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 journalArticle

28 Citations (Scopus)

Abstract

This study investigated how silver nanoparticles (AgNP) and ionic silver (AgNO3) 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 AgNO3 was completely transformed into Ag associated with humus and clay minerals. In the anaerobic soil, 83% of the spiked AgNP was transformed into Ag2S, accompanied by significant decrease in water- and acid-extractable Ag fractions. About 50% of AgNO3 spiked to the anaerobic soil underwent transformations into metallic Ag and associations with clay minerals. Oxide (Ag2O) and carbonate (Ag2CO3) 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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