials
Volume322
DOIs
Publication statusPublished - 2017 Jan 15
Externally publishedYes

Keywords

  • Chemical speciation
  • Nanomaterials
  • Redox
  • XAFS

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution
  • Health, Toxicology and Mutagenesis

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